A8504EECTR-T Datasheet PDF - Allegro MicroSystems

●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