Class-D Amplifier Architecture Patent Issued to OMicro

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January 31, 2011.O₂Micro® International Limited (NASDAQ®:

OIIM

) was issued 27 claimsunder United States patent number 7,868,693 for its Class-D Amplifier architecture; a continuation of the invention issued March 2009 under United States patent number 7,501,886.

O₂Micro's patented IC’s innovative design enables minimized distortion. Class-D Amplifiers are commonly used to drive loudspeaker applications.

Laszlo Lipcsei, vice president, O₂Micro, remarked “Class-D amplifiers equipped with this new architecture provide the chief benefit of increased efficiency and high fidelity audio, compared to conventional designs.”

About O₂Micro

Founded in April 1995, O₂Micro develops and markets innovative power management and e-commerce components for the Computer, Consumer, Industrial, and Communications markets. Products include Intelligent Lighting, Battery Management, Power Management,and SmartCardBus®.

O₂Micro International maintains an extensive portfolio of intellectual property with 15,621 patent claims granted, and over 16,000 more pending. The company maintains offices worldwide. Additional company and product information can be found on thecompany website at www.o2micro.com.

O₂Micro, the O₂Micro logo, SmartCardBus, and combinations thereof are registered trademarks of O₂Micro. All other trademarks or registered trademarks are the property of their respective owners.

Contact Information:
Gary E. Abbott
Director of Investor Relations, O₂Micro
Phone: 408.987.5920. x8888
Email:gary.abbott@o2micro.com

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