Description
The A8511 is a multioutput WLED/RGB driver for backlighting medium-size displays. It is a fully integrated high-brightness (HB) LED driver solution that does not require external power devices to complete the backlighting design criteria. The A8511 integrates FETs for a boost converter as well as four 150 mA current sinks, offering a complete integrated solution at HB LED current levels. LED channels can be tied together for up to 600 mA sink capability. It can work from a single power supply of 6.8 to 21 V and withstand up to 40 V. The boost converter is a constant frequency, current-mode converter.

Features and Benefits
▪ Four LED sinks rated for 150 mA each (600 mA total)
▪ Boost converter with integrated 40 V DMOS switch and OVP–load-dump protection
▪ 600 kHz to 2.2 MHz switching frequency—ability to operate above the AM band
▪ Internal bias supply for single-supply operation (VIN= 6.8 to 21 V)
▪ 3.5 μA shutdown current—limits battery drain
▪ Active current sharing between LED strings for 0.8% current matching and 0.7% accuracy
▪ PWM dimming with LED PWM duty cycle control
▪ 4000:1 dimming range
▪ Extensive fault mode protection schemes:
   ▫ Shorted LED protection against misconnected loads—with true output disconnect
   ▫ Open LED disconnect protects against LED failures
   ▫ External thermistor sensing to limit LED temperature
   ▫ Output overvoltage protection (OVP): 19.5 V default can be adjusted as high as 38 V
   ▫ Open Schottky and open OVP resistor protection against external component failure
   ▫ Input under- and overvoltage protection (UVLO and OVLO) against VIN variation
   ▫ Boost current limit, output short circuit limit, overtemperature protection (OTP), and soft start

Applications include:
▪ GPS navigation systems
▪ Automotive infotainment
▪ Back-up camera displays
▪ Cluster backlighting
▪ Portable DVD players
▪ Industrial LCD displays