Description

Four-String, White LED Driver for LCD Backlight Applications Features: White LED driver based on an inductive boost controller Wide input voltage range: 4.5V to 40 V Adaptive output voltage to minimize power dissipation Adjustable operating frequency: 200 kHz to 1.2 MHz Programmable UVLO Programmable soft start time for boost converter Programmable external MOSFET switching rising/falling time Drives up to 4 LED current sinks with internal MOSFETs Brightness control with PWM input Adjustable LED current: 40 mA to 200 mA Headroom control to maximize efficiency LED dimming frequency: up to 25 kHz PWM dimming at 300 Hz: 1000:1 Open-drain fault indicator LED open and LED short fault protection Thermal shutdown Undervoltage lockout (UVLO) 24-lead, 4 mm × 4 mm LFCSP