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