NIDEC COPAL ELECTRONICS CORP.

, 20

Rev.

1

Publication Order Number:

W-52/

W-52

CMOS White LED Driver

Description

The W-52 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 W-52 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

Low Quiescent Ground Current (0.5 mA Typical)

Power Efficiency Over 80%

Compatible Pinout with LT1932

Adjustable Output Current (up to 40 mA)

High Frequency 1.2 MHz Operation

Input Voltage Operation down to 2.0 V

Low Resistance (0.5

) High Voltage Power Switch

Drives up to 4 White LEDs in Series

Shutdown Current Less than 1 A

Load Fault Protection Against Open circuits

Low Value External Components

Low Profile (1 mm) TSOT 23 6 lead Package

These Devices are Pb Free, Halogen Free/BFR Free and are RoHS

Compliant

Applications

Color LCD and Keypad Backlighting

Cellular Phones

Handheld Terminals

Digital Cameras

PDAs/Games

Portable MP3 Players

TSOT 23

PIN CONNECTIONS

MARKING DIAGRAMS

Device

Package

Shipping

ORDERING INFORMATION

W-52TDI

T3

TSOT 23

(Pb Free)

3,000/

Tape & Reel

VF = W-52TDI GT3

Y = Production Year (Last Digit)

M = Production Month (1 9, A, B, C or O, N, D)

(Top View)

VIN

RSET

SW

GND

LED

1

SHDN

TSOT 23

1 mm Maximum Height

VFYM

1

(Note 1)

1. NiPdAu Plated Finish (RoHS compliant).