© Semiconductor Components Industries, LLC, 2012

July, 2012 − Rev. 8

1

Publication Order Number:

CAT4101/D

CAT4101

1 A Constant-Current LED

Driver with PWM Dimming

Description

The CAT4101 is a constant−current sink driving a string of

high−brightness LEDs up to 1 A with very low dropout of 0.5 V at full

load. It requires no inductor, provides a low noise operation and

minimizes the number of components. The LED current is set by an

external resistor connected to the RSET pin. The LED pin is

compatible with high voltage up to 25 V, allowing the driving of long

strings of LEDs. The device ensures an accurate and regulated current

in the LEDs independent of supply and LED forward voltage

variation.

The PWM/EN input allows the device shutdown and the LED

brightness adjustment by using an external pulse width modulation

(PWM) signal.

The driver features a thermal shutdown protection that becomes

active whenever the die temperature exceeds 150

°C.

The device is available in a high−power, 5−lead TO−263 package

offering excellent thermal dissipation characteristics.

Features

Compliant

Applications

Figure 1. Typical Application Circuit

VIN

CAT4101

VCC

LEDs

549 W

3 V to 25 V

VIN

5 V

EN/PWM

RSET

LED

GND

ON

OFF

1 A

http://onsemi.com

(TO−263, 5 LEAD)

TV SUFFIX

CASE 418AH

PIN CONNECTIONS

MARKING DIAGRAM

(Top View)

Device

Package

ORDERING INFORMATION

CAT4101TV−T75

TO−263

(Pb−Free)

750 /

Tape & Reel

1

EN/PWM

VIN

GND

RSET

LED

TAB

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specification

Brochure, BRD8011/D.

CAT4101TV

XXXXXXXXX

1

CAT4101TV = Specific Device Code

XXXXXXXXX = Internal Traceability