MIC23031

4MHz PWM 400mA Buck Regulator with

HyperLight Load

™

HyperLight Load is a trademark of Micrel, Inc

MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc.

General Description

The MIC23031 is a high-efficiency 4MHz 400mA

synchronous buck regulator with HyperLight Load™ mode.

HyperLight Load™ provides very-high efficiency at light

loads and ultra-fast transient response which is 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. The tiny 1.6mm x 1.6mm Thin

MLF

only three external components.

The MIC23031 is designed for use with a very-small

inductor, down to 0.47µH, and an output capacitor as small

as 2.2µF that enables a sub-1mm height.

The MIC23031 has a very-low quiescent current of 21µA

and achieves as high as 88% efficiency at 1mA. At higher

loads, the MIC23031 provides a constant switching

frequency around 4MHz while achieving peak efficiencies

up to 93%.

The MIC23031 is available in a 6-pin 1.6mm x 1.6mm Thin

MLF

range from –40

°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• Input voltage: 2.7V to 5.5V

• 400mA output current

• Up to 93% efficiency and 88% at 1mA

• 21µA typical quiescent current

• 4MHz PWM operation in continuous mode

• Ultra-fast transient response

• Low voltage output ripple

–

20mVpp ripple in HyperLight Load™ mode

–

3mV output voltage ripple in full PWM mode

• 0.01µA shutdown current

• Fixed and adjustable output voltage options available

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

Applications

• Mobile handsets

• Portable media/MP3 players

• Portable navigation devices (GPS)

• WiFi/WiMax/WiBro modules

• Digital Cameras

• Wireless LAN cards

• USB-powered devices

• Portable applications

Typical Application

October 2010

M9999-102210-A