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The AL5801 combines a 100V N-channel MOSFET with a prebiased NPN transistor to make a simple, small footprint LED driver. The LED current is set by an external resistor connected from REXT pin (4) to GND pin (6). The internal pre-biased transistor develops approximately 0.56V across the external resistor. The AL5801 open-drain output can operate from 1.1V to 100V enabling it to operate 5V to 100V power supplies without additional components. PWM dimming of the LED current can be achieved by driving the BIAS pin (1) with an external, open-collector NPN transistor or open-drain N-channel MOSFET. The AL5801 is available in a SOT26 package and is ideal for driving LED currents up to 350mA.
Feedback Pin Reference Voltage VRSET = 0.56V at +25°C
-40°C to +125°C Temperature Range
1.1V to 100V Open-Drain Output
Negative temperature VRSET co-efficient automatically reduces the LED current at high temperatures
Low thermal impedance SOT26 package with copper lead frame
Lead-Free Finish; RoHS Compliant
Halogen and Antimony Free. “Green” Device
Qualified to AEC-Q101 Standards for High Reliability