8-Channel LED Driver

The ISL97636 is an integrated power LED driver that controls 8 channels of LED current for LCD backlight applications. The ISL97636 is capable of driving typically 72 (8x9) pieces of 3.5V/30mA or 80 (8x10) pieces of 3.2V/20mA LEDs. The ISL97636’s contains 8 channels of voltage controlled current sources with typical currents matching of ±1, which compensate for the non-uniformity effect of forward voltages variance in the LED stacks. To minimize the voltage headroom and power loss in the typical multi-strings operation, the ISL97636 features a dynamic headroom control that monitors the highest LED forward voltage string and uses its feedback signal for output regulation.

Features

• 8 Channels

• 6V to 24V Input

• 34.5V Output Max

• Drive Maximally 72 (3.5V/30mA each) or 80 (3.2V/20mA each) LEDs

• Current Matching ±1 Typ

• Dynamic Headroom Control

• PWM Signal up to 20kHz Dimming

• Protections

- String Open Circuit Detection

- String Short Circuit Detection with Selectable Thresholds

- Over-Temperature Protection

- Overvoltage Protection

- Optional Input Overcurrent Protection w/Disconnect SW

• 1.2MHz Switching Frequency

• 24 Ld 4mmx4mm QFN Package

• Pb-Free (RoHS compliant)

Applications

• Notebook Displays LED Backlighting

• LCD Monitor LED Backlighting

• Automotive Displays LED Backlighting

• Automotive or Traffic Lighting