Micrel MIC2800-A4SYML

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.

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