ALLEGRO A6263KLJTR-T

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.

The A6263 is a linear current regulator that is designed to provide drive current and protection for parallel strings of series - connected high brightness LEDs. It provides up to 4 matched programmable current outputs at up to 100 mA, with low minimum dropout voltages below the main supply voltage. For 12 V power net applications, optimum performance is achieved when driving 4 strings of 1 to 3 LEDs, at current up to 100 mA per string. Current regulation is maintained and the LEDs protected during a short - to - ground at any point in the LED string. A short - to - ground on any regulator output terminal disables that offending string only. Similarly, in the case of an open output pin or an open - LED fault, all other LED strings remain in regulation. Individual outputs can be disabled by connecting the output to VIN. Multiple outputs can be connected in parallel to drive higher current LED strings. Integrated thermal management reduces the regulated current level at high internal junction temperatures to limit power dissipation. This thermal threshold is programmable and can be disabled if necessary.

• 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

• Automotive interior and exterior lighting