PS0021

High Efficiency PFM Step-up

DC/DC Converter

DESCRIPTION

FEATURES

PFM control Asynchronous Booster

The PS0021 compact, high-efficiency, step-up DC-

DC converters are available in tiny, 3-pin thin

SOT23 and 6-pin thin SOT26 packages. They

feature an extremely low 5µA quiescent supply

current to ensure the highest possible light-load

efficiency. Optimized for operation from one to two

alkaline or nickel-metal-hydride (NiMH) cells, or a

single Li+ cell, these devices are ideal for

applications where extremely low quiescent current

and ultra-small size are critical.

Up to 90% Efficiency

Quiescent Supply Current: 5µA

Zero Shutdown current

Output Voltage Accuracy: ±1%

Fixed Output Voltage

Provides 20mA from single AAA cell

Input Voltage Range: 0.8V to 5.5V

Startup Voltage : 0.9V

3L SOT-23 and 6L SOT-26 Package

APPLICATIONS

The PS0021 also feature proprietary noise-

reduction

circuitry,

which

suppresses

electromagnetic interference (EMI) caused by the

inductor in many step-up applications. The family

offers different combinations of fixed outputs,

shutdown, and EMI reduction (see Selector Guide).

Wireless mice, keyboard

Pagers

Remote Controls

Wireless Headsets

Wireless Transmitters

Personal Medical Devices

Digital Still Cameras

Its unique design is optimized for high efficiency at

light load condition.

MP3/MP4 Players

Single-Cell Battery-Powered Devices

Low-Power Hand-Held Instruments

TYPICAL APPLICATION CIRCUIT

July 2007

www.picsemi.com

© 2007 Power IC. All Rights Reserved.

1