SLA7024M, SLA7026M,
AND SMA7029M
HIGH-CURRENT PWM, UNIPOLAR STEPPER
MOTOR CONTROLLER/DRIVERS
The SLA7024M, SLA7026M, and SMA7029M are designed for
SMA7029M
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.
OUT
OFF DELAY
REFERENCE
A
A
A
A
A
A
A
V
REF
+
GROUND
IN
OUT
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.
SENSE
V
CC
CNTRL SPLY
SENSE
B
OUT
B
B
B
B
B
OFF DELAY
GROUND
REFERENCE
IN
+
V
REF
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.
OUT
B
Dwg. PK-007
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
BENEFITS AND FEATURES
Load Supply Voltage, V . . . . . . . . . . . . 46 V
■ Cost-Effective, Multi-Chip Solution
■ ‘Turn-Key’ Motion-Control Module
■ Motor Operation to 3 A and 46 V
■ 3rd Generation High-Voltage FETs
■ 100 V, Avalanche-Rated NMOS
■ Low rDS(on) NMOS Outputs
■ Advanced, Improved Body Diodes
■ Single-Supply Motor/Module
Operation
■ 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
BB
FET Output Voltage, V
. . . . . . . . . . . 100 V
DS
Control Supply Voltage, V . . . . . . . . . . 46 V
CC
Peak Output Current, I
(t ≤ 100 µs)
OUTM
w
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 . . . . -0.3 V to 7.0 V
IN
Reference Voltage, V
. . . . . . . . . . . 2.0 V
Always order by complete part number:
REF
Package Power Dissipation, P . See Graph
D
Part Number
Package
Output Current
Junction Temperature, T . . . . . . . . . +150°C
J
Operating Temperature Range,
SLA7024M
SLA7026M
SMA7029M
18-Lead Power-Tab SIP
18-Lead Power-Tab SIP
15-Lead SIP
1.5 A
3.0 A
1.5 A
T . . . . . . . . . . . . . . . . . . . . -20°C to +85°C
A
Storage Temperature Range,
T
. . . . . . . . . . . . . . . . . . -40°C to +150°C
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