Datasheet A3964SLB, A3964SB Datasheet (Allegro)

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

DUAL FULL-BRIDGE PWM MOTOR DRIVER

3964

Data Sheet

29319.28*

A3964SLB

1

OUT

1B

1

OUT

LOAD

REF(IN)

RC

2

1

3

1A

4

5

6

7

9

8

1

9

1

10

1

V

BB

θ

1

PWM 1

SENSE

SUPPLY

GROUND

GROUND

V

PHASE

ENABLE

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, VBB. . . . . . . . . 33 V

Output Current, I

(continuous). . . . . . . . . . . . .

Logic Supply Voltage, V
Logic Input Voltage Range,

V

. . . . . . . . . . . -0.3 V to VCC + 0.3 V

IN

Sense Voltage, V
Reference Output Current,

I

REF(OUT)

Package Power Dissipation,

P

. . . . . . . . . . . . . . . . . . . . See Graph

D

Operating Temperature Range,

T

. . . . . . . . . . . . . . . . -20˚C to +85˚C

A

Junction Temperature, T
Storage Temperature Range,

T

. . . . . . . . . . . . . . . -55˚C to +150˚C

S

* Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any set
of conditions, do not exceed the specified current rating
or a junction temperature of 150˚C.

† Fault conditions that produce excessive junction
temperature will activate the device’s thermal shutdown
circuitry. These conditions can be tolerated but should
be avoided.

(10 µs) . . . . . . ±1.0 A*

OUT

CC

. . . . . . . . . . . . . . . 1.0 V

S

. . . . . . . . . . . . . . . . . . 1.0 mA

J

20

OUT

2B

2

19

SENSE

2

18

OUT

2A

LOGIC

17

V

CC

SUPPLY

16

GROUND

15

GROUND

V

14

REF(OUT)

13

RC

12

11

2

PHASE

ENABLE

Dwg. PP-047-1

2

2

PWM 2

θ

2

±800 mA*

. . . . . . . . . 7.0 V

. . . . . . . +150˚C†

Designed for pulse-width modulated (PWM) current control of
bipolar stepper motors, the A3964SB and A3964SLB are capable of
continuous output currents to ±800 mA and operating voltages to 30 V.
Internal fixed off-time PWM current-control circuitry can be used to
regulate the maximum load current to a desired value. An internal
precision voltage reference is provided to improve motor peak-current
control accuracy. The peak load current limit is set by the user’s
selection of an external resistor divider and current-sensing resistors.

The fixed off-time pulse duration is set by user-selected external
RC timing networks. The capacitor in the RC timing network also
determines a user-selectable blanking window that prevents false
triggering of the PWM current control circuitry during switching transi­tions. This eliminates the need for two external RC filter networks on
the current-sensing comparator inputs.

For each bridge the PHASE input controls load current polarity by
selecting the appropriate source and sink driver pair. For each bridge
the ENABLE input, when held high, disables the output drivers. Spe­cial power-up sequencing is not required. Internal circuit protection
includes thermal shutdown with hysteresis, transient-suppression
diodes, and crossover-current protection.

The A3964SB is supplied in a 24-pin plastic DIP with copper heat
sink tabs; A3964SLB is supplied in a 20-lead plastic SOIC with copper
heat sink tabs. The power tabs are at ground potential and need no
electrical isolation.

FEATURES

■ ±800 mA Continuous Output Current Rating

■ 30 V Output Voltage Rating

■ Internal PWM Current Control, Saturated Sink Drivers

■ Internally Generated, Precision 2.5 V Reference

■ Internal Transient-Suppression Diodes

■ Internal Thermal-Shutdown Circuitry

■ Crossover-Current Protection, UVLO Protection

Always order by complete part number:

Part Number Package

A3964SB 24-Pin DIP
A3964SLB 20-Lead Wide-Body SOIC

3964

1452

19

–

–
8109

3141820

7

121113

17

61516

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

A3964SB

5

R = 6.0°C/W

θJT

4

3

SUFFIX 'B', R = 40°C/W

2

1

SUFFIX 'LB', R = 60°C/W

0

25

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

50 75 100 125 150

TEMPERATURE IN °C

θJA

θJA

Dwg. GP-049-4

FUNCTIONAL BLOCK DIAGRAM

CONNECT.

OUT

SENSE

OUT

LOAD

SUPPLY

GROUND

GROUND

V

REF(IN)

PHASE

ENABLE

CONNECT.

(A3964SLB pinning shown)

RC

NO

NO

1

NC

2

1B

1

3

1

4

1A

5

6

7

8

9

9

1

10

θ

1

1

11

1

12

NC

V

BB

PWM 1

2

V

PWM 2

NC

NC

NO

24

CONNECT.

23

OUT

2B

22

SENSE

2

21

OUT

2A

LOGIC

20

CC

SUPPLY

19

GROUND

18

GROUND

17

V

REF(OUT)

16

RC

2

15

PHASE

θ

2

14

13

2

ENABLE

NO
CONNECT.

Dwg. PP-005-2

2

PHASE

ENABLE

1

1

R

T

SOURCE
DISABLE

ONE SHOT

1

RC

C

T

LOGIC

V

CC

PWM 1

SUPPLY

+

SENSE

OUT

1

1A

1

2.5 V

REFERENCE

OUT

REF

1B

OUT

R

A

IN

REF

R

S

V

V

REF(IN)

LOAD

BB

R

SUPPLY

B

2A

OUT

2B

OUT

UVLO
& TSD

PHASE

2

2

PWM 2

ENABLE

2

SOURCE
DISABLE

+

2

ONE SHOT

2

RC

R

SENSE

S

C

T

R

T

Dwg. FP-033-1

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Copyright © 1997 Allegro MicroSystems, Inc.

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

TRUTH TABLE

ENABLE PHASE OUT

OUT

A

B

H X Off Off

L HHL
LLLH

X = Irrelevant

ELECTRICAL CHARACTERISTICS at T
V

= 0 V, 30 kΩ & 1000 pF RC to Ground (unless noted otherwise)

S

Characteristic Symbol Test Conditions Min. Typ. Max. Units

= +25°C, V

A

= 30 V, VCC = 4.75 V to 5.25 V,

BB

Limits

Output Drivers

Load Supply Voltage Range V
Output Sustaining Voltage V

CE(sus)

Output Leakage Current I

Output Saturation Voltage V

CE(SAT)

Clamp Diode Forward Voltage V
(Sink or Source)

Motor Supply Current I
(No Load)

BB(ON)

I

BB(OFF)

BB

CEX

F

Operating, I
I

= ±800 mA, L = 3 mH, VBB = 33 V 33 — — V

OUT

V

= VBB = 33 V — <1.0 50 µA

OUT

V

= 0 V, VBB = 33 V — <1.0 -50 µA

OUT

Source Driver, I
Source Driver, I
Source Driver, I
Sink Driver, I
Sink Driver, I
Sink Driver, I

= ±800 mA, L = 3 mH 5.0 — 30 V

OUT

= -500 mA — 1.0 1.2 V

OUT

= -750 mA — 1.1 1.5 V

OUT

= -800 mA — — 1.7 V

OUT

= +500 mA — 0.3 0.6 V

OUT

= +750 mA — 0.5 1.2 V

OUT

= +800 mA — — 1.5 V

OUT

IF = 500 mA — 1.1 1.4 V
I

= 750 mA — 1.3 1.6 V

F

IF = 800 mA — — 1.7 V
V
V

= 0.8 V — 2.0 4.0 mA

ENABLE

= 2.4 V — 0 500 µA

ENABLE

NOTES: 1. Typical Data is for design information only.

2. Negative current is defined as coming out of (sourcing) the specified device terminal.

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

ELECTRICAL CHARACTERISTICS at T

= +25°C, V

A

= 30 V, VCC = 4.75 V to 5.25 V, V

BB

SENSE

V, 30 kΩ & 1000 pF RC to Ground (unless noted otherwise) (cont.)

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Control Logic

Logic Supply Voltage Range V
Logic Input Voltage V

Logic Input Current I

Reference Output Voltage V
Reference Output Current I
Ref. Input Offset Current I
Comparator Input Offset Volt. V
Comparator Input Volt. Range V
PWM RC Fixed Off-time t
PWM Propagation Delay Time t
PWM Minimum On Time t
Propagation Delay Times t

Thermal Shutdown Temp. T
Thermal Shutdown Hysteresis ∆T

CC

IN(1)

V

IN(0)

IN(1)

I

IN(0)

REF(OUT)

REF(OUT)

OS

IO

REF

OFF RC

PWM

ON(min)

pd

J

J

UVLO Disable Threshold Decreasing V
UVLO Hysteresis UVLO Enable Volt. - UVLO Disable Volt. 0.075 0.125 0.175 V
UVLO Enable Threshold Increasing V
Logic Supply Current I

Logic Supply Current ∆I

CC(ON)

I

CC(OFF)

CC(ON)

Temperature Coefficient

Operating 4.75 — 5.25 V

2.4 — — V
— — 0.8 V

V

= 2.4 V — <1.0 20 µA

IN

V

= 0.8 V — <-2.0 -200 µA

IN

V

= 5.0 V, I

CC

3 kΩ ≤ RD = RA + R
V
V

= 1 V -2.5 0 1.0 µA

REF(IN)

= 0 V -6.0 0 6.0 mV

REF(IN)

= 90 to 900 µA 2.45 2.50 2.55 V

REF(OUT)

≤ 15 kΩ 150 — 900 µA

B

Operating -0.3 — 1.0 V
CT = 1000 pF, RT = 30 kΩ 27 30 33 µs
Comparator Trip to Source OFF — 1.2 2.0 µs
CT = 1000 pF, RT ≥ 15 kΩ, VCC = 5 V — 2.5 3.6 µs
I

= ±800 mA, 50% to 90%:

OUT

ENABLE ON to Source ON — 3.2 — µs
ENABLE OFF to Source OFF — 1.2 — µs
ENABLE ON to Sink ON — 3.2 — µs
ENABLE OFF to Sink OFF — 0.7 — µs
PHASE Change to Sink ON — 3.2 — µs
PHASE Change to Source ON — 3.2 — µs
PHASE Change to Sink OFF — 0.7 — µs
PHASE Change to Source OFF — 1.2 — µs

— 165 — °C
—15—°C

CC

CC

V

ENABLE 1

V

ENABLE 1

V

ENABLE 1 = VENABLE 2

= V
= V

ENABLE 2

ENABLE 2

= 0.8 V — 60 85 mA
= 2.4 V — 13 17 mA

= 0.8 V — 0.18 — mA/°C

4.20 4.40 4.65 V

4.375 4.525 4.725 V

= 0

NOTES: 1. Typical Data is for design information only.

2. Negative current is defined as coming out of (sourcing) the specified device terminal.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

FUNCTIONAL DESCRIPTION

Internal PWM Current Control. The A3964SB and
A3964SLB contain a fixed off-time pulse-width modulated
(PWM) current-control circuit that can be used to limit the
load current to a desired value. The peak value of the
current limiting (I

) is set by the selection of an external

TRIP

current-sensing resistor (RS) and reference input voltage
(V

). The internal circuitry compares the voltage

REF(IN)

across the external sense resistor to the voltage on the
reference input terminal (V

) resulting in a

REF(IN)

transconductance function approximated by:

V

I

TRIP

≈

REF(IN)

R

S

The reference input voltage is typically set with a

resistor divider from V

REF(OUT)

. To ensure proper operation
of the voltage reference, the resistor divider should have
an impedance of 3 kΩ to 15 kΩ (RD = RA+RB). Within this
range, a low impedance will minimize the effect of the REF
IN input offset current.

The current-control circuitry limits the load current as

follows: when the load current reaches I

, the compara-

TRIP

tor resets a latch that turns off the selected source driver.
The load inductance causes the current to recirculate
through the sink driver and flyback diode.

For each bridge, the user selects an external resistor
(RT) and capacitor (CT) to determine the time period
(t

= RTCT) during which the source driver remains

OFF

disabled (see “RC Fixed Off-time” below). The range of
recommended values for CT and RT are 1000 pF to 1500
pF and 15 kΩ to 100 kΩ respectively. For optimal load
current regulation, CT is normally set to 1000 pF (see
“Load Current Regulation” below). At the end of the RC
interval, the source driver is enabled allowing the load
current to increase again. The PWM cycle repeats,
maintaining the peak load current at the desired value.

RC Blanking. In addition to determining the fixed off-time
of the PWM control circuit, the CT component sets the
comparator blanking time. This function blanks the output
of the comparator when the outputs are switched by the
internal current-control circuitry (or by the PHASE or
ENABLE inputs). The comparator output is blanked to

prevent false over-current detections due to reverse­recovery currents of the clamp diodes, and/or switching
transients related to distributed capacitance in the load.

During internal PWM operation, at the end of the t

OFF

time, the comparator’s output is blanked and CT begins to
be charged from approximately 1.1 volts by an internal
current source of approximately 1 mA. The comparator
output remains blanked until the voltage on CT reaches
approximately 3 volts.

When a transition of the PHASE input occurs, C

T

is discharged to near ground during the crossover delay
time (the crossover delay time is present to prevent
simultaneous conduction of the source and sink drivers).
After the crossover delay, CT is charged by an internal
current source of approximately 1 mA. The comparator
output remains blanked until the voltage on CT reaches
approximately 3 volts.

When the device is disabled, via the ENABLE input,
CT is discharged to near ground. When the device is
re-enabled, CT is charged by an internal current source of
approximately 1 mA. The comparator output remains
blanked until the voltage on CT reaches approximately
3 volts.

The minimum recommended value for CT is
1000 pF. This value ensures that the blanking time is

sufficient to avoid false trips of the comparator under
normal operating conditions. For optimal regulation of the
load current, the above value for CT is recommended and
the value of RT can be sized to determine t

. For more

OFF

information regarding load current regulation, see below.
Load Current Regulation. Because the device operates

in a slow current-decay mode (2-quadrant PWM mode),
there is a limit to the lowest level that the PWM current
control circuitry can regulate load current. The limitation is
due to the minimum PWM duty cycle, which is a function of
the user-selected value of t
pulse t

max that occurs each time the PWM latch is

ON(min)

and the minimum on-time

OFF

reset. If the motor is not rotating, as in the case of a
stepper motor in hold/detent mode, a brush dc motor when
stalled or at startup, the worst case value of current
regulation can be approximated by:

I

AVG

≈

[(V

– V

BB

SAT(SOURCE+SINK)

1.05 (t

) • t

ON(min)

max] – (1.05 (V

ON(min)

max + t

OFF

) • R

SAT(SINK)

LOAD

+ VF) • t

OFF

)

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

where t
load, VBB is the motor supply voltage and t

= RTCT, R

OFF

is the series resistance of the

LOAD

ON(min)

max is
specified in the electrical characteristics table. When the
motor is rotating, the back EMF generated will influence
the above relationship. For brush dc motor applications,
the current regulation is improved. For stepper motor
applications when the motor is rotating, the effect is
dependent on the polarity and magnitude of the motor’s
back EMF.

The following procedure can be used to evaluate the
worst case internal PWM load current regulation in the
system:

Set V

to 0 volts. With the load connected and the

REF(IN)

PWM current control operating in slow decay mode, use
an oscilloscope to measure the time the output is low
(sink ON) for the output that is chopping. This is the
typical minimum on time (t

typ) for the device. The

ON(min)

CT then should be increased until the measured value of
t

ON(min)

is equal to t

max as specified in the electri-

ON(min)

cal characteristics table. When the new value of CT has
been set, the value of RT should be decreased so the
value for t

= RTCT (with the artificially increased value

OFF

of CT) is equal to the nominal design value. The worst­case load-current regulation then can be measured in
the system under operating conditions.

PWM of the Phase and Enable Inputs. The PHASE and
ENABLE inputs can be pulse width modulated to regulate
load current. Typical propagation delays from the PHASE
and ENABLE inputs to transitions of the power outputs are
specified in the electrical characteristics table. If the
internal PWM current control is used, the comparator
blanking function is active during phase and enable
transitions. This eliminates false tripping of the over­current comparator caused by switching transients
(see “RC Blanking” above).

Enable PWM. Toggling the ENABLE input turns ON and
OFF the selected source and sink drivers. The corre­sponding pair of flyback and ground clamp diodes conduct
after the drivers are disabled, resulting in fast current
decay. When the device is enabled the internal current
control circuitry will be active and can be used to limit the
load current in a slow current-decay mode.

Phase PWM. Toggling the PHASE terminal selects which
sink/source pair is enabled, producing a load current that
varies with the duty cycle and remains continuous at all
times. This can have added benefits in bidirectional brush

dc servo motor applications as the transfer function
between the duty cycle on the PHASE input and the
average voltage applied to the motor is more linear than in
the case of ENABLE PWM control (which produces a
discontinuous current at low current levels).

Miscellaneous Information. An internally generated
dead time prevents crossover currents that can occur
when switching phase.

Thermal protection circuitry turns OFF all drivers
should the junction temperature reach +165°C (typical).
This is intended only to protect the device from failures
due to excessive junction temperatures and should not
imply that output short circuits are permitted. The hyster­esis of the thermal shutdown circuit is approximately 15°C.

APPLICATION NOTES

Current Sensing. The actual peak load current (I
be above the calculated value of I

due to delays in the

TRIP

turn off of the drivers. The amount of overshoot can be
approximated by:

(VBB – [(I

TRIP

• R

LOAD

) + V

BEMF

]) • t

IOS ≈

L

LOAD

where VBB is the motor supply voltage, V
EMF voltage of the load, R

LOAD

and L

LOAD

is the back-

BEMF

are the resis­tance and inductance of the load respectively, and t
specified in the electrical characteristics table.

To minimize current sensing inaccuracies caused by
ground trace IR drops, each current-sensing resistor
should have a separate return to the ground terminal of the
device. For low-value sense resistors, the IR drops in the
PCB can be significant and should be taken into account.
The use of sockets should be avoided as their contact
resistance can cause variations in the effective value of
RS.

Generally, larger values of RS reduce the aforemen­tioned effects but can result in excessive heating and
power loss in the sense resistor. The selected value of R
should not cause the absolute maximum voltage rating of

1.0 V, for the SENSE terminal, to be exceeded. The
recommended value of RS is in the range of:

0.5

RS ≈± 50%

I

max

TRIP

PEAK

PWM

) will

PWM

is

S

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

If desired, the reference input voltage can be filtered
by placing a capacitor from REFIN to ground. The ground
return for this capacitor as well as RB should be indepen­dent from the high-current power-ground trace to avoid
changes in REFIN due to IR drops.

Thermal Considerations. For reliable operation, it is
recommended that the maximum junction temperature be
kept below 110°C to 125°C. The junction temperature can
be measured best by attaching a thermocouple to the
power tab/batwing of the device and measuring the tab
temperature, T
approximated by using the formula:

. The junction temperature can then be

TAB

TJ ≈ T

TAB

+ (2 I

LOAD VF RθJT

)

where VF can be chosen from the electrical specification
table for the given level of I

. The value for R

LOAD

θJT

is

approximately 6°C/W for both package styles.

The power dissipation of the batwing packages can be
improved by 20 to 30% by adding a section of printed
circuit board copper (typically 6 to 18 square centimeters)
connected to the batwing terminals of the device.

The thermal performance in applications that run at
high load currents and/or high duty cycles can be im­proved by adding external diodes from each output to
ground in parallel with the internal diodes. Fast-recovery
(≤200 ns) diodes should be used to minimize switching
losses.

The load supply terminal, VBB, should be decoupled
with an electrolytic capacitor (≥47 µF is recommended)
placed as close to the device as is physically practical.
To minimize the effect of system ground IR drops on the
logic and reference input signals the system ground should
have a low-resistance return to the load supply voltage.

See also “Current Sensing” and “Thermal Consider­ations” above.

Fixed Off-Time Selection. With increasing values of t
switching losses will decrease, low-level load current
regulation will improve, EMI will be reduced, the PWM
frequency will decrease, and ripple current will increase.
The value of t

can be chosen for optimization of these

OFF

parameters. For applications where audible noise is a
concern, typical values of t

are chosen to be in the

OFF

range of 15 to 35 µs.

OFF

,

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

24

0.280

0.240

NOTE 1

A3964SB

Dimensions in Inches

(controlling dimensions)

13

0.014

0.008

0.300

BSC

0.430

MAX

0.210

MAX

7.11

6.10

0.015

MIN

16

0.070

7

0.045

0.022

0.014

24

1

NOTE 1

67

1.77

1.15

0.100

1.280

BSC

1.230

Dimensions in Millimeters

(for reference only)

2.54

32.51

31.24

BSC

13

12

12

0.005

MIN

0.150

0.115

0.13

MIN

0.355

0.204

Dwg. MA-001-25A in

10.92

MAX

7.62

BSC

5.33

MAX

0.39

MIN

0.558

0.356

NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.

2. Lead spacing tolerance is non-cumulative.

3. Exact body and lead configuration at vendor’s option within limits shown.

4. Lead thickness is measured at seating plane or below.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

3.81

2.93

Dwg. MA-001-25A mm

3964

D

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

20 11

A3964SLB

Dimensions in Inches

(for reference only)

0.0125

0.0091

0.2992

0.2914

0.020

0.013

0.0926

0.1043

7.60

7.40

1 2

0.0040

20

MIN.

3

0.050

0.5118

0.4961

BSC

Dimensions in Millimeters

(controlling dimensions)

11

NOTE 1
NOTE 3

0.419

0.394

10.65

10.00

0° TO 8°

wg. MA-008-21A in

0.050

0.016

0.32

0.23

1.27

0.40

0.51

0.33

2.65

2.35

NOTES: 1. Webbed lead frame. Leads 5, 6, 15, and 16 are internally one piece.

2. Lead spacing tolerance is non-cumulative.

3. Exact body and lead configuration at vendor’s option within limits shown.

1

0.10

2

MIN.

3

13.00

12.60

1.27

BSC

NOTE 1
NOTE 3

0° TO 8°

Dwg. MA-008-21A mm

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

MOTOR DRIVERS SELECTION GUIDE

Function Output Ratings * Part Number †

INTEGRATED CIRCUITS FOR BRUSHLESS DC MOTORS

3-Phase Controller/Drivers ±2.0 A 45 V 2936 and 2936-120

Hall-Effect Latched Sensors 10 mA 24 V 3175 and 3177
2-Phase Hall-Effect Sensor/Controller 20 mA 25 V 3235
Hall-Effect Complementary-Output Sensor 20 mA 25 V 3275
2-Phase Hall-Effect Sensor/Driver 900 mA 14 V 3625
2-Phase Hall-Effect Sensor/Driver 400 mA 26 V 3626
Hall-Effect Complementary-Output Sensor/Driver 300 mA 60 V 5275

3-Phase Back-EMF Controller/Driver ±900 mA 14 V 8902–A
3-Phase Controller/DMOS Driver ±4.0 A 14 V 8925
3-Phase Back-EMF Controller/Driver ±1.0 A 7 V 8984

INTEGRATED BRIDGE DRIVERS FOR DC AND BIPOLAR STEPPER MOTORS

PWM Current-Controlled Dual Full Bridge ±750 mA 45 V 2916
PWM Current-Controlled Dual Full Bridges ±1.5 A 45 V 2917 and 2918
PWM Current-Controlled Dual Full Bridge ±750 mA 45 V 2919
Dual Full-Bridge Driver ±2.0 A 50 V 2998
PWM Current-Controlled Full Bridge ±2.0 A 50 V 3952
PWM Current-Controlled Full Bridge ±1.3 A 50 V 3953
PWM Current-Controlled Microstepping Full Bridges ±1.5 A 50 V 3955 and 3957
PWM Current-Controlled Dual Full Bridge ±800 mA 33 V 3964
PWM Current-Controlled Dual Full Bridge ±650 mA 30 V 3966 and 3968
PWM Current-Controlled Dual Full Bridge ±750 mA 45 V 6219

OTHER INTEGRATED CIRCUIT & PMCM MOTOR DRIVERS

Unipolar Stepper-Motor Quad Driver 1.8 A 50 V 2544
Unipolar Stepper-Motor Translator/Driver 1.25 A 50 V 5804
Unipolar Stepper-Motor Quad Drivers 1 A 46 V 7024 and 7029
Unipolar Microstepper-Motor Quad Driver 1.2 A 46 V 7042

Voice-Coil Motor Driver ±500 mA 6 V 8932–A
Voice-Coil Motor Driver ±800 mA 16 V 8958

Voice-Coil (and Spindle) Motor Driver ±350 mA 7 V 8984

* Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits

or over-current protection voltage limits. Negative current is defined as coming out of (sourcing) the output.
† Complete part number includes additional characters to indicate operating temperature range and package style.

Allegro MicroSystems, Inc. reserves the right to make, from time to time,
such departures from the detail specifications as may be required to permit
improvements in the design of its products. Components made under
military approvals will be in accordance with the approval requirements.

The information included herein is believed to be accurate and reliable.
However, Allegro MicroSystems, Inc. assumes no responsibility for its use;
nor for any infringements of patents or other rights of third parties which may
result from its use.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]