These parts are no longer in production The device should not be purchased for new design applications. Samples are no longer available. The A8501 is a multi-output WLED/RGB driver for medium displays, integrating a boost converter and four 100mA current sinks (up to 400mA). It operates from 8V to 21V (40V withstand), features 2MHz switching for AM band avoidance, 1000:1 PWM dimming, output disconnect, and optional thermal limiting.
Product Details
Product Details
Top Features
- 600 kHz to 2.2 MHz switching frequency—ability to operate above the AM band
- Internal bias supply for single-supply operation (VIN = 8 to 21 V)
- Boost converter with integrated 40 V DMOS switch and OVP—load-dump protection
- 3.5 µA shutdown current—limits battery drain
- Active current sharing between LED strings for 0.8% current matching and 0.7% accuracy
- Drive up to 9 series LEDs in 4 parallel strings, 36 LEDs maximum (Vf = 3.5 V, If = 100 mA)
- LED sinks rated for 100 mA each (400 mA total)
- 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
