Description

The A8504 is a multi-output WLED driver for medium display backlighting. The A8504 integrates a boost converter and eight current-sinks to provide a WLED/RGB backlight driver. The boost converter can provide output voltage up to 47 V. The flexible channel selection control and high voltage capability allow a wide range of LED backlight applications.

▪ Thin notebook displays

▪LCD TV

▪RGB backlight

▪GPS systems

▪ Portable DVD players

Features and Benefits

▪ Active current sharing between 6 LED strings for ±1.3 typical current matching

▪ ±1.2 typical current accuracy

▪ Drive up to 11 series × 8 parallel = 88 LEDs (Vf = 3.5 V, If = 40 mA)

▪ External PWM control for LED dimming

▪ An external resistor for LED current setting

▪ Boost converter with integrated 50 V, 2 A DMOS

▪ LED sinks rated for 45 mA

▪ 200 kHz to 2 MHz switching frequency

▪ Open LED disconnect

▪ Boost current limit, thermal shutdown, and soft start

▪ No audible ceramic capacitor noise during PWM dimming

▪ Adjustable overvoltage protection (OVP)

▪ No pull-up resistors required for LED modules that use ESD capacitors