General Description

The MIC2800 is a high performance power management IC, giving three output voltages with maximum efficiency. Integrating a 2MHz DC/DC converter with an LDO post regulator, the MIC2800 gives two high efficiency outputs with a second, 300mA LDO for maximum flexibility. The MIC2800 features a LOWQ? mode, reducing the total current draw while in this mode to less than 30μA. In LOWQ? mode, the output noise of the DC to DC converter is 75μVRMS, significantly lower than other converters which use a PFM light load mode that can interfere with sensitive RF circuitry.

特性 Features

? 2.7V to 5.5V input voltage range

? 2MHz DC/DC converter and two stand-alone LDOs

– LDO1: Low input voltage is powered directly from DC/DC converter for highest efficiency

? Integrated power-on reset (OR function for all outputs)

– Adjustable delay time

? LOWQ? mode

– 30μA Total IQ when in LOWQ? mode

? Tiny 16-pin 3mm x 3mm MLF? package

DC to DC Converter

? Output current to 600mA in PWM mode

? LOWQ? Mode: NO NOISE Light load mode

– 75μVRMS output noise in LOWQ? mode

? 2MHz PWM operation in normal mode

? >90 efficiency

LDOs

? LDO1 input voltage directly connected to DC/DC converter output voltage for maximum efficiency

– Ideal for 1.8V to 1.5V conversion

– 300mA output current from 1.8V input

– Output voltage down to 0.8V

? LDO2 – 300mA output current capable

? Thermal Shutdown Protection

? Current Limit Protection

Applications

? Mobile phones

? PDAs

? GPS receivers

? Digital still cameras

? Portable media players