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