Description
The A8500 is a multi-output WLED driver for medium display backlighting. The A8500 integrates a boost converter and eight current-sinks to provide a flexible 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. The A8500 can support any application requiring 4 to 96 WLEDs. The boost converter is a constant frequency current-mode converter.

FEATUREs and Benefits
▪  Active current sharing between LED strings for ±1.5% typical current matching and ±1.2% typical accuracy
▪  Drive up to 12 series × 8 parallel = 96 LEDs (Vf = 3.2 V, If = 20 mA)
▪  Flexible dimming, using alternative methods:
   ▫  LED duty cycle control (PWM pin)
   ▫  DC current using serial programming (EN pin)
   ▫  DC current using external PWM signal (APWM pin)
   ▫  An external resistor
▪  Boost converter with integrated 50 V, 2 A DMOS
▪  LED sinks rated for 30 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

APPLICATIONs include:
▪  Thin notebook displays
▪  LCD TV
▪  RGB backlight
▪  GPS systems
▪  Portable DVD players