A6263: Protected LED Array Driver

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The A6263 is a linear, programmable current regulator providing up to 100 mA from each of 4 outputs to drive arrays of high brightness LEDs. Outputs can be connected in parallel or left unused, as required. 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 IC provides protection against the following common faults:

  • LED string shorted to GND
  • Single or multiple LED short
  • LED string open
  • IC pin open/short
  • Overtemperature

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 leadframe plating.

Application

  • Automotive interior and exterior lighting
  • 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 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
  • Overtemperature protection with optional thermal derating function
  • Automotive temperature range
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