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CAT4004A fiches techniques PDF

ON Semiconductor - Constant Current LED Driver

Numéro de référence CAT4004A
Description Constant Current LED Driver
Fabricant ON Semiconductor 
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CAT4004A fiche technique
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.
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 Lithiumion battery due to the
low dropout (50 mV at 20 mA) current sinks. The device is available
in the tiny 8pad UDFN 2 mm x 2 mm package with a max height of
0.55 mm, as well as the 6lead TSOT23 and SC70.
Features
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 mA
LED Current set by External Resistor
Dimming via 1wire EZDimt Interface
Thermal Shutdown Protection
6lead TSOT23, SC70, and 8pad UDFN 2 mm x 2 mm Packages
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
VIN
2.4 V
to
5.5 V
CIN
1 mF
20 mA
LED1 LED2 LED3 LED4
One wire
programming
RSET
3.74 kW
VIN
EN/DIM
RSET
CAT4004A
GND
Figure 1. Typical Application Circuit
http://onsemi.com
UDFN8
HU2G SUFFIX
CASE 517AW
TSOT236
TD SUFFIX
CASE 419AF
SC706
SD SUFFIX
CASE 419AD
PIN CONNECTIONS
1
EN/DIM
GND
LED1
LED2
VIN
RSET
LED4
LED3
CAT4004A
UDFN8
1
EN/DIM
LED1
GND
RSET
VIN LED2
CAT4002A
TSOT236
1
EN/DIM
RSET
VIN
CAT4002A
SC706
(Top Views)
LED1
GND
LED2
ORDERING INFORMATION
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

PagesPages 11
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