The A6261 is a linear, programmable current regulator providing up to 100 mA from each of four outputs (LP and LY) 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. The A6261 in the LJ package offers two pins with 200 mA each channel (A6261LJ-1) and with 100 mA and 200 mA maximum output current (A6261LJ).
Output control is provided by an enable input, giving direct control for PWM applications. Outputs can be connected in parallel or left unused as required.
Short detection is provided to protect the LEDs and the A6261 during a short-to-ground at any LED output pin. An open LED in any of the strings disables all outputs, but can be overridden. Shorted LED output pins or open LEDs are indicated by a fault flag.
A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds a thermal threshold.
The device packages are an 8-pin SOICN (suffix LJ), a 10-pin MSOP (LY), and a 16-pin TSSOP (LP), all with exposed pad for enhanced thermal dissipation. They are lead (Pb) free, with 100% matte tin leadframe plating.