Synchronous Buck Regulator promotes battery efficiency.

Press Release Summary:

Contained in 3 x 3 mm MLF® package, MIC2238 2.5 MHz dual 800 mA synchronous buck step-down regulator features Trickle Mode(TM) enabling light load efficiency for Li-Ion battery powered systems. Device offers input voltage range from 2.5-5.5 V and ultra-low quiescent current of 28 µA at light loads. Operation modes include Variable frequency Trickle Mode(TM) operation for highest light load efficiency and option for running device at constant frequency.

Original Press Release:

Micrel Launches Dual 800 mA High Efficiency 2.5 MHz Synchronous Buck Regulator Featuring Trickle Mode(TM) for Light Load Operation

High Power and Ultra Efficiency Devices Targeted At Industry's Most Demanding Hand-Held Applications

SAN JOSE, Calif., Aug. 6 / / -- Micrel Inc., (NASDAQ:MCRL), an industry leader in analog, high bandwidth communications and Ethernet IC solutions, today launched the MIC2238, a 2.5MHz dual 800mA synchronous buck (step-down) regulator housed in a tiny 3mm x 3mm MLF(R) package. The MIC2238's unique switching architecture scheme, Trickle Mode(TM), enables industry-leading light load efficiency for Li-Ion battery powered systems that require maximum efficiency in order to prolong use. The MIC2238 is a perfect choice for portable applications including cellular phones, portable media players, WiMax modules, GPS systems, digital still and video cameras. The MIC2238 is currently available in volume, with pricing starting at $1.70, for 1K quantities.

"While today's handheld devices are becoming more powerful, consumers also expect longer battery lives and standby times," noted Ralf Muenster, Micrel's director of marketing for power products. "Providing two out-of-phase outputs of up to 800mA each, Micrel's MIC2238 has the horse power to drive today's most demanding portable applications while at the same time, offering astounding light load efficiencies of up to 94 percent at 5mA and peak efficiencies of more than 96 percent."

The device offers an input voltage range from 2.5 to 5.5V and an ultra-low quiescent current of 28uA at light loads. This assures that only a trickle of current is drawn from the battery, thereby and extending valuable standby time. Moreover, the MIC2238's design offers two modes of operation, a variable frequency Trickle Mode(TM) operation for highest light load efficiency with an automatic switchover into full load, and an option for running the device at a constant frequency. In addition, the device offers a power good output signal for sequencing capability. The MIC2238 is available in a tiny 12-pin 3mm x 3mm MLF(R) with a junction operating range from 40 degrees C to +125 degrees C.

About Micrel, Inc.

Micrel Inc., is a leading global manufacturer of IC solutions for the worldwide analog, Ethernet and high bandwidth markets. The Company's products include advanced mixed-signal, analog and power semiconductors; high performance communication, clock management, Ethernet switch and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe and Asia. In addition, the Company maintains an extensive network of distributors and reps worldwide. Web:

Note: MLF is a registered trademark of Amkor Technology. Trickle Mode(TM) is a trademark of Micrel, Inc.

Source: Micrel, Inc.

CONTACT: Julieanne DiBene, Marketing Communications of Micrel, Inc.,

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