A6263: Protected LED Array Driver

Description

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

Top Features

  • 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A6263KLJTR-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
APEK6263KLJ-01-MH DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

Package