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SLA7075M, SLA7076M,
SLA7077M, and SLA7078M
Motor Driver IC Family
The SLA7075M, SLA7076M, SLA7077M, and SLA7078M motor driver
ICs feature 2-phase stepper unipolar drivers. The clock-in type input interface
allows simplified control logic, and options for built-in sense current detection
and load circuit short or open protection (patent pending) provide lower loss,
and lower thermal resistance. All products in the SLA7070M series are pin-
compatibile, supporting rapid design of application variants.
The built-in excitation distribution circuit (sequencer) allows motor control
using only the CLOCK signal for simple operations (rotate/stop), with motor
speed control by frequency input into CLOCK pin. This eliminates logic signal
lines required for conventional phase-input methods, and reduces demand on
heavily-used CPUs.
Contact Allegro® for application information and additional information on
device performance and logic.
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
AT TA = 25°C
Load (Motor) Supply Voltage, VM .........46 V
Main Power Supply Voltage, VBB..........46 V
Logic Supply Voltage, VDD ...........................7 V
Output Current, IOUT
SLA7075M .................................1.0 A
SLA7076M .................................1.5 A
SLA7077M .................................2.0 A
SLA7078M .................................3.0 A
Logic Input Voltage, VIN
.............................. –0.3 to VDD+0.3 V
REF Input Voltage, VREF
............................................–0.3 to VDD+0.3 V
Sense Voltage, VSInt
tw < 1 μs is not considered.......... ±2 V
Power Dissipation, PD
Without heat sink ...................... 4.7 W
Junction Temperature, TJ.......................150°C
Ambient Temperature, TA....... –20 to 85°C
Storage Temperature, Tstg ... –30 to 150°C
FEATURES AND BENEFITS
Features
„ Power supply voltages, VBB: 46 V(max.), 10 to 44 V normal operating range
„ Logic supply voltages, VDD: 3.0 to 5.5 V
„ Maximum output currents: 1 A, 1.5 A, 2 A, 3 A
„ Built-in sequencer
„ Simplified clock-in stepping control
„ Microstepping at full-, half-, quarter-, eighth-, and sixteenth-steps
„ Built-in sense resistor, RSInt
„ All variants are pin-compatible for enhanced design flexibility
„ ZIP type 23-pin molded package (SLA package)
„ Self-excitation PWM current control with fixed off-time; off-time adjusted
automatically by step reference current ratio (3 levels)
„ Built-in synchronous rectifying circuit reduces losses at PWM off
„ Synchronous PWM chopping function prevents motor noise in Hold mode
„ Sleep mode for reducing the IC input current in stand-by state
„ Built-in protection circuitry against motor coil opens/shorts option available
Sanken Power Devices
from Allegro MicroSystems

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SLA7075M, SLA7076M,
SLA7077M, and SLA7078M
Motor Driver ICs
PART NUMBERS AND OPTIONS
The following are the product variants and optional features
available for these variants of the SLA7070M series.
Not all combinations of standard models and product op-
tions are available in high-volume production quantities. For
information on product availability, and assistance with deter-
mining the IC features that are the best fit for your application,
please contact our sales office or representative.
NOTE
The following abbreviations are used throughout this
document to refer to product variants:
PR – Product with both Protection Circuitry and
built-in RSInt options
R – Product with the built-in RSInt option
Part Number
SLA7075MR
SLA7075MPR
SLA7076MR
SLA7076MPR
SLA7077MR
SLA7077MPR
SLA7078MR
SLA7078MPR
Protection
RSInt
Protection Circuitry and RSInt
RSInt
Protection Circuitry and RSInt
RSInt
Protection Circuitry and RSInt
RSInt
Protection Circuitry and RSInt
Output Current, IOUT
(A)
1
Sequencer
1.5
Microstep
2
3
Blanking Time
(μs)
Clock Edge
1.7 Positive
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts 01615-0036
Copyright © 2005 Allegro MicroSystems, Inc.

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SLA7075M, SLA7076M,
SLA7077M, and SLA7078M
Motor Driver ICs
FUNCTIONAL BLOCK DIAGRAM AND PIN ASSIGNMENTS
1234
14 13
18 6 7 8 9 16 10 15
11
20 21 22 23
MIC
Pre-
Driver
Protect
Sequencer
&
Sleep Circuit
Reg.
Pre-
Driver
Protect
SenseA 5
RSInt
DAC
+
Comp
-
OSC
PWM
Control
Synchro
Control
DAC
PWM
Control
+
Comp
-
OSC
RSInt
19
SenseB
17 12
Sync Gnd
For R products, protection circuits not built-in. FLAG pin is not connected internally.
Pin No. Symbol
Functions
Pin No.
1
OutA
Output of phase A
2
13
14
3
OutA
Output of phase A¯
4
15
16
5 SenseA Phase A current sensing
17
6
Mo
Output from monitor of 2-phase excitation
status
18
7 M1
19
8 M2 Commutation and Sleep2 setting
20
9 M3
21
10
Clock
Step clock input
22
11
VBB
Main power supply (for motor)
12
GND
Ground
23
*Flag pin active on PR products only; not internally connected for R products.
Symbol
Ref / Sleep1
VDD
Reset
F/R
Sync
Flag*
SenseB
OutB
OutB
Functions
Input for control current and Sleep1 setting
Power supply to logic
Reset for internal logic
Forward / reverse switch input
Synchronous PWM control switch input
Output from protection circuits monitor
Phase B current sensing
Output of phase B¯
Output of phase B
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SLA7075M, SLA7076M,
SLA7077M, and SLA7078M
Motor Driver ICs
ELECTRICAL CHARACTERISTICS, valid at TA = 25°C, VBB = 24 V, VDD = 5 V, applicable to both PR and R products, unless
otherwise specified
Characteristics
Symbol
Test Conditions
Min. Typ. Max.
Main Power Supply Current
IBB Normal mode
IBBS Sleep1 and Sleep2 modes
– – 15
– – 100
Logic Power Current
IDD
––5
MOSFET Breakdown Voltage
VDSS VBB = 44 V, IDS = 1 mA
–––
Maximum Response Frequency fclk Clock Duty Cycle = 50%
250 –
Logic Supply Voltage
VIL
VIH
– – 0.25 × VDD
0.75 × VDD
Logic Supply Current
IIL
IIH
– ±1 –
– ±1 –
REF Input Voltage
VREF See pages 6 and 7
–––
VREFS
Output OFF, Sleep1 mode, IBBS in specification,
sequencer = enable
2.0
VDD
REF Input Current
SENSE Voltage
IREF
VSInt
VREF = 0.1 V to 0.5 V, Step reference current
ratio: 100%
VREF – 0.03
±10
VREF
VREF+ 0.03
Sleep-Enable Recovery Time
Switching Time
tSE VREF = 2.0 V 1.5 V
tcon Clock Output ON
tcoff Clock Output OFF
100 –
– 2.0
– 1.5
Units
mA
μA
mA
V
kHz
V
V
μA
μA
V
V
μA
V
μs
μs
μs
115 Northeast Cutoff, Box 15036
4 Worcester, Massachusetts 01615-0036

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SLA7075M, SLA7076M,
SLA7077M, and SLA7078M
Motor Driver ICs
STEPPING CHARACTERISTICS, applicable to both PR and R products; representative values from SLA7070M series shown
Valid at TA = 25°C, VBB = 24 V, VDD = 5 V, unless otherwise specified
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Mode F
– 100 – %
Mode E
– 98.1 – %
Mode D
– 95.7 – %
Mode C
– 92.4 – %
Mode B
– 88.2 – %
Mode A
– 83.1 – %
Mode 9
– 77.3 – %
Step Reference Current Ratio
Mode 8 VREF VSInt = 100 %, VREF = 0.1 to 0.5 V
Mode 7
– 70.7 – %
– 63.4 – %
Mode 6
– 55.5 – %
Mode 5
– 47.1 – %
Mode 4
– 38.2 – %
Mode 3
– 29 – %
Mode 2
– 19.5 – %
Mode 1
– 9.8 – %
Mo (Load) Output Voltage
Mo (Load) Output Current
PWM Minimum On-Time
PWM Off-Time
VMOL
VMOH
IMOL
IMOH
ton(min)
toff1
toff2
toff3
IMOL= 1.25 mA
IMOH= –1.25 mA
Mode 8 to Mode F
Mode 4 to Mode 7
Mode 1 to Mode 3
VDD– 1.25
–1.25
1.7
12
9
7
1.25 V
–V
1.25 mA
– mA
μs
μs
μs
μs
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