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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

(Mark One)

For the quarterly period ended March 31, 2005.

OR

For the transition period from              to             

Commission File Number 0-23441

POWER INTEGRATIONS, INC.

(Exact name of registrant as specified in its charter)

5245 Hellyer Avenue, San Jose, California 95138

(Address of principal executive offices) (Zip code)

(408) 414-9200

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    YES   x    NO  ¨

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act).    YES  x    NO  ¨

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

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POWER INTEGRATIONS, INC.

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PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

(In thousands)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(unaudited)

(In thousands, except per share amounts)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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POWER INTEGRATIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

(In thousands)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The condensed consolidated financial statements include the accounts of Power Integrations, Inc. or the Company, a Delaware corporation, and its wholly owned subsidiaries. Significant inter-company accounts and transactions have been eliminated.

While the financial information furnished is unaudited, the condensed consolidated financial statements included in this report reflect all adjustments (consisting only of normal recurring adjustments) which the Company considers necessary for the fair presentation of the results of operations for the interim periods covered and the financial condition of the Company at the date of the interim balance sheet. The results for interim periods are not necessarily indicative of the results for the entire year. Certain reclassifications were made to the prior year financial information to conform to the current period presentation. The condensed consolidated financial statements should be read in conjunction with the Power Integrations, Inc. consolidated financial statements and the notes thereto for the year ended December 31, 2004 included in its Form 10-K filed on March 16, 2005 with the Securities and Exchange Commission.

Cash and Cash Equivalents and Short-Term and Long-Term Investments

The Company considers cash invested in highly liquid financial instruments with a remaining maturity of three months or less at the date of purchase to be cash equivalents. Investments in highly liquid financial instruments with maturities greater than three months but not longer than twelve months from the balance sheet date are classified as short-term investments. Investments in highly liquid financial instruments with maturities greater than twelve months from the balance sheet date are classified as long-term investments. As of March 31, 2005, the Company’s short-term and long-term investments consisted of U.S. government backed securities, municipal bonds, corporate commercial paper and other high quality commercial securities, which were classified as held-to-maturity and were valued using the amortized cost method, which approximates fair market value.

Revenue Recognition

Revenues consist of sales to original equipment manufacturers, or OEMs, merchant power supply manufacturers and distributors. Shipping terms to international OEMs and merchant power supply manufacturers are delivered at frontier, which is commonly referred to as DAF. As such, title to the product passes to the customer when the shipment reaches the destination country and revenue is recognized upon the arrival of the Company’s product in that country. Sales to North American OEMs and merchant power supply manufacturers are recognized upon shipment (FOB-point of origin), as this is when the title is passed to the customer.

Sales to distributors are made under terms allowing certain rights of return and protection against subsequent price declines on the Company’s products held by the distributors. As a result of the Company’s distributor agreements, the Company defers the recognition of revenue and the costs of revenues derived from sales to distributors until such distributors resell the Company’s products to their customers. The Company determines the amounts to defer based on the level of actual inventory on hand at its distributors as well as inventory that is in transit to its distributors. The gross profit that is deferred as a result of this policy is reflected as “deferred income on sales to distributors” in the accompanying condensed consolidated balance sheet.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Expense related to employee ownership programs through stock options

The Company has elected to follow Accounting Principles Board Opinion (APB) No. 25, Accounting for Stock Issued to Employees, and related interpretations, in accounting for employee stock options rather than the alternative fair value accounting allowed by SFAS No. 123, Accounting for Stock Based Compensation. APB No. 25 provides that expense relative to the Company’s employee ownership programs through stock options is measured based on the intrinsic value of stock options granted on the date of the grant and the Company recognizes expense in its statement of income using the straight-line method over the vesting period for fixed awards. Under SFAS No. 123, the fair value of stock options at the date of grant is recognized in earnings over the vesting period of the options. Had expense related to employee ownership programs through the Company’s stock option plans been determined under a fair value method consistent with SFAS No. 123, Accounting for Stock Based Compensation, and related interpretations, the Company’s net income would have been reduced to the following pro forma amounts (in thousands, except per share information):

The fair value of stock options granted is established on the date of the grant using the Black-Scholes option-pricing model with the following weighted average assumptions:

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The fair value of employees’ stock purchase rights under the Company’s employee stock purchase plan was estimated using the Black-Scholes model with the following weighted average assumptions:

Common Stock

On October 20, 2004, the Company announced that its board of directors had authorized the repurchase of up to $40.0 million of the Company’s common stock. The board directed that the repurchases be made pursuant to Rule 10b5-1 of the Exchange Act. From the inception of the stock repurchase program in 2004 to March 31, 2005, a total of 1,660,000 shares were repurchased for approximately $31.9 million. The Company repurchased approximately 1.1 million shares for approximately $20.2 million during the three months ended March 31, 2005. At March 31, 2005, approximately $8.1 million was available to repurchase shares of the Company’s common stock pursuant to the stock repurchase program. The repurchase program may be suspended or discontinued at any time.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. On an on-going basis, the Company evaluates its estimates, including those related to revenue recognition and allowances for receivables and inventories. These estimates are based on historical facts and various other assumptions that the Company believes to be reasonable at the time the estimates are made.

Comprehensive Income

Comprehensive income for the Company consists of net income, plus the effect of foreign currency translation adjustments, which was not material for the three months ended March 31, 2005 and 2004. Accordingly, comprehensive income closely approximates actual net income.

Segment Reporting

The Company is organized and operates as one business segment - the design, development, manufacture and marketing of proprietary, high-voltage, analog integrated circuits for use primarily in the AC-to-DC and DC-to-DC power conversion markets. The Company’s chief operating decision maker, the Chief Executive Officer, reviews financial information presented on a consolidated basis for purposes of making operating decisions and assessing financial performance.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Inventories are stated at the lower of cost (first-in, first-out) or market and consist of the following (in thousands):

Customer Concentration

The Company’s end user base is highly concentrated and a relatively small number of OEMs, power supply merchants and distributors accounted for a significant portion of the Company’s net revenues. Ten customers accounted for approximately 69.4% and 72.3% of total net revenues for the three months ended March 31, 2005 and 2004, respectively.

The following customers accounted for more than 10% of total net revenues:

Customers A and B are distributors of the Company’s products and customer C is an OEM.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash investments and trade receivables. The Company has cash investment policies that limit cash investments to low risk investments. With respect to trade receivables, the Company performs ongoing credit evaluations of its customers’ financial condition and requires letters of credit whenever deemed necessary. Additionally, the Company establishes an allowance for doubtful accounts based upon factors surrounding the credit risk of specific customers, historical trends related to past losses and other relevant information. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. The Company does not have any off-balance sheet credit exposure related to its customers. As of March 31, 2005 and December 31, 2004, approximately 75.7% and 81.9% of accounts receivable, respectively, were concentrated with ten customers.

The following customers accounted for more than 10% of accounts receivable:

Customers A and B are distributors of the Company’s products.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Export Sales

The Company markets its products in North America and in foreign countries through its sales personnel and a worldwide network of independent sales representatives and distributors. As a percentage of total net revenues, export sales, which consist of domestic sales to customers in foreign countries, are comprised of the following:

Product Sales

Sales of the Company’s TOPSwitch and TinySwitch products accounted for 95.8% and 97.3% of net revenues from product sales for the three months ended March 31, 2005 and 2004, respectively. TOPSwitch products include TOPSwitch, TOPSwitch II, TOPSwitch FX and TOPSwitch GX. TinySwitch products include TinySwitch and TinySwitch II.

Basic earnings per share are calculated by dividing net income by the weighted average shares of common stock outstanding during the period. Diluted earnings per share are calculated by dividing net income by the weighted average shares of common stock and dilutive common equivalent shares outstanding during the period. Dilutive common equivalent shares included in the diluted calculation consists of dilutive shares issuable upon the exercise of outstanding common stock options and warrants computed using the treasury stock method.

A summary of the earnings per share calculation is as follows (in thousands, except per share amounts):

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Options to purchase 2,258,058 and 389,594 shares of common stock that were outstanding at March 31, 2005 and 2004, respectively, were not included in the computation of diluted earnings per share for the periods then ended because the options’ exercise price was greater than the average market price of the Company’s common stock during those periods, and therefore, their effect would have been antidilutive.

Income tax expense for the three-month periods ended March 31, 2005 and 2004 includes a provision for federal, state and foreign taxes based on the annual estimated effective tax rate applicable to the Company and its subsidiaries. The difference between the federal statutory rate of 35% and the Company’s effective tax rate used for the three-month period ended March 31, 2005 and 2004 was primarily due to the beneficial impact of international sales subject to lower tax rates and research and development credits. The Company’s estimated effective tax rate for the three months ended March 31, 2005 and 2004 was 26% and 28%, respectively.

The Company sells products to its distributors under contracts, collectively referred to as Distributor Sales Agreements (“DSA”). Each DSA contains the relevant terms of the contractual arrangement with the distributor, and generally includes certain provisions for indemnifying the distributor against losses, expenses, and liabilities from damages that may be awarded against the distributor in the event the Company’s hardware is found to infringe upon a patent, copyright, trademark, or other proprietary right of a third party (Customer Indemnification). The DSA generally limits the scope of and remedies for the Customer Indemnification obligations in a variety of industry-standard respects, including, but not limited to, limitations based on time and geography, and a right to replace an infringing product. The Company also, from time to time, has granted a specific indemnification to individual customers.

The Company believes its internal development processes and other policies and practices limit its exposure related to such indemnifications. In addition, the Company requires its employees to sign a proprietary information and inventions agreement, which assigns the rights to its employees’ development work to the Company. To date, the Company has not had to reimburse any of its distributors or customers for any losses related to these indemnifications and no material claims were outstanding as of March 31, 2005. For several reasons, including the lack of prior indemnification claims and the lack of a monetary liability limit for certain infringement cases, the Company cannot determine the maximum amount of potential future payments, if any, related to such indemnifications.

From time to time the Company could become involved in more lawsuits, or customers and distributors may make claims against the Company, which arise in the ordinary course of business. During 2004 a small number of product lots, of one of the Company’s products, were not built to design specifications as the result of a foundry process defect. As a result of this manufacturing defect, there were a limited number of product failures and the Company replaced all of the parts that had not yet been installed in end customer products. Several customers made requests for reimbursement of costs and expenses in excess of the Company’s contractual warranty liability. In accordance with SFAS No. 5, Accounting for Contingencies, the Company makes a provision for a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. In April 2005, after further discussions with customers, the Company determined that it was appropriate to accrue $270,000 as of March 31, 2005, for potential customer costs and expenses in excess of the Company’s contractual warranty liability.

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

On June 28, 2004, the Company filed a complaint for patent infringement in the U.S. District Court, Northern District of California, against System General Corporation, a Taiwanese company and its U.S. subsidiary. The Company’s complaint alleges that certain integrated circuits produced by System General Corporation infringed and continue to infringe certain of the Company’s patents. The Company seeks, among other things, an order enjoining System General Corporation from infringing the Company’s patents and an award for damages resulting from the alleged infringement.

On October 20, 2004, the Company filed a complaint for patent infringement in the U.S. District Court for the District of Delaware, against Fairchild Semiconductor International, Inc., a Delaware corporation, and Fairchild Semiconductor Corporation, a Delaware corporation (collectively, Fairchild). The Company’s complaint alleges that Fairchild produces certain integrated circuits, which infringed and continue to infringe certain of the Company’s patents. The Company seeks, among other things, an order enjoining Fairchild from infringing the Company’s patents and an award for damages resulting from the alleged infringement.

There can be no assurance that the Company will prevail in its litigation with either System General or Fairchild. This litigation, whether or not determined in the Company’s favor or settled by the Company, will be costly and will divert the efforts and attention of the Company’s management and technical personnel from normal business operations, which could have a material adverse effect on the Company’s business, financial condition and operating results. Adverse determinations in litigation could result in the loss of the Company’s proprietary rights, subject the Company to significant liabilities, require the Company to seek licenses from third parties or prevent the Company from licensing its technology, any of which could have a material adverse effect on the Company’s business, financial condition and operating results.

During the three months ended March 31, 2005, the Company made a change to its method of calculating deferred income on sales to distributors. This change resulted in the recognition of $1.1 million in previously deferred revenue, the recognition of $0.6 million of previously deferred costs, and an increase in net income of approximately $0.4 million, which represented diluted earnings per share of approximately $0.01. The impact of this adjustment was not material to any of the Company’s prior period financial statements.

In December 2004, the Financial Accounting Standards Board (FASB) issued Statement of Financial Accounting Standards (SFAS) No. 123 (revised 2004) Share-Based Payment (SFAS 123R), which replaces SFAS No. 123 Accounting for Stock-Based Compensation (SFAS 123) and supersedes APB Opinion No. 25 Accounting for Stock Issued to Employees. SFAS 123(R) requires all share-based payments to employees, including grants of employee stock options, to be recognized in the financial statements based on their fair values beginning with the first interim or annual period after December 31, 2005, (this date was changed from June 15, 2005, by the U.S. Securities and Exchange Commission (SEC) on April 14, 2005). The pro forma disclosures previously permitted under SFAS 123 no longer will be an alternative to financial statement recognition. Under SFAS 123(R), beginning January 1, 2006, the Company must determine the appropriate fair value model to be used for valuing share-based payments, the amortization method for compensation cost and the transition method to be used at the date of adoption. The transition methods include a modified-prospective and a modified-retroactive adoption options. Under the modified-retroactive option, prior periods may be restated either as of the beginning of the year of adoption or for all periods presented. The modified-prospective method requires that compensation expense be recorded for all unvested stock options and restricted stock at the beginning of the first quarter of adoption of SFAS 123(R), while the modified-retroactive methods would record compensation expense for all unvested stock options and restricted stock beginning with the first period restated. The Company is evaluating the requirements of SFAS 123(R), and expects that the adoption of SFAS 123(R) will have a material impact on its consolidated results of operations and earnings per share. The Company has not yet determined the

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POWER INTEGRATIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

method of adoption or the effect of adopting SFAS 123(R), and it has not been determined whether the adoption will result in amounts that are similar to the current pro forma disclosures under SFAS 123.

In March 2005, the SEC issued Staff Accounting Bulletin (SAB) 107, Share-Based Payment, which expresses views of the SEC staff regarding the application of SFAS No. 123(R). Among other things, SAB 107 provides interpretive guidance related to the interaction between SFAS No. 123(R) and certain SEC rules and regulations, as well as the SEC staff’s views regarding the valuation of share-based payment arrangements for public companies.

In March 2005, the FASB issued FSP No. 46(R)-5, Implicit Variable Interests under FASB Interpretation No. 46 (revised December 2003), Consolidation of Variable Interest Entities (FSP 46(R)-5), which provides guidance for a reporting enterprise on whether it holds an implicit variable interest in a variable interest entity (VIE) or potential VIE when specific conditions exist. FSP 46(R)-5 is effective the first period beginning after March 3, 2005. The Company is currently evaluating the effect that the adoption of FSP 46(R)-5 will have on the Company’s consolidated results of operations and financial condition but does not expect it to have a material impact.

In December 2004, the FASB issued FASB Staff Position No.109-1 (FAS 109-1), Application of FASB Statement No.109, Accounting for Income Taxes, to the Tax Deduction on Qualified Production Activities Provided by the American Jobs Creation Act of 2004 (the AJCA). The AJCA introduces a special 9% tax deduction on qualified production activities. FAS 109-1 clarifies that this tax deduction should be accounted for as a special tax deduction in accordance with Statement 109. The Company is currently evaluating the impact of FAS 109-1, however the Company does not believe it will have a material impact on the Company’s financial statements.

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This Management’s Discussion and Analysis of Financial Condition and Results of Operations includes a number of forward-looking statements, which reflect our current views with respect to future events and financial performance. In this report, the words “will”, “expects”, “believe”, “should”, “anticipate”, “if”, “future” and similar expressions identify forward-looking statements. Such statements are subject to certain risks and uncertainties, including our development efforts, the success of our product strategies, the maintenance of significant business relationships, as well as those discussed in the “Factors That May Affect Future Results of Operations” and elsewhere in this report. As a result of these risks, our actual results may differ materially from our historical or anticipated results. We caution you not to place undue reliance on these forward-looking statements, which speak only as of the date of this report.

The following management’s discussion and analysis of financial condition and results of operations should be read in conjunction with management’s discussion and analysis of financial condition and results of operations included in our Form 10-K for the year ended December 31, 2004.

Overview

We design, develop, manufacture and market proprietary, high-voltage, analog integrated circuits, commonly referred to as ICs, primarily for use in electronic power supplies, also known as switched-mode power supplies or switchers. Power supplies convert electricity from a source, such as a wall socket, to the power needed by an electronic device. This conversion entails, among other functions, reducing the voltage and, when necessary, converting alternating current to direct current (AC-DC). Switched-mode power supplies perform these functions using an array of electronic components, often including ICs such as ours. The vast majority of our ICs are used in AC-DC switchers, though we are now also targeting certain DC-DC applications. Our focus is on applications that are sensitive to size, portability, energy efficiency and time-to-market, which are the primary benefits that our ICs provide. We have targeted applications in the following markets for our ICs:

We believe our patented TOPSwitch ICs, introduced in 1994, were the first highly integrated power conversion ICs to achieve widespread market acceptance. Since the introduction of TOPSwitch, we have introduced a number of other families of ICs that further improve upon the functionality and cost-effectiveness of TOPSwitch, and enable us to address a wider range of applications. In June 2002, we further expanded our addressable market with the introduction of DPA-Switch, a highly integrated high-voltage DC-DC power conversion IC designed specifically for use in distributed power architectures. With our current portfolio, which also includes TinySwitch and LinkSwitch products, we can address applications requiring up to 290 watts of power, in AC-DC applications, and up to 100 watts of power in DC-DC applications.

Our quarterly operating results are volatile and difficult to predict. Our net revenues and operating results have varied significantly in the past, are difficult to forecast and are subject to numerous factors both within and outside of our control. As a result, our quarterly and annual operating results may fluctuate significantly in the future. For a discussion of the factors that may affect our quarterly and annual operating results, please see “Factors that May Affect Future Results of Operations.”

A portion of our cost of revenues consists of the cost of wafers. We currently purchase wafers from Matsushita Electric Industrial Co, Ltd. (Matsushita), OKI Electric Industry (OKI), and ZMD Analog Mixed Signal Services GmbH & CoKG (ZMD). The contract prices to purchase wafers from Matsushita and OKI are denominated in Japanese yen. The agreements with these vendors allow for mutual sharing of the impact of the exchange rate fluctuation between Japanese

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yen and the U.S. dollar. Nevertheless, changes in the exchange rate between the U.S. dollar and the Japanese yen subject our gross profit and operating results to the potential for material fluctuations. Our agreement to purchase wafers from ZMD is denominated in U.S. dollars, as are the purchases we make from our assembly and test suppliers.

Critical Accounting Policies and Estimates

Our critical accounting policies are as follows:

We believe that these policies and estimates are important to the portrayal of our financial condition and results and require us to make judgments and estimates about matters that are inherently uncertain. A brief description of these critical accounting policies is set forth below.

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, we evaluate our estimates, including those related to revenue recognition, sales returns, allowance for distributor pricing credits, bad debts and inventories. We base our estimates on historical facts and various other assumptions that we believe to be reasonable at the time the estimates are made. Actual results could differ from those estimates.

Revenue recognition

Product revenues consist of sales to OEMs, merchant power supply manufacturers and distributors. Shipping terms to international OEMs and merchant power supply manufacturers are delivered at frontier, which is commonly referred to as DAF. As such, title to the product passes to the customer when the shipment reaches the destination country, at which time we recognize the related revenue. Sales to North American OEMs and merchant power supply manufacturers are recognized upon shipment (FOB-point of origin), as this is when the title is passed to the customer.

Historically, approximately 50% to 60 % of our total sales have been made to distributors pursuant to agreements that allow certain rights of return and protection against subsequent price declines on our products held by these distributors. As a result, we defer the recognition of revenue and the costs of revenues derived from sales to distributors until such distributors resell our products to their customers. We determine the amounts to defer based on the level of actual inventory on hand at our distributors as well as inventory that is in transit to them. The gross profit that is deferred as a result of this policy is reflected as “deferred income on sales to distributors” in the accompanying condensed consolidated balance sheet.

Estimating sales returns and allowances

Net revenue consists of product revenue reduced by estimated sales returns and allowances. To estimate sales returns and allowances, we analyze, both when we initially establish the reserve and then each quarter when we review the adequacy of the reserve, the following factors: historical returns, current economic trends, levels of inventories of our products held by our customers, and changes in customer demand and acceptance of our products. This reserve represents a reserve of the gross margin on estimated future returns and is reflected as a reduction to accounts receivable in the accompanying condensed consolidated balance sheet. Increases to the reserve are recorded as a reduction to net revenue equal to the expected customer credit memo and a corresponding credit is made to cost of sales equal to the estimated cost of the returned product. The net difference, or gross margin, is recorded as an addition to the reserve. Because the reserve for sales returns and allowances is based on our judgments and estimates, particularly as to future customer demand and acceptance of our products, our reserves may not be adequate to cover actual sales returns and other allowances. If our reserves are not adequate, our future net revenues could be adversely affected.

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Estimating distributor pricing credits

Frequently, our distributors need a cost lower than the standard distribution price to win business. In these circumstances, the distributor submits a request to us for a lower “sell-in” price on a specific end-customer transaction or a series of transactions. After the distributor ships product to its customer under an approved transaction, the distributor submits a “ship & debit” claim to us to adjust its cost from the standard price to the approved lower price. After verification by us, a credit memo is issued to the distributor to adjust the sell-in price from the standard distribution price to the approved lower price. We maintain a reserve for these credits that appears as a reduction to accounts receivable in our accompanying condensed consolidated balance sheet. Any increase in the reserve results in a corresponding reduction in our net revenues. To establish the adequacy of our reserves, we analyze historical ship and debit amounts and levels of inventory in the distributor channels. If our reserves are not adequate, our net revenues could be adversely affected.

From time to time we will reduce the distribution list price of our products. When this occurs, we give our distributors price protection in the form of credits, on products they hold. The credits are referred to as “Price Protection”. Since we do not recognize revenue until the distributor sells the product to its customers, we generally do not need to provide reserves for price protection. However, in rare instances we must consider price protection in the analysis of reserve requirements, as there may be a timing gap between a price decline and the issuance of price protection credits. If a price protection reserve is required, we will maintain a reserve for these credits that appears as a reduction to accounts receivable in our accompanying condensed consolidated balance sheet. Any increase in the reserve results in a corresponding reduction in our net revenues. We analyze distribution price declines and levels of inventory in the distributor channels. If our reserves are not adequate, our net revenues could be adversely affected.

Estimating allowance for doubtful accounts

We maintain an allowance for losses we may incur as a result of our customers’ inability to make required payments. Any increase in the allowance results in a corresponding increase in our general and administrative expenses. In establishing this allowance, and then evaluating the adequacy of the allowance for doubtful accounts each quarter, we analyze historical bad debts, customer concentrations, customer credit-worthiness, current economic trends and changes in our customer payment terms. If the financial condition of one or more of our customers deteriorates, resulting in their inability to make payments, or if we otherwise underestimate the losses we incur as a result of our customers’ inability to pay us, we could be required to increase our allowance for doubtful accounts which could adversely affect our operating results.

Estimating reserve for excess and obsolete inventory

We identify excess and obsolete products and analyze historical usage, forecasted production based on demand forecasts, current economic trends, and historical write-offs when evaluating the adequacy of the reserve for excess and obsolete inventory. This reserve is reflected as a reduction to inventory in the accompanying condensed consolidated balance sheet, and an increase in cost of revenues. If actual market conditions are less favorable than our assumptions, we may be required to take additional reserves, which could adversely impact our cost of revenues and operating results.

Income taxes

We recognize federal, state and foreign current tax liabilities or assets based on our estimate of taxes payable or refundable in the current fiscal year by tax authorities. We also recognize federal, state and foreign deferred tax liabilities or assets for our estimate of future tax effects attributable to temporary differences and carry forwards and record a valuation allowance to reduce any deferred tax assets by the amount of any tax benefits that, based on available evidence and judgment, are not expected to be realized. As of March 31, 2005, no valuation allowance had been recorded to reduce our deferred tax assets. We believe it is more likely than not that forecasted income, including income that may be generated as a result of certain tax planning strategies, will be sufficient to fully recover our deferred tax assets. In the event that all or part of the net deferred tax assets are determined not to be realizable in the future, a valuation allowance would be recorded in the period such determination is made, which could adversely affect our operating results. In

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addition, the calculation of tax liabilities involves significant judgment in estimating the impact of uncertainties in the application of complex tax laws. Resolution of these uncertainties in a manner inconsistent with our expectations could have a material impact on our result of operations and financial position.

Results of Operations

The following table sets forth certain operating data as a percentage of total net revenues for the periods indicated.

Comparison of the Three Months Ended March 31, 2005 and 2004

Net revenues. Net revenues consist of revenues from product sales, which are calculated net of returns and allowances, plus license fees and royalties paid by Matsushita. Net revenues for the three months ended March 31, 2005 were $34.4 million compared to $34.2 million for the three months ended March 31, 2004, an increase of $200,000. During the three months ended March 31, 2005, the Company made a change to its method of calculating deferred income on sales to distributors. This change resulted in the recognition of $1.1 million in previously deferred revenue, the recognition of $0.6 million of previously deferred costs, and an increase in net income of approximately $0.4 million, which represented diluted earnings per share of approximately $0.01. The impact of this adjustment was not material to any of the Company’s prior period financial statements.

The increase in net revenues for the three months ended March 31, 2005 was primarily the result of the $1.1 million dollar adjustment to previously deferred revenue, which increased sales to distributors. Excluding this adjustment, net revenues decreased $800,000, primarily due to a reduction of sales to the communications end market.

Our net revenue mix by product family and by the end markets that we serve are as follows:

Revenue mix by product family for the three months ended March 31, 2005 compared to the twelve months ended December 31, 2004:

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Approximate revenue mix by end markets served for the three months ended March 31, 2005 compared to the twelve months ended December 31, 2004:

Customer demand for our products can change quickly and unexpectedly. Our customers perceive that our products are readily available and typically order only for their short-term needs. Our revenue levels are highly dependent on the amount of new orders that are received for which product can be delivered by us within the same period. Orders that are booked and shipped within the same period are called “turns business”. Because of the uncertainty of customer demand, and the short lead-time environment and high turns business, it is difficult to predict future levels of revenues and profitability.

International sales, which are based on “ship to” customer locations, were $31.2 million in the first quarter of 2005 compared to $31.4 million for the same period in 2004, a decrease of approximately $200,000. International sales represented 90.6% of net revenues compared to 91.8% in the comparable period of 2004. In absolute dollars, the decrease in our international sales for the three months ended March 31, 2005 was primarily from decreased sales of our products in the communication end market. The decrease was partially offset by increased sales in the computer end markets. Although the power supplies using our products are designed and distributed to end markets worldwide, most of these power supplies are manufactured in Asia. As a result, sales to this region were 76.9% and 78.5% of our net revenues for the three months ended March 31, 2005 and 2004, respectively. We expect international sales to continue to account for a large portion of our net revenues.

Net product sales for the first quarter of 2005 were divided 58% to distributors and 42 % to OEMs and power supply merchants, compared to 56% to distributors and 44% to OEMs and power supply merchants for the first quarter of 2004. In the three months ended March 31, 2005, two separate customers, both of whom are distributors, accounted for approximately 18% and 15% of net revenues. In the three months ended March 31, 2004, the same two distributors accounted for approximately 22% and 15% of net revenues, and one other customer, an OEM, accounted for approximately 13% of net revenues.

Cost of revenues; Gross profit. Gross profit is equal to net revenues less cost of revenues. Our cost of revenues consists primarily of costs associated with the purchase of wafers from Matsushita, OKI and ZMD, the assembly and packaging of our products by sub-contractors, internal labor and overhead associated with the testing of both wafers and packaged components and testing of packaged components by sub-contractors. Gross profit was $16.6 million, or 48.3% of net revenues, for the three months ended March 31, 2005, compared to $16.7 million, or 48.9% of net revenues, for the three months ended March 31, 2004. Our gross margin was relatively flat for the three months ended March 31, 2005 compared to the same period in 2004 despite generally declining prices, primarily because of our ability to improve our process technology and reduce our test costs through time test improvements and the increased amount of testing performed by third parties off-shore.

Research and development expenses. Research and development expenses consist primarily of employee-related expenses, expensed engineering material and facility costs associated with the development of new processes and new products. We also expense prototype wafers and mask sets related to new products as research and development costs until new products are released to production. Research and development expenses for the first quarter of 2005 were $4.1 million compared to $4.2 million for the same period in 2004, which represented 11.9% and 12.2% of our net revenues in each period, respectively. In absolute dollars, research and development expenses for the first quarter in 2005 were relatively flat compared to the same period in 2004. We expect research and development expenses to increase in absolute dollars, but those expenses may fluctuate as a percentage of our net revenues.

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Sales and marketing expenses. Sales and marketing expenses consist primarily of employee-related expenses, commissions to sales representatives, field application engineering costs, and facilities expenses, including expenses associated with our regional sales offices and support offices. Sales and marketing expenses were $4.0 million, or 11.7% of net revenues, for the first quarter of 2005, compared to $4.1 million, or 12.0% of net revenues for the same period in 2004. In absolute dollars, sales and marketing expenses for the first quarter in 2005 were relatively flat compared to the same period in 2004. We expect sales and marketing expenses to increase in absolute dollars as we continue to expand our sales and marketing presence worldwide, but may fluctuate as a percentage of our net revenues.

General and administrative expenses. General and administrative expenses consist primarily of employee-related expenses for administration, finance, human resources and general management, as well as consulting fees, outside services, legal fees and audit and tax services. For the quarter ended March 31, 2005, general and administrative expenses were $2.8 million or 8.1%, of our net revenues, compared to $1.6 million, or 4.6% of net revenues for the same period in 2004. The increase was due primarily to increased professional services incurred to comply with the requirements of the Sarbanes-Oxley Act, and legal fees related to the ongoing patent infringement lawsuits against System General Corporation and Fairchild Semiconductor (as described in Part II Other Information, Item 1 Legal Proceedings). We expect general and administrative expenses to increase in absolute dollars generally throughout 2005, primarily as a result of increased patent litigation expenses, but general and administrative expenses may fluctuate as a percentage of our net revenues.

Other income, net. Other income, net, for the first quarter of 2005 was $654,000 compared to $259,000 for the same period in 2004. Other income consists primarily of interest income earned on short-term and long-term investments. The increase of $395,000 was primarily from increased interest income due to higher interest rates. The weighted average interest rate for our investment portfolio in the three months ended March 31, 2005 was 2.82% compared to 1.41% for the same period in 2004, an increase of 1.41%.

Provision for income taxes. Provision for income taxes represents federal, state and foreign taxes. The provision for income taxes was $1.7 million for the quarter ended March 31, 2005 compared to $2.0 million for the quarter ended March 31, 2004. Our estimated effective tax rate used for the three months ended March 31, 2005 and 2004 was 26% and 28% respectively. The difference between the statutory rate of 35% and our effective tax rate for the quarter ended March 31, 2005 and 2004 was due primarily to the favorable effects of research and development tax credits and international sales subject to lower tax rates. We expect our effective tax rate to remain at approximately 26% for 2005. We believe our effective tax rate will decline over time if we are able to grow our international business.

Liquidity and Capital Resources

As of March 31, 2005, we had approximately $122.7 million in cash, cash equivalents and short-term and long-term investments, a decrease of approximately $11.9 million from December 31, 2004. In addition, under a revolving line of credit with Union Bank of California, we can borrow up to $10.0 million. A portion of the credit line is used to cover advances for commercial letters of credit and standby letters of credit, which we provide to Matsushita, prior to the shipment of wafers by our foundry to us, and also to our workers compensation insurance carrier as part of our insurance program. As of March 31, 2005, there were outstanding letters of credit totaling approximately $2.3 million. The balance of this credit line was unused and available as of March 31, 2005. The line of credit agreement, which expires on June 30, 2006, contains financial covenants requiring that we maintain profitability on a quarterly basis and not pay or declare dividends without the bank’s prior consent. As of March 31, 2005, we were in compliance with these financial covenants.

As of March 31, 2005, we had working capital, defined as current assets less current liabilities, of approximately $132.9 million, a decrease of approximately $10.6 million from December 31, 2004. Our operating activities generated cash of $6.4 million and $5.1 million in the three months ended March 31, 2005 and 2004, respectively. Cash generated in the first three months of 2005 was principally the result of net income in the amount of $4.7 million, depreciation and amortization of $1.7 million, a decrease in accounts receivable, and prepaid expenses and other current assets of $2.0 million and $1.2 million respectively, partially offset by an increase in inventory of $1.4 million and a decrease in accounts payable of $1.3 million. Cash generated in the first three months of 2004 was principally the result of net

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income in the amount of $5.1 million, depreciation and amortization of $1.8 million, the tax benefit associated with employee stock plans of $1.4 million and a decrease in inventory of $1.8 million, partially offset by an increase in accounts receivable of $3.1 million and decreases in accounts payable of $1.2 million and taxes payable and other accrued liabilities of $1.4 million.

Our investing activities were net purchases of $2.7 million and $7.4 million in the three months ended March 31, 2005 and 2004, respectively, of short-term and long-term investments. Purchases of property and equipment were $509,000 and $1.4 million in the three months ended March 31, 2005 and 2004, respectively. Our financing activities for the three months ended March 31, 2005 included the use of $20.2 million for the repurchase of approximately 1.1 million shares of our common stock, and receipts of $2.5 million from the issuance of common stock through the exercise of stock options and purchases through our employee stock purchase plan. Our financing activities in the three months ended March 31, 2004 were primarily receipts from the issuance of common stock through the exercise of stock options and purchases through our employee stock purchase plan of $4.4 million.

On October 20, 2004, we announced that our board of directors had authorized the repurchase of up to $40.0 million of our common stock. The board directed that the repurchases be made pursuant to Rule 10b5-1 of the Exchange Act. From the inception of the stock repurchase program in 2004 to March 31, 2005, a total of 1,660,000 shares were repurchased for approximately $31.9 million. We repurchased approximately 1.1 million shares for approximately $20.2 million during the three months ended March 31, 2005. The repurchase program may be suspended or discontinued at any time.

During the first three months of 2005, a significant portion of our cash flow was generated by our operations. If our operating results deteriorate during the remainder of 2005, as a result of decrease in customer demand, or severe pricing pressures from our customers or our competitors, or for other reasons, our ability to generate positive cash flow from operations may be jeopardized. In that case, we may be forced to use our cash, cash equivalents and short-term investments, or seek financing from third parties to fund our operations. We believe that cash generated from operations, together with existing sources of liquidity, will satisfy our projected working capital and other cash requirements for at least the next 12 months.

Recent Accounting Pronouncements

In December 2004, the FASB issued SFAS No. 123 (revised 2004) Share-Based Payment (SFAS 123R), which replaces SFAS No. 123 Accounting for Stock-Based Compensation (SFAS 123) and supersedes APB Opinion No. 25 Accounting for Stock Issued to Employees. SFAS 123(R) requires all share-based payments to employees, including grants of employee stock options, to be recognized in the financial statements based on their fair values beginning with the first interim or annual period after December 31, 2005 (this date was changed from June 15, 2005, by the U.S. Securities and Exchange Commission (SEC) on April 14, 2005). The pro forma disclosures previously permitted under SFAS 123 no longer will be an alternative to financial statement recognition. Under SFAS 123(R), beginning January 1, 2006, we must determine the appropriate fair value model to be used for valuing share-based payments, the amortization method for compensation cost and the transition method to be used at the date of adoption. The transition methods include a modified-prospective and a modified-retroactive adoption options. Under the modified-retroactive option, prior periods may be restated either as of the beginning of the year of adoption or for all periods presented. The modified-prospective method requires that compensation expense be recorded for all unvested stock options and restricted stock at the beginning of the first quarter of adoption of SFAS 123(R), while the modified-retroactive methods would record compensation expense for all unvested stock options and restricted stock beginning with the first period restated. We are evaluating the requirements of SFAS 123(R), and expect that the adoption of SFAS 123(R) will have a material impact on our consolidated results of operations and earnings per share. We have not yet determined the method of adoption or the effect of adopting SFAS 123(R), and it has not been determined whether the adoption will result in amounts that are similar to the current pro forma disclosures under SFAS 123.

In March 2005, the SEC issued Staff Accounting Bulletin (SAB) 107, Share-Based Payment, which expresses views of the SEC staff regarding the application of SFAS No. 123(R). Among other things, SAB 107 provides interpretive guidance related to the interaction between SFAS No. 123(R) and certain SEC rules and regulations, as well as the SEC staff’s views regarding the valuation of share-based payment arrangements for public companies.

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In March 2005, the FASB issued FSP No. 46(R)-5, Implicit Variable Interests under FASB Interpretation No. 46 (revised December 2003), Consolidation of Variable Interest Entities (FSP 46(R)-5), which provides guidance for a reporting enterprise on whether it holds an implicit variable interest in a variable interest entity (VIE) or potential VIE when specific conditions exist. FSP 46(R)-5 is effective the first period beginning after March 3, 2005. We are currently evaluating the effect that the adoption of FSP 46(R)-5 will have on our consolidated results of operations and financial condition but do not expect it to have a material impact.

In December 2004, the FASB issued FASB Staff Position No.109-1 (FAS 109-1), Application of FASB Statement No.109, Accounting for Income Taxes, to the Tax Deduction on Qualified Production Activities Provided by the American Jobs Creation Act of 2004 (the AJCA). The AJCA introduces a special 9% tax deduction on qualified production activities. FAS 109-1 clarifies that this tax deduction should be accounted for as a special tax deduction in accordance with Statement 109. We are currently evaluating the impact of FAS 109-1, however we do not believe it will have a material impact on our financial statements.

Factors That May Affect Future Results of Operations

In addition to the other information in this report, the following factors should be considered carefully in evaluating our business before purchasing shares of our stock.

Our quarterly operating results are volatile and difficult to predict. If we fail to meet the expectations of public market analysts or investors, the market price of our common stock may decrease significantly. Our net revenues and operating results have varied significantly in the past, are difficult to forecast, are subject to numerous factors both within and outside of our control, and may fluctuate significantly in the future. As a result, our quarterly operating results could fall below the expectations of public market analysts or investors. If that occurs, the price of our stock may decline.

Some of the factors that could affect our operating results include the following:

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We do not have long-term contracts with any of our customers and if they fail to place, or if they cancel or reschedule orders for our products, our operating results and business may suffer. Our business is characterized by short-term customer orders and shipment schedules. Our customer base is highly concentrated, and a relatively small number of distributors, OEMs and merchant power supply manufacturers account for a significant portion of our revenues. The ordering patterns of some of our existing large customers have been unpredictable in the past and we expect that customer-ordering patterns will continue to be unpredictable in the future. Not only does the volume of units ordered by particular customers vary substantially from period to period, but also purchase orders received from particular customers often vary substantially from early oral estimates provided by those customers for planning purposes. In addition, customer orders can be canceled or rescheduled without significant penalty to the customer. In the past we have experienced customer cancellations of substantial orders for reasons beyond our control, and significant cancellations could occur again at any time.

Intense competition in the high-voltage power supply industry may lead to a decrease in the average selling price and reduced sales volume of our products, which may harm our business. The high-voltage power supply industry is intensely competitive and characterized by significant price erosion. Our products face competition from alternative technologies, such as, traditional linear transformers, discrete switcher power supplies, and other integrated and hybrid solutions. If the price of competing solutions decreases significantly, the cost effectiveness of our products will be adversely affected. If power requirements for applications in which our products are currently utilized go outside the cost effective range of our products, some of these alternative technologies can be used more cost effectively. We cannot assure that our products will continue to compete favorably or that we will be successful in the face of increasing competition from new products and enhancements introduced by existing competitors or new companies entering this market. We believe our failure to compete successfully in the high-voltage power supply business, including our ability to introduce new products with higher average selling prices, would materially harm our operating results.

If demand for our products declines in the major end markets that we serve, our net revenues will decrease. Applications of our products in the consumer, communications and computer end markets, such as cellular phone chargers, stand-by power supplies for PCs, power supplies for TV set top boxes and power supplies for home appliances have and will continue to account for a large percentage of our net revenues. We expect that a significant level of our net revenues and operating results will continue to be dependent upon these applications in the near term. The demand for these products has been highly cyclical and has been subject to significant economic downturns at various times. Announcements of economic slowdown by major companies in any of the end markets we serve, could indirectly through our customers, cause a slowdown in demand for some of our ICs. When our customers are not successful in maintaining high levels of demand for their products, their demand for our ICs decreases, which adversely affects our operating results. Any significant downturn in demand in these markets would cause our net revenues to decline and could cause the price of our stock to fall.

Recently enacted changes in securities laws and regulations will continue to increase our costs. The Sarbanes-Oxley Act of 2002 requires changes in some of our corporate governance practices. The Sarbanes-Oxley Act also requires the SEC to promulgate new rules on a variety of subjects. In addition to final rules made by the SEC, Nasdaq has revised its requirements for companies that are Nasdaq-listed. These new rules and regulations have and will increase our legal and financial compliance costs, and make some activities more difficult, time consuming and/or costly. These new rules and regulations also make it more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced coverage or incur substantially higher costs to obtain coverage. These new rules and regulations could also make it more difficult for us to attract and retain qualified members of our board of directors, particularly qualified members to serve on our audit committee, and qualified executive officers.

Additionally, our efforts to comply with Section 404 of the Sarbanes-Oxley Act and the related regulations regarding our required assessment of our internal controls over financial reporting and our external auditors’ audit of the assessment of our internal controls continues to require the commitment of significant financial and managerial resources. Although we believe that the ongoing review of our internal controls over financial reporting will enable us to provide an assessment of our internal controls and our external auditors to provide their audit opinion, we can give no assurance that such assessment will continue to be successfully completed.

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Moreover, because these laws, regulations and standards promulgated by the Sarbanes-Oxley Act are subject to varying interpretations, their application in practice may evolve over time as new guidance becomes available. This evolution may result in continuing uncertainty regarding compliance matters and additional costs necessitated by ongoing revisions to our disclosure and governance practices.

If we are unable to adequately protect or enforce our intellectual property rights, we could lose market share, incur costly litigation expenses, suffer incremental price erosion or lose valuable assets, any of which could harm our operations and negatively impact our profitability. Our success depends upon our ability to protect our intellectual property, including patents, trade secrets, copyrights, and know-how, and to continue our technological innovation. We cannot assure that the steps we have taken to protect our intellectual property will be adequate to prevent misappropriation or that others will not develop competitive technologies or products. From time to time we have received, and we may receive in the future, communications alleging possible infringement of patents or other intellectual property rights of others. Litigation, which could result in substantial cost to us, may be necessary to enforce our patents or other intellectual property rights or to defend us against claimed infringement of the rights of others. The failure to obtain necessary licenses or other rights or litigation arising out of infringement claims could cause us to lose market share and harm our business.

There can be no assurance that we will prevail in our litigation with either System General or Fairchild. This litigation, whether or not determined in our favor or settled by us, will be costly and will divert the efforts and attention of our management and technical personnel from normal business operations, which could have a material adverse effect on our business, financial condition and operating results. Adverse determinations in litigation could result in the loss of our proprietary rights, subject us to significant liabilities, require us to seek licenses from third parties or prevent us from licensing our technology, any of which could have a material adverse effect on our business, financial condition and operating results.

Moreover, the laws of some foreign countries in which our technology is or may in the future be licensed may not protect our intellectual property rights to the same extent as the laws of the United States, thus increasing the possibility of infringement of our intellectual property.

Changes to GAAP that will require recording compensation expense for employee stock options and employee stock purchase plans. The FASB recently enacted SFAS 123(R), which will require us to adopt a different method of determining the compensation expense of our employee stock options and employee stock purchase plan. SFAS 123(R) will have a significant adverse effect on our reported financial conditions and may impact the way we conduct our business.

We depend on third-party suppliers to provide us with wafers for our products and if they fail to provide us sufficient wafers, our business will suffer. We have supply arrangements for the production of wafers with Matsushita, which expires in June 2005; we are currently in discussions with them on renewal of our agreement, with OKI, which expires in April 2008, and with ZMD, which expires in December 2009. Although certain aspects of our relationships with Matsushita, OKI and ZMD are contractual, many important aspects of these relationships depend on their continued cooperation. We cannot assure that we will continue to work successfully with Matsushita, OKI or ZMD in the future, that the wafer foundries’ capacity will meet our needs, or that any of them will not seek an early termination of our wafer supply agreements. Any serious disruption in the supply of wafers from OKI, Matsushita or ZMD would harm our business. We estimate that it would take 9 to 18 months from the time we identified an alternate manufacturing source before that source could produce wafers with acceptable manufacturing yields in sufficient quantities to meet our needs.

Although we provide Matsushita, OKI and ZMD with rolling forecasts of our production requirements, their ability to provide wafers to us is ultimately limited by the available capacity of the wafer foundry in which they manufacture wafers for us. Any reduction in wafer foundry capacity available to us could require us to pay amounts in excess of contracted or anticipated amounts for wafer deliveries or require us to make other concessions in order to acquire the wafer supply necessary to meet our customers’ requirements. Any of these concessions could harm our business.

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If our third-party suppliers and independent subcontractors do not produce our wafers and assemble our finished products at acceptable yields, our net revenues may decline. We depend on independent foundries to produce wafers, and independent subcontractors to assemble and test finished products, at acceptable yields and to deliver them to us in a timely manner. The failure of the foundries to supply us wafers at acceptable yields could prevent us from selling our products to our customers and would likely cause a decline in our net revenues. In addition, our IC assembly process requires our manufacturers to use a high-voltage molding compound available from only one vendor, which is difficult to process. This compound and its required processes, together with the other non-standard materials and processes needed to assemble our products, require a more exacting level of process control than normally required for standard packages. Unavailability of the sole source compound or problems with the assembly process can materially adversely affect yields, timely delivery and cost to manufacture. We cannot assure that acceptable yields will be maintainable in the future.

Fluctuations in exchange rates, particularly the exchange rates between the U.S. dollar and the Japanese yen may impact our gross margin. The contract prices to purchase wafers from Matsushita and OKI are denominated in Japanese yen. The agreements with both vendors allow for mutual sharing of the impact of the exchange rate fluctuation between Japanese yen and the U.S. dollar. Nevertheless, changes in the exchange rate between the U.S. dollar and the Japanese yen subject our gross profit and operating results to the potential for material fluctuations.

Matsushita has licenses to our technology, which it may use to our detriment. Our ability to take advantage of the potentially large Japanese market for our products is largely dependent on Matsushita and its ability to promote and deliver our products. Pursuant to our agreement with Matsushita, Matsushita has the right to manufacture and sell products using our technology to Japanese companies worldwide and to subsidiaries of Japanese companies located in Asia. Although we receive royalties on Matsushita’s sales, these royalties are substantially lower than the gross profit we receive on direct sales. We cannot assure that Matsushita will not use the technology rights within the restrictions we have granted it to develop or market competing products following any termination of its relationship with us or after termination of Matsushita’s royalty obligation to us.

Because the sales cycle for our products can be lengthy, we may incur substantial expenses before we generate significant revenues, if any. Our products are generally incorporated into a customer’s products at the design stage. However, customer decisions to use our products, commonly referred to as design wins, which can often require us to expend significant research and development and sales and marketing resources without any assurance of success, often precede volume sales, if any, by a year or more. The value of any design win will largely depend upon the commercial success of the customer’s product. We cannot assure that we will continue to achieve design wins or that any design win will result in future revenues. If a customer decides at the design stage not to incorporate our products into its product, we may not have another opportunity for a design win with respect to that product for many months or years.

Our products must meet exacting specifications, and undetected defects and failures may occur which may cause customers to return or stop buying our products. Our customers generally establish demanding specifications for quality, performance and reliability that our products must meet. ICs as complex as those we sell often encounter development delays and may contain undetected defects or failures when first introduced or after commencement of commercial shipments. We have from time to time in the past experienced product quality, performance or reliability problems. If defects and failures occur in our products, we could experience lost revenue, increased costs, including warranty expense and costs associated with customer support, delays in or cancellations or rescheduling of orders or shipments and product returns or discounts, any of which would harm our operating results.

Our international sales activities account for a substantial portion of our net revenues and subject us to substantial risks. Sales to customers outside of the United States account for, and have accounted for a large portion of our net revenues, including approximately 91% and 92% of our net revenues for the three months ended March 31, 2005 and 2004, respectively. If our international sales declined and we were unable to increase domestic sales, our revenues would decline and our operating results would be harmed. International sales involve a number of risks to us, including:

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Our failure to adequately address these risks could reduce our international sales, which would materially adversely affect our operating results. Furthermore, because substantially all of our foreign sales are denominated in U.S. dollars, increases in the value of the dollar increase the price in local currencies of our products in foreign markets and make our products relatively more expensive and less price competitive than competitors’ products that are priced in local currencies.

If our efforts to enhance existing products and introduce new products are not successful, we may not be able to generate demand for our products. Our success depends in significant part upon our ability to develop new ICs for high-voltage power conversion for existing and new markets, to introduce these products in a timely manner and to have these products selected for design into products of leading manufacturers. New product introduction schedules are subject to the risks and uncertainties that typically accompany development and delivery of complex technologies to the market place, including product development delays and defects. If we fail to develop and sell new products in a timely manner, our net revenues could decline.

In addition, we cannot be sure that we will be able to adjust to changing market demands as quickly and cost-effectively as necessary to compete successfully. Furthermore, we cannot assure that we will be able to introduce new products in a timely and cost-effective manner or in sufficient quantities to meet customer demand or that these products will achieve market acceptance. Our failure, or our customers’ failure to develop and introduce new products successfully and in a timely manner would harm our business and may cause the price of our common stock to fall. In addition, customers may defer or return orders for existing products in response to the introduction of new products. Although we maintain reserves for potential customer returns, we cannot assure that these reserves will be adequate.

If our products do not penetrate additional markets, our business will not grow as we expect. We believe that our future success depends in part upon our ability to penetrate additional markets for our products. We cannot assure that we will be able to overcome the marketing or technological challenges necessary to do so. To the extent that a competitor penetrates additional markets before we do, or takes market share from us in our existing markets, our net revenues and financial condition could be materially adversely affected.

We must attract and retain qualified personnel to be successful and competition for qualified personnel is intense in our market. Our success depends to a significant extent upon the continued service of our executive officers and other key management and technical personnel, and on our ability to continue to attract, retain and motivate qualified personnel, such as experienced analog design engineers and systems applications engineers. The competition for these employees is intense, particularly in Silicon Valley. The loss of the services of one or more of our engineers, executive officers or other key personnel could harm our business. In addition, if one or more of these individuals leaves our employ, and we are unable to quickly and efficiently replace those individuals with qualified personnel who can smoothly transition into their new roles, our business may suffer. We do not have long-term employment contracts with, and we do not have in place key person life insurance policies on, any of our employees.

Changes in environmental laws and regulations may potentially increase our costs related to obsolete products in our existing inventory. Changing environmental regulations and the timetable to implement them are continuing to modify our customers demand for our products. As a result there could be an increase in our inventory obsolescence costs for products manufactured prior to our customer’s adoption of new regulations. Currently we have limited visibility into our customers’ strategies to implement these changing environmental regulations into their business. The inability to accurately determine our customer’s strategies could increase our inventory costs related to obsolescence.

We have adopted anti-takeover measures, which may make it more difficult for a third party to acquire us. Our board of directors has the authority to issue up to 3,000,000 shares of preferred stock and to determine the price, rights, preferences and privileges of those shares without any further vote or action by the stockholders. The rights of the holders of common stock will be subject to, and may be adversely affected by, the rights of the holders of any preferred stock that may be issued in the future. The issuance of shares of preferred stock, while potentially providing flexibility in connection with possible acquisitions and for other corporate purposes, could have the effect of making it more difficult for a third party to acquire a majority of our outstanding voting stock. We have no present intention to issue shares of preferred stock.

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In addition, our board of directors adopted a Preferred Stock Purchase Rights Plan intended to guard against hostile takeover tactics. The existence of this plan could have the effect of making it more difficult for a third party to acquire a majority of our outstanding voting stock.

The future trading price of our common stock could be subject to wide fluctuations in response to a variety of factors. The price of our common stock has been, and is likely to be, volatile. Factors including future announcements concerning us, our customers or our competitors, quarterly variations in operating results, announcements of technological innovations, the introduction of new products or changes in our product pricing policies or those of our competitors, proprietary rights or other litigation, changes in earnings estimates by analysts and other factors could cause the market price of our common stock to fluctuate substantially. In addition, stock prices for many technology companies fluctuate widely for reasons, which may be unrelated to operating results. These fluctuations, as well as general economic, market and political conditions may harm the market price of our common stock.

In the event of an earthquake, terrorist act or other disaster, our operations may be interrupted and our business would be harmed. Our principal executive offices and operating facilities situated near San Francisco, California, and most of our major suppliers (wafer foundries and assembly houses), are located in areas that have been subject to severe earthquakes. In the event of an earthquake, we and/or most of our major suppliers may be temporarily unable to continue operations and may suffer significant property damage. Any such interruption in our ability or that of our major suppliers to continue operations at our facilities could delay the development and shipment of our products.

Like other U.S. companies, our business and operating results are subject to uncertainties arising out of economic consequences of current and potential military actions or terrorist activities and associated political instability, and the impact of heightened security concerns on domestic and international travel and commerce. Such uncertainties could also lead to delays or cancellations of customer orders, a general decrease in corporate spending or our inability to effectively market and sell our products. Any of these results could substantially harm our business and results of operations, causing a decrease in our revenues.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK.

There has not been a material change in our exposure to interest rate and foreign currency risks from that described in our 2004 Annual Report on Form 10-K.

Interest Rate Risk. Our exposure to market risk for changes in interest rates relates primarily to our investment portfolio. We do not use derivative financial instruments in our investment portfolio to manage our interest rate risk, foreign currency risk, or for any other purpose. We invest in high-credit quality issuers and, by policy, limit the amount of credit exposure to any one issuer. As stated in our policy, we ensure the safety and preservation of our invested principal funds by limiting default risk, market risk and reinvestment risk. We mitigate default risk by investing in safe and high-credit quality securities and by constantly positioning our portfolio to respond appropriately to a significant reduction in a credit rating of any investment issuer, guarantor or depository. The portfolio includes only marketable securities with active secondary or resale markets to ensure portfolio liquidity.

The table below presents carrying value and related weighted average interest rates for our investment portfolio at March 31, 2005.

(in thousands, except average interest rates)

Foreign Currency Exchange Risk. We transact business in various foreign countries. Our primary foreign currency cash flows are in Asia and Western Europe. Currently, we do not employ a foreign currency hedge program utilizing foreign currency forward exchange contracts; however, the contract prices to purchase wafers from Matsushita and OKI are denominated in Japanese yen and both agreements allow for mutual sharing of the impact of the exchange rate fluctuation between Japanese yen and the U.S. dollar. Nevertheless, changes in the exchange rate between the U.S. dollar and the Japanese yen subject our gross profit and operating results to the potential for material fluctuations. We maintain a Japanese yen account with a U. S. bank for payments to our wafer suppliers in Japan.

ITEM 4. CONTROLS AND PROCEDURES.

(a) Under the supervision and with the participation of our management, including our chief executive officer and chief financial officer, we evaluated the effectiveness of the design and operation of our disclosure controls and procedures, as such term is defined under Rule 13a-15(e) promulgated under the Securities Exchange Act of 1934, as amended, as of the end of the period covered by this report. Based on this evaluation, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures were effective as of that date.

(b) There has been no change in our internal control over financial reporting during the quarter ended March 31, 2005, that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

On June 28, 2004, the Company filed a complaint for patent infringement in the U.S. District Court, Northern District of California, against System General Corporation, a Taiwanese company and its U.S. subsidiary. The Company’s complaint alleges that certain integrated circuits produced by System General Corporation infringed and continue to infringe certain of the Company’s patents. The Company seeks, among other things, an order enjoining System General Corporation from infringing the Company’s patents and an award for damages resulting from the alleged infringement.

On October 20, 2004, the Company filed a complaint for patent infringement in the U.S. District Court for the District of Delaware, against Fairchild Semiconductor International, Inc., a Delaware corporation, and Fairchild Semiconductor Corporation, a Delaware corporation (collectively, Fairchild). The Company’s complaint alleges that Fairchild produces certain integrated circuits, which infringed and continue to infringe certain of the Company’s patents. The Company seeks, among other things, an order enjoining Fairchild from infringing the Company’s patents and an award for damages resulting from the alleged infringement.

There can be no assurance that the Company will prevail in its litigation with either System General or Fairchild. This litigation, whether or not determined in the Company’s favor or settled by the Company, will be costly and will divert the efforts and attention of the Company’s management and technical personnel from normal business operations, which could have a material adverse effect on the Company’s business, financial condition and operating results. Adverse determinations in litigation could result in the loss of the Company’s proprietary rights, subject the Company to significant liabilities, require the Company to seek licenses from third parties or prevent the Company from licensing its technology, any of which could have a material adverse effect on the Company’s business, financial condition and operating results.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

On October 20, 2004, the Company announced that its board of directors had authorized the repurchase of up to $40.0 million of the Company’s common stock. The board directed that the repurchases be made pursuant to Rule 10b5-1 of the Exchange Act. From the inception of the stock repurchase program in 2004, to March 31, 2005, a total of 1,660,000 shares were repurchased for approximately $31.9 million. The Company repurchased 1.1 million shares for approximately $20.2 million during the three months ended March 31, 2005. The repurchase program may be suspended or discontinued at any time.

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ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

None.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned, thereunto duly authorized.

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