SLA7024M, SLA7026M,
AND
SMA7029M
HIGH-CURRENT PWM, UNIPOLAR STEPPER
MOTOR CONTROLLER/DRIVERS
SMA7029M
1
Data Sheet
28201
OUTA
OFF DELAY A
REFERENCE A
GROUND A
IN A
OUT A
SENSE A
CNTRL SPLY
SENSE B
OUT B
OFF DELAY B
GROUND B
REFERENCE B
IN B
OUT B
V
REF
+
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.
CONTROL/LOGIC
V
REF
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Load Supply Voltage, V
BB
. . . . . . . . . . . .
46 V
FET Output Voltage, V
DS
. . . . . . . . . . .
100 V
Control Supply Voltage, V
CC
. . . . . . . . . .
46 V
Peak Output Current, I
OUTM
(t
w
≤
100
µs)
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
IN
. . . .
-0.3 V to 7.0 V
Reference Voltage, V
REF
. . . . . . . . . . .
2.0 V
Package Power Dissipation, P
D
.
See Graph
Junction Temperature, T
J
. . . . . . . . .
+150
°
C
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . . . . . .
-20
°
C to +85
°
C
Storage Temperature Range,
T
stg
. . . . . . . . . . . . . . . . . .
-40
°
C to +150
°
C
+
2
3
4
5
6
7
V
CC
8
9
10
11
12
13
14
15
CONTROL/LOGIC
Dwg. PK-007
BENEFITS AND FEATURES
s
s
s
s
s
s
s
s
Cost-Effective, Multi-Chip Solution
‘Turn-Key’ Motion-Control Module
Motor Operation to 3 A and 46 V
3
rd
Generation High-Voltage FETs
100 V, Avalanche-Rated NMOS
Low r
DS(on)
NMOS Outputs
Advanced, Improved Body Diodes
Single-Supply Motor/Module
Operation
s
s
s
s
s
s
s
s
s
s
Half- or Full-Step Unipolar Drive
High-Efficiency, High-Speed PWM
Dual PWM Current Control (2-Phase)
Programmable PWM Current Control
Low Component Count PWM Drive
Low Internal Power Dissipation
Heat Sinking (Normally) Unnecessary
Electrically Isolated Power Tab
Logic IC- and
µP-Compatible
Inputs
Machine-Insertable Package
Always order by complete part number:
Part Number
SLA7024M
SLA7026M
SMA7029M
™
Package
18-Lead Power-Tab SIP
18-Lead Power-Tab SIP
15-Lead SIP
Output Current
1.5 A
3.0 A
1.5 A
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
