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CAT4002A, CAT4004A
Constant Current LED
Driver with 32 Dimming
Levels and Rset
Description
The CAT4002A and CAT4004A provide respectively two and four
matched low dropout current sources to drive LEDs. The CAT400XA
uses an external resistor RSET to set 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.
http://onsemi.com
The EN/DIM logic inputs supports 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 (50 mV at 20 mA) current sinks. The device is available
in the tiny 8 ? pad UDFN 2 mm x 2 mm package with a max height of
0.55 mm, as well as the 6 ? lead TSOT ? 23 and SC ? 70.
Features
UDFN ? 8
HU2G SUFFIX
CASE 517AW
SC70 ? 6
SD SUFFIX
CASE 419AD
TSOT23 ? 6
TD SUFFIX
CASE 419AF
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2 and 4 LED Current Sinks with Tight Matching
32 Dimming Levels
Low Dropout Driver 50 mV at 20 mA
No Switching Noise
Shutdown Current less than 1 m A
LED Current set by External Resistor
Dimming via 1 ? wire EZDim t Interface
Thermal Shutdown Protection
6 ? lead TSOT ? 23, SC ? 70, and 8 ? pad UDFN 2 mm x 2 mm Packages
These Devices are Pb ? Free, Halogen Free/BFR Free and are RoHS
Compliant
PIN CONNECTIONS
1
EN/DIM VIN
GND RSET
LED1 LED4
LED2 LED3
CAT4004A
UDFN ? 8
1
EN/DIM LED1
GND RSET
Applications
? LCD Display Backlight
? Cellular Phones
? Digital Still Cameras
? Handheld Devices
VIN
CAT4002A
TSOT23 ? 6
LED2
V IN
2.4 V
to
5.5 V
C IN
1 m F
20 mA
EN/DIM
RSET
1
LED1
GND
LED1 LED2 LED3 LED4
VIN
LED2
One wire
programming
RSET
3.74 k W
VIN
EN/DIM
RSET
CAT4004A
GND
CAT4002A
SC70 ? 6
(Top Views)
ORDERING INFORMATION
Figure 1. Typical Application Circuit
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
? Semiconductor Components Industries, LLC, 2011
June, 2011 ? Rev. 2
1
Publication Order Number:
CAT4002A/D
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