General Description

The Micrel MIC2827 is a three output, programmable Power Management IC, optimized for high efficiency power support in Mobile Application Processors, CoProcessors, DSPs, GPS and Media Player chipsets. The device integrates a single 500mA PWM/PFM synchronous buck (step-down) regulator with two Low Dropout Regulators and a 400kHz I²C interface that provides programmable Dynamic Voltage Scaling (DVS), Power Sequencing, and individual output Enable/Disable controls allowing the user to optimally control all three outputs.

Features

• Fast-mode I2C control interface

• Tiny 14-pin 2.5mm x 2.5mm MLF® package

• Default start-up voltage states and sequencing

• Fault indication processor flag - IRQb

• -40°C to 125°C junction temperature range

• Thermal shutdown and current-limit protection

• Power On After Fault (POAF) function

DC-DC Synchronous Buck

• 2.7V to 5.5V input voltage range

• 500mA continuous output current

• HyperLight Load™ mode

– 25µA quiescent current

• 90 peak efficiency; 85 at 1mA

• Ultra-fast transient response

• Dynamic Voltage Scaling (DVS) range: 0.8V to 1.8V

– 0.8V to 1.2V in 25mV steps

– 1.2V to 1.8V in 50mV steps

• ±3 over temperature

• Low output voltage ripple: 20mVpp in HyperLight Load™ mode, 3mV in full PWM mode

LDOs

• 1.8V to VDVIN input voltage range

• 150mA output current (each LDO)

• Dynamic Voltage Scaling (each LDO)

– DVS range: 0.8V to 3.3V in 50mV steps

• ±3 over temperature

• Low quiescent current – 50µA (each LDO)

• Low dropout voltage – 50mV @ 50mA

• Low output noise - 45µVRMS

• Stable with ceramic output capacitors

• 65dB PSRR at 1kHz

Applications

• Application processors

• GPS subsystems

• General purpose PMIC

• Mobile phones / PDAs

• Portable media players

• Mobile television receivers