Rev.1.0, Sep.19.2003, page 1 of 8

M54646AP

2-Phase Stepper Motor Driver

REJ03F0044-0100Z

Rev.1.0

Sep.19.2003

Description

The M54646AP is a semiconductor IC to drive bipolar stepper motors by controlling winding current with reference to

a designated current level.

Features

• Wide driver voltage range (10 – 40V)

• Wide output current control range (20 – 800mA)

• Bipolar and constant current control

• Built-in flywheel diode

• Built-in thermal protection circuit

Application

Office automation equipment such as printers, FDDs, HDDs and facsimiles

Function

M54646AP Integrated Circuit drives two-phase bipolar stepper motors while controlling winding current: It controls

winding current direction by inputting phases (pins 14 and 15) and, at the same time, controls winding current

amperage with terminals V

Provided with control circuits that output two phases, this IC is sufficient to drive a two-phase bipolar stepper motor.

Pin Configuration

Outline 28P4B

1

4

5

3

2

6

7

8

9

10

12

13

14

11

Ph1

GND

→

→

←

←

←

←

→

→

28

25

24

26

27

23

22

21

20

19

17

16

15

18

←

←

→

→

→

←

→

←

Ph2

GND

Comparator input (1)

Comparator reference

voltage input (1)

Output stage

supply voltage (1)

Output terminal (1)

Current sensor (1)

Output terminal (1)

Output current

direction switch

One-shot multi

time constant

Power supply (1)

Output stage

supply voltage (1)

Output terminal (2)

Output current

direction switch

One-shot multi

time constant

Power supply (2)

Output stage

supply voltage (2)

Comparator input (2)

Comparator reference

voltage input (2)

Output stage

supply voltage (2)

Output terminal (2)

Current sensor (2)