Description

TheA6263isalinear,programmablecurrentregulatorproviding

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.

A6263-DS

Features and Benefits

▪ 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

Applications:

Typical Application Diagram

A6263

Protected LED Array Driver

▪ Automotive interior and exterior lighting

A6263

LA1

VIN

Automotive

12 V power net

LA2

LA3

LA4

100 mA

1 to 3 LEDs

in series

100 mA

100 nF

100 mA

100 mA

IREF

THTH

Light Switch

+

–

GND

PAD

Package: 8-pin SOICN with exposed

thermal pad (suffix LJ)

Not to scale

Figure 1. Typical application circuit