A6262
Automotive LED Array Driver
Features and Benefits
Description
▪ Total LED drive current up to 400 mA
▪ Current shared equally up to 100 mA by up to 4 strings
▪ 6 to 50 V supply
TheA6262isalinear,programmablecurrentregulatorproviding
up to 100 mAfrom each of four outputs to drive arrays of high
brightnessLEDs.TheregulatedLEDcurrentfromeachoutput,
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.
▪ 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 K-temperature range (–40°C to 150°C)
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.
Optimumperformanceisachievedwhendriving4stringswith
1 to 3 LEDs in each string, at a total current of up to 100 mA
in each string. Outputs can be connected in parallel or left
unused as required.
Applications:
▪ Dome light, map light, space lighting,
mood lighting
Short detection is provided to protect the LEDs and theA6262
during a short-to-ground at any LED output pin. The output
will automatically resume the regulated current when the short
is removed.
Packages
10-pin MSOP with
exposed thermal pad
(suffix LY)
A temperature monitor is included to reduce the LED drive
current if the chip temperature exceeds an adjustable thermal
threshold.
16-pin TSSOP with
exposed thermal pad
(suffix LP)
The device packages are a 10-pin MSOP (LY) and a 16-pin
TSSOP (LP), both with exposed pad for enhanced thermal
dissipation. They are lead (Pb) free, with 100% matte tin
leadframe plating.
Not to scale
Typical Application Diagram
+
Automotive
12 V power net
VIN
A6262
PWM dimming
input from LCU
LA1
LA2
LA3
LA4
EN
SW
IREF
On/Off
THTH
GND
–
A6262-DS, Rev. 4