U.S. Patent Office Issues Battery Monitoring Patent to OMicro

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

OIIM

) was issued 12 claims under United States patent number 7,936,151for its Battery State Monitoring circuitry; a continuation of the invention issued July 2010 under United States patent number 7,683,577.

This patented circuitry provides a “near-zero” current wake-up circuit for monitoring battery packs, during the stand-by-state. In conventional designs, battery state monitoring circuitry consumes excessive power in the stand-by-state, which adversely affectsbattery performance.

“Long battery life is a critical and highly valued feature for various battery powered cordless electrical devices. This patent can extend battery life for notebooks, cell phones, PDAs, and power tools, especially if used intermittently,” said Bill Densham,strategic marketing director, O₂Micro.

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 16,123 patent claims granted, and over 18,000 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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