OMicro's Power Supply Topology Issued Patent

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March 30, 2011.O₂Micro® International Limited (NASDAQ:

OIIM

) was issued 21 claims underUnited States patent number 7,898,218 for its Power Supply Topology.

O₂Micro's patented Power Supply topologies increase efficiency in multiple load level applications using pulse width modulation (PWM) switching frequency control.

“Controlling the switching frequency of the PWM signal allows the use of an inductor that can achieve high efficiency at both light and heavy load conditions,” commented Laszlo Lipcsei, vice president, 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 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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