A6261KLPTR-T Allegro Microsystems Inc, A6261KLPTR-T Datasheet

A6261KLPTR-T

Manufacturer Part Number

A6261KLPTR-T

Description

A6261/2/4 Four Channel Constant Current LED Drivers

Manufacturer

Allegro Microsystems Inc

Datasheets

1.A6261KLPTR-T.pdf (14 pages)

2.A6261KLPTR-T.pdf (15 pages)

3.A6261KLPTR-T.pdf (15 pages)

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Features and Benefits

▪ 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

▪ Low dropout voltage

▪ LED output short-to-ground and thermal protection

▪ Disable on open LED detection option

▪ Enable input for PWM control

▪ Current slew rate limit during PWM

▪ Current set by reference resistor

▪ Automotive K-temperature range version (–40°C to 150°C):

Packages

A6261A-DS, Rev. 1

contact factory for availability

exposed thermal pad

10-pin MSOP with

(suffix LY)

Not to scale

PWM dimming input

Power input

exposed thermal pad

16-pin TSSOP with

(suffix LP)

–

Typical Application Diagram

IREF

THTH

A6261

GND

VIN

Description

The A6261 is a linear, programmable current regulator providing

up to 100 mA from each of four 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. Outputs can be connected in

parallel or left unused as required.

Short detection is provided to protect the LEDs and the A6261

during a short-to-ground at any LED output pin. An open LED

in any of the strings disables all outputs, but can be overridden.

Shorted LED output pins or open LEDs are indicated by a

fault flag.

A temperature monitor is included to reduce the LED drive

current if the chip temperature exceeds a thermal threshold.

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.

LA1

LA2

LA3

LA4

Protected LED Array Driver

A6261

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