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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