© Semiconductor Components Industries, LLC, 2010

January, 2010 − Rev. 5

1

Publication Order Number:

CAT3603/D

CAT3603

3-Channel LED Driver in

3 x 3 mm Package

Description

The CAT3603 is a charge pump LED driver operating in either 1x

(LDO) mode or 1.5x fractional mode regulating current through each

of the 3 LED pins. Operation at a constant switching frequency of

1 MHz allows the use of very small value ceramic capacitors.

The CAT3603 drives 3 white LEDs in parallel and provides tightly

matched regulated current to achieve uniform brightness in LCD

backlighting applications. An external resistor, RSET, controls the

output current level. The device can deliver up to 30 mA over an input

voltage supply range from 3 V to 5.5 V, making it ideal for battery−

powered applications.

LED dimming can be accomplished using several methods; using a

DC voltage to set the RSET pin current, applying a PWM signal on the

EN pin, or adding a switched resistor in parallel with RSET. The EN

input pin allows the device to be placed in power−down mode with

“near−zero” quiescent current.

The device is available in the tiny 12−lead thin DFN 3 mm x 3 mm

package with a max height of 0.8 mm.

Features

Compliant

Applications

http://onsemi.com

TDFN−12

HV2 SUFFIX

CASE 511AN

PIN CONNECTIONS

GND

C2+

C2−

C1−

LED1

LED2

LED3

RSET

HABB

MARKING DIAGRAM

Device

Package

Shipping

ORDERING INFORMATION

CAT3603HV2

TDFN−12

(Pb−Free)

Green*

2,000/Tape & Reel

HABB = CAT3603 Device Code

1

(Top View)

C1+

VIN

EN

VOUT

* Lead Finish Matte−Tin