CAT4004A
CAT4004A is Constant Current LED Driver manufactured by onsemi.
- Part of the CAT4002A comparator family.
- Part of the CAT4002A comparator family.
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 Lithium- ion battery due to the low dropout (50 m V at 20 m A) 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 SC- 70.
Features
- 2 and 4 LED Current Sinks with Tight Matching
- 32 Dimming Levels
- Low Dropout Driver 50 m V at 20 m A
- No Switching Noise
- Shutdown Current less than 1 m A
- LED Current set by External Resistor
- Dimming via 1- wire EZDim Interface
- Thermal Shutdown Protection
- 6- lead SC- 70, and 8- pad UDFN 2 mm x 2 mm Packages
- These Devices are Pb- Free, Halogen Free/BFR Free and are Ro HS pliant
Applications
- LCD Display Backlight
- Cellular Phones
- Digital Still Cameras
- Handheld Devices
2.4 V to
5.5 V
CIN 1 m F
20 m A LED1 LED2 LED3 LED4
One wire programming
RSET 3.74 k W
VIN EN/DIM RSET
CAT4004A GND
Figure 1. Typical Application Circuit
© Semiconductor ponents Industries, LLC, 2011
October, 2021
- Rev. 3
DATA SHEET .onsemi.
UDFN- 8 HU2G SUFFIX CASE 517AW
SC70- 6 SD SUFFIX CASE 419AD
PIN CONNECTIONS
1 EN/DIM
GND LED1...
