The AAT2403 is a highly integrated, high efficiency white LED backlight driver for large size LCD panels used in LCD TVs. It operates from a regulated 12V or 24V DC power supply.

Sixteen precision current sinks provide up to 100mA /channel, constant current drive for up to 160 white LEDs. Feedback from each of the current sinks is fed back to the external power supply to ensure the optimum voltage is applied to the LED strings. Depending upon system configuration and the number of LEDs/string, this could be a step-up or step-down converter.

A high speed, SPI compatible interface allows fast, independent digital control of each current sink programmed to a maximum value using an external resistor. An 8-Bit Dot Correction register compensates for variations in LED brightness during LCD setup, while two 12-Bit registers control the grayscale current and delay time. Channel ON/OFF control is also included. A 4- Bit register allows up to 256 LED strings to be controlled in a single system.

The Grayscale PWM clock is internally generated or can be externally supplied. Fault handling and detailed reporting is handled by the SPI bus while a fault is indicated via a fault pin. The system monitors open or short circuit LEDs, and over-voltage, over-current and over-temperature protection.

The AAT2403 is available in a Pb-free, thermally enhanced 42-pin 5x6mm TQFN package.