Monolithic Power Systems, Inc.
Apr 27, 2007

Monolithic Power Systems, Inc. Announces Results for First Quarter of 2007

SAN JOSE, Calif. April 27, 2007-- Monolithic Power Systems (MPS) (Nasdaq: MPWR), a leading fabless manufacturer of high-performance analog and mixed-signal semiconductors, today announced financial results for the quarter ended March 31, 2007.

The results for the quarter ended March 31, 2007 are as follows:

“The first quarter is typically a slow quarter, but we met our revenue and bottom line targets, and the second quarter business environment looks very positive for MPS," said Michael Hsing, chief executive officer of MPS. "I am especially excited about our continuing success in developing leading edge new products from our technology expertise, such as the MiniMonster™ line announced in 2006. This quarter, I am pleased to announce a new process development, the BCD HV™ technology, which has just delivered first silicon on a new 600 volt power driver product that we believe will open up new applications for MPS' products.”

Business Outlook
The following are MPS' financial targets for the second quarter ending June 30, 2007:

(1) Non-GAAP net income, non-GAAP operating expenses and non-GAAP research and development and selling, general and administrative expense differ from net income, operating expenses, and research and development and selling, general and administrative expense determined in accordance with GAAP (Generally Accepted Accounting Principles in the United States). Non-GAAP net income excludes the effect of stock-based compensation expense and related tax effects. Non-GAAP operating expenses for the first quarter ending March 31, 2007 exclude the effect of stock-based compensation expense. Projected non-GAAP research and development and selling, general and administrative expense exclude the effect of stock-based compensation expense. A schedule reconciling these amounts is included in this news release. Non-GAAP financial measures should not be considered as a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP. MPS utilizes both GAAP and non-GAAP financial measures to assess what it believes to be its core operating performance and to evaluate and manage its internal business and assist in making financial operating decisions. MPS believes that the inclusion of non-GAAP financial measures, together with GAAP measures, provides investors with an alternative presentation useful to investors' understanding of MPS' core operating results and trends. Additionally, MPS believes that the inclusion of non-GAAP measures, together with GAAP measures, provides investors with an additional dimension of comparability to similar companies. However, investors should be aware that non-GAAP financial measures utilized by other companies are not likely to be comparable in most cases to the non-GAAP financials measures used by MPS.

Conference Call
MPS plans to conduct a management teleconference covering its first quarter results at 5:30 a.m. PDT / 8:30 a.m. EDT today, April 27, 2007. The call will be webcast at In addition to the webcast replay, which will be archived for all investors for one year on the MPS website, a phone replay will be available for seven days after the live call at 617-801-6888, code number 49634601. This press release and any other information related to the call will also be posted on the website.

Safe Harbor Statement
This press release contains forward-looking statements regarding MPS' planned product offerings, targeted net revenues, gross margin, GAAP and non-GAAP research and development and selling, general and administrative expense, stock-based compensation expense and litigation expenses for the fiscal quarter ending June 30, 2007. These statements are not historical facts or guarantees of future performance or events, are based on current expectations, estimates, beliefs, assumptions, goals, and objectives, and involve known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from the results expressed by these statements. Readers of this press release and listeners to the accompanying conference call are cautioned not to place undue reliance on any forward-looking statements. Factors that could cause actual results to differ include, but are not limited to, the risks, uncertainties and costs of litigation in which the company is involved; the outcome of any upcoming trials, hearings, motions, and appeals; any interruptions in MPS' schedule of new product release development; adverse change in production and testing efficiency; adverse changes in government regulations in foreign countries where MPS has offices; acceptance of, or demand for, MPS' products being lower than expected; the adverse impact on MPS' financial performance if its tax and litigation provisions are inadequate; difficulty in predicting or budgeting for future expenses and financial contingencies; and other important risk factors identified in MPS' SEC filings, including, but not limited to, its Annual Report on Form 10-K filed on March 16, 2007.

The forward-looking statements in this press release represent MPS' targets, not predictions of actual performance. MPS assumes no obligation to update the information in this press release or in the accompanying conference call. Any statements by persons outside of MPS speculating on the progress of the quarter or other aspects of MPS' business are not based on internal MPS information and should be assessed accordingly by investors.

About Monolithic Power Systems
Monolithic Power Systems, Inc. (MPS) develops and markets proprietary, advanced analog and mixed-signal semiconductors. The company combines advanced process technology with its highly experienced analog designers to produce high-performance power management integrated circuits (ICs) for DC to DC converters, LED drivers, Cold Cathode Fluorescent Lamp (CCFL) backlight controllers, Class D audio amplifiers, and Linear ICs. MPS products are used extensively in computing and network communications products, LCD monitors and TVs, and a wide variety of consumer and portable electronics products. MPS partners with world-class manufacturing organizations to deliver top quality, ultra-compact, high-performance solutions through the most productive, cost-efficient channels. Founded in 1997 and headquartered in Los Gatos, California, the company has expanded its global presence with sales offices in Taiwan, China, Korea, Japan, and Europe, which operate under MPS International, Ltd.

Monolithic Power Systems, MPS, and the MPS logo are registered trademarks of Monolithic Power Systems, Inc. in the U.S. and trademarked in certain other countries. BCD HV and MiniMonster are Trademarks of Monolithic Power Systems, Inc.


Monolithic Power Systems, Inc.
Consolidated Balance Sheet
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Monolithic Power Systems, Inc.
Consolidated Income Statement
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