© Semiconductor Components Industries, LLC, 2010

March, 2010 − Rev. 4

1

Publication Order Number:

CAT32/D

CAT32

CMOS White LED Driver

Description

The CAT32 is a DC/DC step up converter that delivers a regulated

output current. Operation at a constant switching frequency of

1.2 MHz allows the device to be used with very small value external

inductor and ceramic capacitors.

The CAT32 is targeted to drive multiple white light−emitting diodes

(LEDs) connected in series and provides the necessary regulated current

controls the output current level. LED currents of up to 40 mA can be

supported over a wide range of input supply voltages from 2 V to 7 V,

making the device ideal for battery−powered applications.

A high voltage output stage allows up to 4 White LEDs to be driven

in series. Series drive provides inherent current matching.

LED dimming can be done by using a DC voltage, a logic signal, or

a pulse width modulation (PWM) signal. The shutdown input pin

allows the device to be placed in power−down mode with “near zero”

quiescent current.

In addition to overcurrent limiting protection, the device also

includes detection circuitry to ensure protection against open−circuit

load fault conditions.

The device is available in a low profile (1 mm max height) 6−lead

TSOT−23 package.

Features

Compliant

Applications

http://onsemi.com

TSOT−23

TD SUFFIX

CASE 419AF

PIN CONNECTIONS

LLYM

MARKING DIAGRAMS

Device

Package

Shipping

ORDERING INFORMATION

CAT32TDI−T3

TSOT−23

(Pb−Free)

3,000/

Tape & Reel

LL = CAT32TDI−T3

VF = CAT32TDI−GT3

Y = Production Year (Last Digit)

M = Production Month (1−9, A, B, C)

(Top View)

VIN

RSET

SW

GND

LED

1

SHDN

TSOT−23

1 mm Maximum Height

VFYM

1

CAT32TDI−GT3

TSOT−23

(Pb−Free)

3,000/

Tape & Reel