Allegro MicroSystems' A6263 is a linear, programmable current regulator providing up to 100 mA from each of four outputs to drive arrays of high brightness LEDs. Outputs can be connected in parallel or left unused, as required. A single reference resistor sets the regulated LED current from each output. Current is matched in each string without the use of ballast resistors. Driving LEDs with constant current ensures safe operation with maximum possible light output.
If one LED string is open or shorted to ground, the offending string is disabled, while other LED strings continue to work. A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds a thermal threshold. If necessary, this thermal derating threshold can be adjusted or disabled.
The device comes in an 8-pin SOIC (package LJ) with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin lead-frame plating.
- AEC-Q100 qualified
- Total LED drive current up to 400 mA
- Current shared equally up to 100 mA by up to 4 strings
- Wide input voltage range of 6 V to 50 V for start/stop, cold crank, and load dump requirements
- Low dropout voltage
- LED current levels set by single reference resistor
- LED string shorted to GND protection
- Over-temperature protection with optional thermal derating function
- Automotive temperature range
- Automotive lighting applications:
- Interior map lighting
- Interior dome lighting
- Exterior accent lighting