AL8843QAUTOMOTIVE COMPLIANT 40V 3A STEP-DOWN LE D DRIVERDescriptionPin Assignments The AL8843Q is a hysteresis mode DC-DC step-down converter, (Top View) designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device can operate from an input supply between 4.5V and 40V and GND 1 8 SW provide an externally adjustable output current up to 3A. Depending upon supply voltage and external components, this converter can GND 2 7 SW provide up to 60W of output power. EP SET 3 6 VIN The AL8843Q integrates the power switch and a high-side output current sensing circuit, which uses an external resistor to set the NC 4 5 CTRL nominal average output current. SO-8EP Dimming can be realized by applying an external control signal to the CTRL pin. The CTRL pin wil accept either a DC voltage signal or a PWM signal. The soft-start time can be adjusted by an external capacitor from the Applications CTRL pin to Ground. Applying a voltage of 0.3V or lower to the CTRL • Automotive Daytime Running Lights
pin will shut down the power switch. • Automotive Front and Rear Fog Lights
The AL8843Q is available in the thermally enhanced SO-8EP package • Automotive Turn/Stop Lights
and automotive compliant, qualified to AEC-Q100 Grade 1, supports • Automotive Dimmable Interior Lights