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CAT4003B, CAT4004B
Constant Current
Programmable LED Driver
with 32 Dimming Levels
Description
The CAT4003B and CAT4004B provide respectively three and four
matched low dropout current sources to drive LEDs. The CAT400XB
requires no external RSET resistor. The LED current is internally set
to 25 mA when the device is first enabled. 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
http://onsemi.com
matching.
The EN/DIM logic input supports the device enable and a digital
dimming interface for setting the LED channel current with 32 linear
dimming levels.
LEDs can be powered directly from a Lithium ? ion battery due to the
low dropout (75 mV at 20 mA) current sinks.
Package options are available in the 4 ? channel tiny 8 ? pad UDFN
2 mm x 2 mm with a max height of 0.55 mm, and 3 ? channel in the
6 ? lead TSOT ? 23, TSOP and SC ? 70.
Features
UDFN ? 8
HU2 SUFFIX
CASE 517AW
SC70 ? 6
SD SUFFIX
CASE 419AD
TSOT23 ? 6
TD SUFFIX
CASE 419AF
TSOP ? 6
TS SUFFIX
CASE 318G
? 3, 4 LED Current Sinks with Tight Matching
? 32 Dimming Levels
? Low Dropout Driver 75 mV at 20 mA
? No Switching Noise
? Shutdown Current less than 1 m A
? 25 mA Max LED Current per Channel
? Dimming via 1 ? wire EZDim Interface
? Thermal Shutdown Protection
? RoHS Compliant
? 6 ? lead TSOT ? 23, TSOP, SC ? 70, and 8 ? pad UDFN 2 mm x 2 mm
Packages
Typical Applications
? LCD Display Backlight
? Cellular Phones
? Digital Still Cameras
This document contains information on some products that are still under development.
ON Semiconductor reserves the right to change or discontinue these products without
notice.
TYPICAL APPLICATION CIRCUIT
VIN
2.4 V C IN
to
5.5 V 1 m F
LED1 LED2 LED3
VIN
CAT4003B
One Wire
Programming EN/DIM
32 Steps
GND
ORDERING INFORMATION
See detailed ordering information on page 2 of this data
sheet.
? Semiconductor Components Industries, LLC, 2011
January, 2012 ? Rev. 2
1
Publication Order Number:
CAT4003B/D
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