Linear Current Regulator and Controller

for Automotive LED Arrays

A6274, A6274-1

A6284, A6284-1

2

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristic

Symbol

Notes

Rating

Unit

VIN, OUT, DR, EN1, EN2, COMP, FFn

−0.3 to 45

V

GATE

Max of (–0.3 or

V

LED1 to LED6

−0.5 to 45

V

All other pins

−0.3 to 6.5

V

Junction Temperature

−40 to 150

°C

Transient Junction Temperature

Overtemperature event not exceeding 10 seconds, lifetime

duration not exceeding 10 hours, determined by design

characterization.

175

°C

Storage Temperature Range

−55 to 150

°C

3

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.

THERMAL CHARACTERISTICS

Characteristic

Symbol

Value

Unit

Junction-to-Ambient Thermal Resistance

Estimated, on 4-layer PCB based on JEDEC standard

29

°C/W

4

Additional thermal information available on the Allegro website.

SELECTION GUIDE

Part Number

FAULT Response

(see Table 2 for details)

Package

A6274KLPTR-T

60 mA per channel

Unlatched MODE0

20-pin eTSSOP with thermal pad 4,000 pieces per 13-in. reel

A6284KLPTR-T

120 mA per channel

Unlatched MODE0

A6274KLPTR-1-T

60 mA per channel

Latched MODE1

A6284KLPTR-1-T

120 mA per channel

Latched MODE1

1

SPECIFICATIONS

A GATE pin is provided to drive an external P-channel MOSFET,

whichservesasanactiveballastresistortoreducetheheatdissipation

within the IC package. It also serves as an input disconnect switch

in the event of an LED string short-to-ground fault.

The A6274 and A6284 provide a non-latching option while the

A6274-1 and A6284-1 provide a latching option.

DESCRIPTION (continued)