The SLA7024M, SLA7026M, and SMA7029M are designed for

high-efficiency and high-performance operation of 2-phase, unipolar

stepper motors. An automated, innovative packaging technology

combined with power FETs and monolithic logic/control circuitry ad-

vances power multi-chip modules (PMCMs™) toward the complete

integration of motion control. Highly automated manufacturing tech-

niques provide low-cost and exceptionally reliable PMCMs suitable for

controlling and directly driving a broad range of 2-phase, unipolar

stepper motors. The three stepper motor multi-chip modules differ

primarily in output current ratings (1.5 A or 3.0 A) and package style.

All three PMCMs are rated for an absolute maximum limit of 46 V

and utilize advanced NMOS FETs for the high-current, high-voltage

driver outputs. The avalanche-rated (

≥100 V) FETs provide excellent

ON resistance, improved body diodes, and very-fast switching. The

multi-chip ratings and performance afford significant benefits and

advantages for stepper drives when compared to the higher dissipation

and slower switching speeds associated with bipolar transistors.

Normally, heat sinks are not required for the SLA7024M or SMA7029M.

The SLA7026M, in demanding, higher-current systems designs,

necessitates suitable heat transfer methods for reliable operation.

Complete applications information is given on the following pages.

PWM current is regulated by appropriately choosing current-sensing

resistors, a voltage reference, a voltage divider, and RC timing net-

works. The RC components limit the OFF interval and control current

decay. Inputs are compatible with 5 V logic and microprocessors.

BENEFITS AND FEATURES

s Cost-Effective, Multi-Chip Solution

s ‘Turn-Key’ Motion-Control Module

s Motor Operation to 3 A and 46 V

s 100 V, Avalanche-Rated NMOS

s Low r

s Advanced, Improved Body Diodes

s Single-Supply Motor/Module

Operation

SMA7029M

HIGH-CURRENT PWM, UNIPOLAR STEPPER

MOTOR CONTROLLER/DRIVERS

Always order by complete part number:

Part Number

Package

Output Current

SLA7024M

18-Lead Power-Tab SIP

1.5 A

SLA7026M

18-Lead Power-Tab SIP

3.0 A

SMA7029M

15-Lead SIP

1.5 A

ABSOLUTE MAXIMUM RATINGS

at T

Load Supply Voltage, V

FET Output Voltage, V

Control Supply Voltage, V

Peak Output Current, I

SLA7024M . . . . . . . . . . . . . . . . . . . . . 3.0 A

SLA7026M . . . . . . . . . . . . . . . . . . . . . 5.0 A

SMA7029M . . . . . . . . . . . . . . . . . . . . 3.0 A

Continuous Output Current, I

OUT

SLA7024M . . . . . . . . . . . . . . . . . . . . . 1.5 A

SLA7026M . . . . . . . . . . . . . . . . . . . . . 3.0 A

SMA7029M . . . . . . . . . . . . . . . . . . . . 1.5 A

Input Voltage Range, V

Reference Voltage, V

Package Power Dissipation, P

Junction Temperature, T

+150

Operating Temperature Range,

T

Storage Temperature Range,

T

s Half- or Full-Step Unipolar Drive

s High-Efficiency, High-Speed PWM

s Dual PWM Current Control (2-Phase)

s Programmable PWM Current Control

s Low Component Count PWM Drive

s Low Internal Power Dissipation

s Heat Sinking (Normally) Unnecessary

s Electrically Isolated Power Tab

s Logic IC- and

µP-Compatible Inputs

s Machine-Insertable Package

REFERENCE A

Dwg. PK-007

OUT A

OUTB

SENSEA

GROUND A

+

OUTA

OUTB

GROUND B

REFERENCE B

CNTRL SPLY

IN A

IN B

SENSE B

OFF DELAYA

OFF DELAY B

™

SLA7024M, SLA7026M,

AND

SMA7029M