A6263KLJTR-T Datasheet A6263KLJTR-T | P1-P3

Description

The A6263 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, Rev. 1

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

IREF

THTH

Light Switch

–

GND

PAD

Package: 8-pin SOICN with exposed

thermal pad (suffix LJ)

Not to scale

Figure 1. Typical application circuit

Protected LED Array Driver

A6263

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Absolute Maximum Ratings*

Characteristic Symbol Notes Rating Unit

Input Supply Voltage V

–0.3 to 50 V

Pins LA1 through LA2 –0.3 to 50 V

Pins IREF and THTH –0.3 to 6.5 V

Ambient Operating Temperature

Range

K temperature range –40 to 125 °C

Maximum Continuous Junction

Temperature

(max) 150 °C

Transient Junction Temperature T

Overtemperature event not exceeding 10 s, lifetime duration

not exceeding 10 h, guaranteed by design characterization

175 °C

Storage Temperature Range T

stg

–55 to 150 °C

*Stresses beyond those listed in this table may cause permanent damage to the device. The Absolute Maximum ratings are stress ratings only,

and functional operation of the device at these or any other conditions beyond those indicated in the Electrical Characteristics table is not implied.

Exposure to Absolute Maximum-rated conditions for extended periods may affect device reliability.

Selection Guide

Part Number

Ambient Operating

Temperature, T

(°C)

Packing* Package

A6263KLJTR-T –40 to 125 3000 pieces per 13-in. reel 8-pin SOICN with exposed thermal pad

*Contact Allegro

™

for additional packing options.

Thermal Characteristics*may require derating at maximum conditions, see application section for optimization

Characteristic Symbol Test Conditions* Value Unit

Package Thermal Resistance

(Junction to Ambient)

θJA

On 4-layer PCB based on JEDEC standard 35 ºC/W

On 2-layer generic test PCB with 0.8 in.

of copper area each side 62 ºC/W

Package Thermal Resistance

(Junction to Pad)

θJP

2 ºC/W

*Additional thermal information available on the Allegro website.

Protected LED Array Driver

A6263

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Terminal List Table

Number Name Function

1 THTH

Thermal Threshold. Short this pin to ground to disable

thermal derating feature, or leave open to enable. (Thermal

shutdown function is always enabled.)

2 IREF

Connect a reference resistor between this pin and GND to

set the LED current.

3 LA1 LED anode (+) connection 1*

4 LA2 LED anode (+) connection 2*

5 LA3 LED anode (+) connection 3*

6 LA4 LED anode (+) connection 4*

7 VIN

Input power to the IC. All LED current sources are enabled

while V

is above UVLO level. Decouple with a 0.1 µF

capacitor to GND near the IC.

8 GND

IC ground reference. Connect to ground plane(s) of the

PCB using the shortest path possible.

– PAD

Exposed pad of the package providing enhanced thermal

dissipation. This pad must be connected to the ground

plane(s) of the PCB with at least 8 vias located directly in

the solder land for the pad.

* If any LAx pin is unused, tie it to the VIN pin. Do not leave it open or shorted to GND.

LA1

VIN

Current

Regulators

GND

PAD

Thermal

Monitor

Current Reference

LA2

LA3

LA4

THTH

REF

Control

IREF

Overtemperature

LED Open

LED String

Short to GND

Fault

Control

Functional Block Diagram

Pin-out Diagram

PAD

THTH

IREF

LA1

LA2

GND

VIN

LA4

LA3

P1-P3 P4-P6 P7-P9 P10-P11

A6263KLJTR-T

Mfr. #:

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Description:

IC LED DRIVER LINEAR 100MA 8SOIC

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A6263KLJTR-T