A6269 Datasheet | Allegro MicroSystems

Features and Benefits - AEC-Q100 qualified - Total LED drive current up to 400 m A - Current shared equally up to 200 m A by 2 strings - 6 to 50 V supply - Low dropout voltage - LED output short-to-ground and thermal protection - On/off toggle switch input - Enable input for PWM control - Current slew rate limit during PWM - Current set by reference resistor - Automotive temperature range Applications: - Dome light, map light, space lighting, mood lighting Package: 8-pin SOICN with exposed thermal pad (suffix LJ) Not to scale Automotive LED Array Driver Description The A6269 is a linear, programmable current regulator providing up to 200 m A from each of two outputs to drive arrays of high brightness LEDs. The regulated LED current from each output, accurate to 5%, is set by a single reference resistor. Current matching in each string is better than 10% without the use of ballast resistors. Driving LEDs with constant current ensures safe operation with maximum possible light output. Output control is provided by an enable input, giving direct control for PWM applications, and by a debounced switch input, proving an on/off toggle action. Optimum performance is achieved driving 1 to 3 LEDs in each string: up to 2 strings at 200 m A each. Outputs can be connected in parallel or left unused as required. Short detection is provided to protect the LEDs and the A6269 during a short-to-ground at any LED output pin. The output will automatically resume the regulated current when the short is removed. A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds an adjustable thermal threshold. The device package is an 8-pin SOICN (LJ) with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating. A6269-DS, Rev. 11 MCO-0000581 Typical Application Diagram + Automotive 12 V power net PWM dimming input from LCU On/Off LA1 IREF LA2 THTH 200 m A 200 m A -...