3-Channel Constant Current LED Driver

with Programmable PWM Control

A6281

2

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

bus, thus eliminating the need for a separate chip supply bus or an

external regulator.

Applications include:

▪ Colored, large-character LED signs

▪ Scrolling, colored marquees

▪ Architectural lighting

▪ High intensity monochrome displays

▪ Large video and graphic displays

The A6281 is supplied in a 3 mm × 3 mm 16-terminal QFN (suffix

‘ES’) package, with 0.75 mm nominal overall height. The package

is lead (Pb) free with 100% matte-tin leadframe plating.

Part Number

Packing*

Mounting

A6281EESTR-T

1500 pieces/reel

16 terminal QFN

*Contact Allegro for additional packing options.

Selection Guide

Absolute Maximum Ratings

Characteristic

Symbol

Notes

Rating

Units

Load Supply Voltage

17

V

Output Voltage

OUT0, OUT1, OUT2

–0.5 to 17

V

Output Current

170

mA

Ground Current

600

mA

VREG Pin

6V

Logic Outputs

CO, LO, OEO, SDO

7

V

Logic Input Voltage Range

CI, LI, OEI, SDI

–0.3 to 7

V

Operating Ambient Temperature

Range E

–40 to 85

ºC

Maximum Junction Temperature

150

ºC

Storage Temperature

–55 to 150

ºC

Description (continued)

Thermal Characteristics

Characteristic

Symbol

Test Conditions*

Rating Units

Package Thermal Resistance

4-layer PCB based on JEDEC standard

47

ºC/W

*For additional information, refer to the Allegro website.

25

50

75

100

125

150

Temperature (°C)

4500

4000

3500

3000

2500

2000

1500

1000

500

0

(R

ºC/W)

4 layer

PCB

Power Dissipation versus Ambient Temperature