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Step-down regulator features Trickle Mode operation

Posted: 08 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous buck regulator? Li-ion battery? portable application?

Micrel Inc. has unveiled the MIC2238, a 2.5MHz dual 800mA synchronous buck (step-down) regulator housed in 3mm x 3mm MLF package, with a junction operating range from -40C to 125C.

The MIC2238's switching architecture scheme, Trickle Mode, enables light load efficiency for Li-ion battery powered systems that require maximum efficiency in order to prolong use. The regulator is designed for portable applications including cellphones, portable media players, WiMAX modules, GPS systems, digital still and video cameras.

The device also offers an input voltage range from 2.5V to 5.5V and an ultralow quiescent current of 28?A at light loads. This assures that only a trickle of current is drawn from the battery, extending valuable standby time.

In addition, the MIC2238's design offers two modes of operation, a variable frequency Trickle Mode operation for highest light load efficiency with an automatic switchover into full load, and an option for running the device at a constant frequency. The regulator also offers a power good output signal for sequencing capability.

"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 MIC2238 is available in volume, with pricing starting at $1.70, for 1,000-unit quantities.

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