4-Channel LED Driver with Phase Shift Control

The ISL97675 is an LED driver that drives 4 channels of low power LEDs from 4.5V to 26V input and up to 45V output.
The ISL97675 compensates for non-uniformity of the forward voltage drops in the LED strings with its 4 voltage controlled-current source channels. Its headroom control monitors the highest LED forward voltage string for output regulation, to minimize the voltage headroom and power loss in the typical multi-string operation.

Features
• 4 x 30mA Channels
• 45V Output Max
• 4.5V to 26V Input
• Channel Phase Shift PWM Dimming with 8-bit resolution
• 0.007% Direct PWM dimming at 200Hz
• Current Matching of ±1.5% from 1% ~ 100% Dimming
• Dynamic Headroom Control
• Protections
    - String Open/Short Circuit, VOUT Short Circuit Overvoltage, and Over-temperature Protections
    - Optional Master Fault Protection
• Selectable 600kHz or 1.2MHz Switching Frequency
• 20 Ld QFN 4mmx4mm Package

Applications*(see page 19)
• Netbook Displays LED Backlighting
• Notebook Displays LED Backlighting