General Description

The MIC33153 is a high-efficiency 4MHz 1.2A synchronous buck regulator with an internal inductor, HyperLight Load™ mode, Power Good (PG) output indicator, and programmable soft start. HyperLight Load™ provides very high efficiency at light loads and ultra-fast transient response which makes the MIC33153 perfectly suited for supplying processor core voltages. An additional benefit of this proprietary architecture is very low output ripple voltage throughout the entire load range with the use of small output capacitors.

Features

• Internal inductor

− Simplifies design to two external capacitors

• Input voltage: 2.7V to 5.5V

• Output voltage: fixed or adjustable (0.62V to 3.6V)

• Up to 1.2 A output current

• Up to 93 peak efficiency

• 85 typical efficiency at 1mA

• Power Good (PG) output

• Programmable soft start

• 22µA typical quiescent current

• 4MHz PWM operation in continuous mode

• Ultra-fast transient response

• Low ripple output voltage

− 35mVpp ripple in HyperLight Load™ mode

− 7mV output voltage ripple in full PWM mode

• 0.01µA shutdown current

• Thermal shutdown and current limit protection

• 14-pin 3.0 x 3.5 x 1.1mm MLF® package

• –40°C to +125°C junction temperature range

Applications

• Solid State Drives (SSD)

• Mobile handsets

• Portable media/MP3 players

• Portable navigation devices (GPS)

• WiFi/WiMax/WiBro modules

• Wireless LAN cards

• Portable applications