A8500

A8500 Flexible WLED/RGB Backlight Driver for Medium Size LCDs 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 25 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 PACKAGE: 26 pin QFN/MLP (suffix EC) 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 currentmode converter. Each LED channel can sink 25 mA, and channels can be paralleled for higher currents. Flexible dimming allows output channels to ei...