Description
Constant Current LED Driver with 32 Dimming Levels and Rset CAT4002A, CAT4004A .
The CAT4002A and CAT4004A provide respectively two and four
matched low dropout current sources to drive LEDs.
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 1
* wire EZDim Interface
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
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