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Power management IC provides three output voltages

Posted: 08 May 2006     Print Version  Bookmark and Share

Keywords:MIC2800  power management IC  DC/DC regulator  LDO  low dropout regulator 

Micrel Inc. has launched the MIC2800, a power management IC that provides three output voltages and a power-on-reset in a 3-by-3mm MLF-16 package. The solution suits cell phones, smart phones, PDAs, cameras, portable media players, WLAN cards and Bluetooth applications. The MIC2800 is currently available in volume and pricing starts at Rs.100.69 ($2.25) for 1,000-unit quantity.

The MIC2800 features an input range of 2.7V to 5.5V, and three voltage outputs. The first output is a high-frequency DC/DC switching regulator for up to 600mA while the second and third are low dropout linear regulators. One of the linear regulators works from a low input voltage, allowing it to post-regulate the switching regulator.

According to Ralf Muenster, Micrel's director of marketing for power products, the product is also suitable for powering a baseband processor core and I/O rails as well as providing a higher low noise analogue voltage using the third output.

The DC/DC converter is said to provide virtually no noise in light load mode and 75μVRMS output noise in LOWQ mode. The solution operates at 2MHz pulse-width modulation in normal mode, over 93 per cent efficiency and requires a 2.2μF output capacitor and a 2.2μH inductor for stability. The part also integrates a POR circuit that monitors all three output voltages.

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