CHARTER FOR THE AUDIT COMMITTEE OF THE BOARD OF DIRECTORS

OF

MONOLITHIC POWER SYSTEMS, INC.

(Amended and Adopted on February 1, 2005)

1. PURPOSE

The purpose of the Audit Committee of the Board of Directors (the “Board”) of Monolithic Power Systems, Inc. (the “Company”) shall be to:

In addition, the Audit Committee will undertake those specific duties and responsibilities listed below and such other duties as the Board may from time to time prescribe.

2. MEMBERSHIP AND ORGANIZATION

Composition. The Audit Committee members, including the Chair, will be appointed by the Board on the recommendation of the Nominating/Corporate Governance Committee. Audit Committee members may be removed from the Audit Committee, with or without cause, by the Board. The Audit Committee will consist of at least three (3) members of the Board; provided, that if at any time there is a vacancy on the Audit Committee and the remaining members meet all membership requirements, then the Audit Committee may consist of two members until the earlier of the Company’s next annual stockholders meeting or one year from the occurrence of the vacancy. Members of the Audit Committee must meet the following criteria (as well as any criteria required by the Securities and Exchange Commission (the “SEC”)) and rules adopted by the SEC (the “SEC Rules”):

Meetings and Procedures. The Chair (or in his or her absence, a member designated by the Chair) shall preside at each meeting of the Audit Committee and set the agendas for Audit Committee meetings. The Audit Committee will meet at least once during each fiscal quarter and more frequently as the Audit Committee deems desirable. . The Audit Committee may establish its own meeting schedule, notice and conduct of its meetings. The Audit Committee will meet separately, and periodically, with the management (which shall include the Company’s Chief Executive Officer, Chief Financial Officer and General Counsel each, individually and independently), with the internal auditors and with the independent auditor of the Company, at such times as it deems appropriate, but not less than quarterly.

All non-management directors that are not members of the Audit Committee may attend and observe meetings of the Audit Committee, but shall not participate in any discussion or deliberation unless invited to do so by the Audit Committee, and in any event shall not be entitled to vote. The Audit Committee may, at its discretion, include in its meetings members of the Company’s management, representatives of the independent auditor, the internal auditor, any other financial personnel employed or retained by the Company or any other persons whose presence the Audit Committee believes to be necessary or appropriate. Notwithstanding the foregoing, the Audit Committee may also exclude from its meetings any persons it deems appropriate, including, but not limited to, any non-management director that is not a member of the Audit Committee.

The Audit Committee may retain any independent counsel, experts or advisors (accounting, financial or otherwise) that the Audit Committee believes to be necessary or appropriate.The Audit Committee may also utilize the services of the Company’s regular legal counsel or other advisors to the Company. The Company shall provide for appropriate funding, as determined by the Audit Committee, for payment of compensation to the independent auditor for the purpose of rendering or issuing an audit report or performing other audit, review or attest services, for payment of compensation to any advisors employed by the Audit Committee and for ordinary administrative expenses of the Audit Committee that are necessary or appropriate in carrying out its duties. The Audit Committee may conduct or authorize investigations into any matters within the scope of the powers and responsibilities delegated to the Audit Committee.

The Audit Committee will maintain written minutes of its meetings, which minutes will be filed with the minutes of the meetings of the Board.

Compensation. Members of the Audit Committee may receive cash fees, if any, for their service as Audit Committee members as may be determined by the Board. Members of the Audit Committee may not receive any compensation from the Company except the fees that they receive for service as a member of the Board or any committee thereof. The members of the Audit Committee shall receive reimbursement of the reasonable travel expense incurred in associated with attending the Audit Committee meetings.

3. POWER AND RESPONSIBILITIES

The power and responsibilities of the Audit Committee shall include:

Internal Audit

Annual Financial Statements and Annual Audit

Separate Meetings with the Independent Auditor.

Recommendation to Include Financial Statements in Annual Report.

Quarterly Financial Statements

Other Powers and Responsibilities