© Semiconductor Components Industries, LLC, 2010

March, 2010 − Rev. 2

1

Publication Order Number:

CAT4004/D

CAT4004

4-Channel Constant Current

LED Driver with EZDimt

Description

The CAT4004 provides four matched low dropout current sources to

drive LEDs. An external resistor on RSET sets the current in the LED

channels. Each LED channel includes an individual control loop

allowing the device to handle a wide range of LED forward voltages

while still maintaining tight current matching.

The EN/DIM logic inputs supports device enable and a digital

dimming interface for current setting of all LEDs. Six different current

dimming ratios are available.

The device is aimed at “direct drive” battery applications. It is

required that the battery or voltage source have enough headroom to

drive the LED forward voltage and current sink (>150 mV).

The device is available in a tiny 8−lead TDFN 2 mm x 3 mm

package with a max height of 0.8 mm.

Features

Compliant

Applications

Figure 1. Typical Application Circuit

CAT4004

VIN

EN/DIM

RSET

GND

LED1 LED2 LED3 LED4

RSET

3.8 kW

One wire

programming

20 mA

1 mF

2.4 V

to

5.5 V

http://onsemi.com

PIN CONNECTIONS

MARKING DIAGRAMS

FX = CAT4004VP2−T3

HA = CAT4004VP2−GT3

A = Assembly Location

XXX = Last Three Digits of Assembly Lot Number

Y = Production Year (Last Digit)

M = Production Month (1−9, A, B, C)

(Top View)

Device

Package

Shipping

ORDERING INFORMATION

CAT4004VP2−T3

(Note 1)

TDFN−8

(Pb−Free)

3,000/

Tape & Reel

1. Matte−Tin Plated Finish (RoHS−compliant).

2. NiPdAu Plated Finish (RoHS−compliant).

TDFN−8

VP2 SUFFIX

CASE 511AK

CAT4004VP2−GT3

(Note 2)

TDFN−8

(Pb−Free)

3,000/

Tape & Reel

LED3

RSET

VIN

LED2

LED1

GND

EN/DIM

LED4

1

FXA

XXX

YM

HAA

XXX

YM