Allegro MicroSystems A8501
The A8501 integrates a boost converter and four 100 mA current sinks. 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.| Part No. | A8501 |
|---|---|
| Datasheet | A8501 Download |
| Manufacturer |  Allegro MicroSystems |
| Description | 4 Channel x 100 mA WLED/RGB Driver |
| Buy | Stock & Price |
FEATURES AND BENEFITS
● 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)
● 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 □...
