Micrel Launches New Synchronous Buck Regulator Targeted At Hand-Held Applications
Micrel Inc. launched the MIC2238, a 2.5MHz dual 800mA synchronous buck (step-down) regulator housed in a tiny 3mm x 3mm MLF® package. The MIC2238’s switching architecture scheme, Trickle Mode,™ is claimed to enable industry-leading light load efficiency for Li-Ion battery powered systems that require maximum efficiency in order to prolong use. The MIC2238 is suitable for portable applications including cellular phones, portable media players, WiMax modules, GPS systems, digital still and video cameras.
"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% at 5mA and peak efficiencies of more than 96%."
The device offers an input voltage range from 2.5 to 5.5V and a quiescent current of 28µA at light loads. This assures that only a trickle of current is drawn from the battery, thereby extending valuable standby time. Moreover, 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. 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® with a junction operating range from 40 to +125°C.
The MIC2238 is currently available in volume, with pricing starting at $1.70, for 1K quantities.
