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Allegro LED driver IC eyes automotive lighting

02 Apr 2013

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Allegro A6263

The automotive qualified LED driver IC family of Allegro MicroSystems Inc. has been expanded. The linear, programmable current regulator A6263 drives arrays of high brightness LEDs by providing up to 100mA from each of four outputs. The LED driver IC is ideal for automotive map and dome lighting, as well as exterior accent lighting.

The device outputs can be connected in parallel or left unused as required. The regulated LED current from each output is set by a single reference resistor. 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. 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
  • Over temperature

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 de-rating threshold can be adjusted or disabled.

Allegro's A6263KLJTR-T is offered in an 8-pin SOICN package (suffix LJ) with exposed thermal pad for enhanced thermal dissipation. It is priced at $0.66 in quantities of 1,000.




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