Vishay Siliconix

SiP12401

Document Number: 73193

S-71822-Rev. C, 03-Sep-07

www.vishay.com

1

Boost Controller For Double AA Cell or Li-Ion Battery

For White LED Application

FEATURES

•

Voltage Mode Control with Internal

Frequency Compensation

•

1.8 V to 5.0 V Input Voltage Range

•

PWM Control with 600 kHz Fixed

Switching Frequency

•

Analog Control of LED Intensity

•

Regulated Output Current

•

Integrated UVLO and Soft-Start

•

Logic Controlled Shutdown (< 1 µA)

•

High Efficiency: Typical 80 %

•

APPLICATIONS

•

White LED Backlighting

•

LCD Bias Supplies

•

Handheld Devices

•

Digital Cameras

•

Portable Applications

DESCRIPTION

SiP12401 is a boost controller IC for double cell NiMH or

Alkaline battery and Li Ion battery, which can drive white

LEDs connected in series to provide backlight in hand-held

devices. Series connection of the LEDs provides identical

LED currents resulting in uniform brightness and eliminating

the

need

for

ballast

resistors.

For

best

efficiency

performance, the SiP12401 is designed to operate in PWM

mode with 600 kHz switching. The voltage-mode PWM

design is internally compensated, reducing the external

parts count. It accepts input voltages from 1.8 V to 5.0 V. The

LED current can be adjusted externally for its brightness

control. SiP12401 features low shutdown current of under

1 µA.

SiP12401 is available in a lead (Pb)-free 6-pin, PowerPAK

MLP33 package and is specified to operate over the

industrial temperature range of - 40 °C to 85 °C.

TYPICAL APPLICATION CIRCUIT

XSHD

AGND

SiP12401

PGND

EXT

FB

1

3

4

6

2

5

22 µH

XSHD

10 µF

4.7 µF

MBR0520

15

Ω

Si2302ADS

RoHS

COMPLIANT