Exhibit 99.1

For investor information contact:

Heidi Flannery, Investor Relations

(510) 743-1718

investor@volterra.com

Volterra Reports Record Quarterly Revenue and Increases Share Repurchase Plan

FREMONT, Calif., July 23, 2012 — Volterra Semiconductor Corporation (Nasdaq: VLTR), a leading provider of high-performance analog and mixed-signal power management semiconductors, today reported financial results for its quarter ended June 30, 2012.

Net revenue for the second quarter of 2012 was $43.6 million, a 4% increase from $42.1 million in the first quarter of 2012, and a 4% increase from $41.7 million in the second quarter of 2011. GAAP net income was $6.0 million, or $0.22 per share (diluted), a 3% decrease from $6.2 million, or $0.23 per share (diluted) in the first quarter of 2012, and a 13% increase from $5.3 million, or $0.20 per share (diluted), in the second quarter of 2011.

Volterra also reported net income and diluted net income per share on a non-GAAP basis. Non-GAAP net income excludes the effect of stock-based compensation expense. Non-GAAP net income was $8.5 million, or $0.32 per share (diluted), in the second quarter of 2012, a 1% decrease from $8.6 million, or $0.32 per share (diluted), in the first quarter of 2012, and a 14% increase from $7.4 million, or $0.28 per share (diluted), in the second quarter of 2011.

“We are pleased to report record revenue for the second quarter, despite the challenging economic environment,” said Volterra President and CEO Jeff Staszak. “We are benefiting from market share gains on new servers and notebooks which we expect to continue to ramp through 2012.”

Volterra also announced that its Board of Directors recently approved an expansion of its previously authorized share repurchase plan by an additional $15 million.

Repurchases under Volterra’s repurchase plan may be made from time to time on the open market at prevailing market prices or in negotiated transactions off the market. The repurchases shall be made in compliance with applicable rules and regulations and may be made under a plan that complies with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.

Earnings Conference Call

Volterra will be conducting a conference call today at 2:30 p.m. (PDT). To access the conference call, investors can dial (877) 941-0844 approximately ten minutes prior to the initiation of the teleconference. International and local participants can dial (480) 629-9835. Investors should reference Volterra. A digital replay of the conference call will be available until midnight on Monday, July 30, 2012. To access the replay, investors should dial (800) 406-7325 or (303) 590-3030 and enter access code 4549369#. A webcast of the conference call also will be available from the Investors section of the Company’s website at: http://www.volterra.com until midnight on Monday, August 20, 2012.

About Volterra Semiconductor Corporation

Volterra Semiconductor Corporation, headquartered in Fremont, CA, designs, develops, and markets leading edge silicon solutions for low-voltage power delivery. The Company’s product portfolio is focused on advanced switching regulators for the computer, datacom, storage, and portable markets. Volterra operates as a fabless semiconductor company utilizing world-class foundries for silicon supply. The Company is focused on creating products with high intellectual property content that match specific customer needs. For more information, please visit http://www.volterra.com.

Non-GAAP Financial Measures

Volterra provides all information required in accordance with generally accepted accounting principles (GAAP), but it believes that evaluating its financial results may be difficult if limited to reviewing only GAAP financial measures. Volterra’s management believes the non-GAAP information provided is useful to investors and other users of its financial information and its inclusion with our financial results is warranted for several reasons:

* it can enhance the understanding of Volterra’s financial performance by adjusting for special, non-recurring items that may obscure results and trends in our core operating performance, particularly in reconciling differences between reported income and actual cash flows;

* it can provide consistency in reviewing Volterra’s historical performance between periods, as well as allowing for better comparisons of Volterra’s performance with similar companies in Volterra’s industry;

* it allows users to evaluate the results of the business using the same financial measures that management uses to evaluate and manage Volterra’s internal planning, budgeting and operations; and

* it provides investors with additional information used by management, its board of directors and committees thereof, to determine management compensation.

Volterra’s management reports and uses calculations of (i) non-GAAP gross margin and non-GAAP gross margin as a percent of revenue, which represents gross margin excluding the effect of stock-based compensation; (ii) non-GAAP income from operations (and its components, non-GAAP research and development expense, non-GAAP selling, general, and administrative expense, non-GAAP total operating expenses, and including non-GAAP gross margin as indicated above) as well as non-GAAP operating margin as a percent of revenue which represent income from operations and its components excluding the effect of stock-based compensation and special items such as restructuring charges; and (iii) non-GAAP net income (and its components listed above), non-GAAP net margin as a percent of revenue, and non-GAAP diluted net income per share, which represents net income and diluted net income per share excluding the effect of stock-based compensation expense and special items such as restructuring charges.

Investors should note that the non-GAAP financial measures used by Volterra may not be the same non-GAAP financial measures, and may not be calculated in the same manner, as that of other companies. Whenever Volterra discloses such a non-GAAP financial measure, it provides a reconciliation of non-GAAP financial measures to what it believes to be the most closely applicable GAAP financial measure. A reconciliation of GAAP net income to non-GAAP net income is included in the financial statements portion of this release and at the Investors section of our website at www.volterra.com. Investors are encouraged to review the related GAAP financial measures and the reconciliation of these non-GAAP financial measures to their most directly comparable GAAP financial measure. Volterra does not provide a non-GAAP reconciliation for non-GAAP estimates on a forward-looking basis, as it believes it is unable to provide a meaningful or accurate calculation or estimation of stock based compensation or other special items without unreasonable effort.

Volterra is a trademark of Volterra Semiconductor Corporation and is registered in certain jurisdictions. All other names mentioned are the property of their respective owners and are mentioned for identification purposes only.

Forward-Looking Statements:

This press release regarding financial results for the quarter ended June 30, 2012 contains forward-looking statements based on current expectations of Volterra. The words “expect,” “will,” “should,” “would,” “anticipate,” “project,” “outlook,” “believe,” “intend,” and similar phrases as they relate to future events are intended to identify such forward-looking statements. These forward-looking statements reflect the current views and assumptions of Volterra but are subject to various risks and uncertainties that could cause actual results to differ materially from expectations. Among the factors that could cause actual results to differ materially from those in the forward-looking statements are the following: risks related to our ability to maintain revenue growth or other financial results; risks related to our dependence on a limited number of customers; risks related to the limited markets we operate in and the limited number of products we sell; risks related to the quality of our products or the management of our inventory; risks related to our relationship with our vendors and contractors; intellectual property litigation risk; and other factors detailed in our filings with the Securities and Exchange Commission, including the annual report on Form 10-K filed on March 6, 2012 and the quarterly report on Form 10-Q filed on May 1, 2012. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this press release. All forward-looking statements are qualified in their entirety by this cautionary statement, and Volterra undertakes no obligation to revise or update any forward-looking statements to reflect events or circumstances after the date hereof, except as required by law.

VOLTERRA SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share amounts)

(Unaudited)

VOLTERRA SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

RECONCILIATION OF GAAP TO NON-GAAP FINANCIAL MEASURES

(In thousands, except per share amounts)

(Unaudited)

VOLTERRA SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands)

(Unaudited)

VOLTERRA SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

SUPPLEMENTAL FINANCIAL AND OTHER INFORMATION

(In thousands)

(Unaudited)