Low Voltage Stepper and Single/Dual DC Motor Driver

A3906

2

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Absolute Maximum Ratings

Characteristic

Symbol

Notes

Rating

Units

Load Supply Voltage

9.6

V

Logic Input Voltage Range

–0.3 to 7

V

Sense Voltage

Continuous

0.5

V

V

Output Current

May be limited by duty cycle, ambient

temperature, and heat sinking. Under

any set of conditions, do not exceed

the specified current rating or a junction

temperature of 150°C.

Continuous

1

A

Peak, DC < 30%

1.5

A

Output Current in Paralleled

Operation

Continuous

2

A

Peak, DC < 30%

2.5

A

Operating Temperature Range

Range S

–20 to 85

°C

Junction Temperature

150

°C

Storage Temperature Range

–40 to 150

°C

Selection Guide

Part Number

Packing

Package

A3906SES-T

92 pieces per tube

20-pin QFN with exposed thermal pad

A3906SESTR-T

1500 pieces per 7-in. reel

Characteristic

Symbol

Test Conditions*

Value Units

Package Thermal Resistance

4-layer PCB based on JEDEC standard

37

ºC/W

*Additional thermal information available on the Allegro website.

Terminal List Table

Number

Name

Function

1

CP2

Charge pump capacitor terminal 2

2

GND

Ground

3

SLEEP

Sleep logic input, active low

4

IN1

Control input

5

IN2

Control input

6

IN3

Control input

7

IN4

Control input

8

FL1

Current limit flag, bridge 1

9

FL2

Current limit flag bridge 2

10

OUT2A

DMOS full-bridge 2, output A

11

SENSE2

Current sense resistor terminal, bridge 2

12

OUT2B

DMOS full-bridge 2, output B

13

VBB

Supply Voltage

14

OUT1B

DMOS full-bridge 1, output B

15

SENSE1

Current sense resistor terminal, bridge 1

16

OUT1A

DMOS full-bridge 1, output A

17

VCP

Reservoir capacitor terminal

18

CP3

Charge pump capacitor terminal 3

19

CP1

Charge pump capacitor terminal 1

20

CP4

Charge pump capacitor terminal 4

–

PAD

Exposed pad for enhanced thermal performance

PAD

15

14

13

12

11

1

2

3

4

5

SENSE1

OUT1B

VBB

OUT2B

SENSE2

CP2

GND

SLEEP

IN1

IN2

Pin-out Diagram