A6263 Datasheet, PDF (1/11 Pages) Allegro MicroSystems – Protected LED Array Driver

A6263
Protected LED Array Driver
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:
▪ Automotive interior and exterior lighting
Package: 8-pin SOICN with exposed
thermal pad (suffix LJ)
Not to scale
Description
TheA6263 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.
A6263-DS
Typical Application Diagram
Light Switch
+
Automotive
12 V power net
–
100 nF
VIN
A6263
IREF
THTH
LA1 ^{100 mA}
100 mA
LA2
100 mA
LA3
LA4 ^{100 mA}
PAD
GND
1 to 3 LEDs
in series
Figure 1. Typical application circuit