Low Voltage DC Motor Driver

A3918

2

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

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

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

A3918SESTR-T

1500 pieces per 7-in. reel

16-pin QFN with exposed thermal pad

Characteristic

Symbol

Test Conditions*

Value Units

Package Thermal Resistance

4-layer PCB based on JEDEC standard

42

ºC/W

*Additional thermal information available on the Allegro website.

Terminal List Table

Name

Number

Function

CP1

15

Charge pump capacitor terminal 1

CP2

1

Charge pump capacitor terminal 2

CP3

14

Charge pump capacitor terminal 3

CP4

16

Charge pump capacitor terminal 4

FL

7

Current limit flag

GND

2, 6, 8

Ground

IN1

4

Control input 1

IN2

5

Control input 2

OUTA

12

DMOS full-bridge output A

OUTB

10

DMOS full-bridge output B

PAD

–

Exposed thermal pad

SENSE

11

Current sense resistor terminal

¯S¯¯L¯¯E¯¯E¯¯P¯

3

Sleep logic input, active low

VBB

9

Supply Voltage

VCP

13

Reservoir capacitor terminal

Pin-out Diagram

PAD

12

11

10

9

1

2

3

4

OUTA

SENSE

OUTB

VBB

CP2

GND

SLEEP

IN1