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The A6272 is a linear programmable current controller capable of accurately regulating LED current in two strings with external MOSFETs. The LED current can be switched between high current and low current for stop/tail or DRL/position applications. The two LED current levels from each output are set by two sense resistors. Current reference accuracy for each string current is better than ±4%.
Driving LEDs with constant current ensures safe operation with maximum possible light output. ICs can be connected in parallel for larger lighting applications.
Drain short-to-ground detection is provided for both external MOSFETs. A6272 also offers MOSFET drain short-to-VIN and open-LED fault protection. The MODE pin controls the action of the IC in the case of a fault.
A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds a thermal threshold. An input voltage monitor is included to reduce LED current if VIN rises enough to exceed the set level.
The device is available in a 16-pin TSSOP (LP) and a 16-pin wettable flank TQFN (ES), both with exposed pad for enhanced thermal dissipation. Both packages are lead (Pb) free, with 100% matte-tin leadframe plating.