Description
The A6269 is a linear, programmable current regulator providing
up to 200 mA from each of two outputs to drive arrays of high
brightness LEDs. 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.
Output control is provided by an enable input, giving direct
control for PWM applications, and by a debounced switch
input, proving an on/off toggle action.
Optimum performance is achieved driving 1 to 3 LEDs in
each string: up to 2 strings at 200 mA each. Outputs can be
connected in parallel or left unused as required.
Short detection is provided to protect the LEDs and the A6269
during a short-to-ground at any LED output pin. The output
will automatically resume the regulated current when the short
is removed.
A temperature monitor is included to reduce the LED drive
current if the chip temperature exceeds an adjustable thermal
threshold.
The device package is an 8-pin SOICN (LJ) with exposed pad
for enhanced thermal dissipation. It is lead (Pb) free, with 100%
matte tin leadframe plating.
A6269-DS, Rev. 7
Features and Benefits
AEC-Q100 qualified
Total LED drive current up to 400 mA
Current shared equally up to 200 mA by 2 strings
6 to 50 V supply
Low dropout voltage
LED output short-to-ground and thermal protection
On/off toggle switch input
Enable input for PWM control
Current slew rate limit during PWM
Current set by reference resistor
Automotive temperature range
Applications:
Typical Application Diagram
A6269
Automotive LED Array Driver
Dome light, map light, space lighting, mood lighting
+
–
LA1
VIN
Automotive
12 V power net
GND
PAD
LA2
SW
On/Off
200 mA
200 mA
IREF
THTH
A6269
PWM dimming
input from LCU
EN
Package: 8-pin SOICN with exposed
thermal pad (suffix LJ)
Not to scale
