Motor Driver. A3988 Datasheet

A3988 Driver. Datasheet pdf. Equivalent

Part A3988
Description Quad DMOS Full Bridge PWM Motor Driver
Feature www.DataSheet4U.com A3988 Quad DMOS Full Bridge PWM Motor Driver Features and Benefits ▪ ▪ ▪ ▪ ▪ ▪ .
Manufacture Allegro MicroSystems
Datasheet
Download A3988 Datasheet



A3988
A3988
Quad DMOS Full Bridge PWM Motor Driver
FEATURES AND BENEFITS
• 36 V output rating
• 4 full bridges
• Dual stepper motor driver
• High current outputs
• 3.3 and 5 V compatible logic supply
• Synchronous rectification
• Internal undervoltage lockout (UVLO)
• Thermal shutdown circuitry
• Crossover-current protection
• Low profile QFN package
Packages
Package EV, 36 pin QFN
0.90 mm nominal height
with exposed thermal pad
Approximate scale
Package JP, 48 pin LQFP
with exposed thermal pad
DESCRIPTION
TheA3988 is a quad DMOS full-bridge driver capable of driving
up to two stepper motors or four DC motors. Each full-bridge
output is rated up to 1.2 A and 36 V. The A3988 includes fixed
off-time pulse width modulation (PWM) current regulators,
along with 2- bit nonlinear DACs (digital-to-analog converters)
that allow stepper motors to be controlled in full, half, and
quarter steps, and DC motors in forward, reverse, and coast
modes. The PWM current regulator uses the Allegropatented
mixed decay mode for reduced audible motor noise, increased
step accuracy, and reduced power dissipation.
Internal synchronous rectification control circuitry is provided
to improve power dissipation during PWM operation.
Protection features include thermal shutdown with hysteresis,
undervoltage lockout (UVLO) and crossover current protection.
Special power up sequencing is not required.
TheA3988 is supplied in two packages, EV and JP, with exposed
power tabs for enhanced thermal performance. The EV is a
6 mm x 6 mm, 36 pin QFN package with a nominal overall
package height of 0.90 mm. The JP is a 7 mm × 7 mm 48 pin
LQFP. Both packages are lead (Pb) free, with 100% matte tin
leadframe plating.
A3988DS, Rev. 10
Microprocessor
VREF
VDD 3.3 V
0.1 µF
50 V
0.1 µF
50 V
100 µF
50 V
VMOTOR 32 V
0.22 µF
50 V
PHASE1
I01
I11
PHASE2
I02
I12
PHASE3
I03
I13
PHASE4
I04
I14
VREF1
VREF2
VREF3
VREF4
VDD
A3988
OUT1A
OUT1B
OUT2A
OUT2B
OUT3A
OUT3B
OUT4A
OUT4B
SENSE2
SENSE1
SENSE3
SENSE4
Bipolar Stepper Motors
RS2
RS1
RS3
RS4
Typical Application Circuit



A3988
A3988
Quad DMOS Full Bridge PWM Motor Driver
Selection Guide
Part Number
A3988SEV-T
A3988SEVTR-T
A3988SJPTR-T
Package
36 pin QFN with exposed thermal pad
36 pin QFN with exposed thermal pad
48 pin LQFP with exposed thermal pad
Packing
61 pieces per tube
1500 pieces per reel
1500 pieces per reel
SPECIFICATIONS
Absolute Maximum Ratings
Characteristic
Symbol
Load Supply Voltage
VBB
Logic Supply Voltage
Output Current
VDD
IOUT
Logic Input Voltage Range
SENSEx Pin Voltage
VIN
VSENSEx
VREFx Pin Voltage
Operating Temperature Range
Junction Temperature
Storage Temperature Range
VREFx
TA
TJ(max)
Tstg
Notes
Pulsed tw < 1 µs
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.
Pulsed tw < 1 µs
Pulsed tw < 1 µs
Range S
Thermal Characteristics (may require derating at maximum conditions)
Characteristic
Symbol
Test Conditions
Package Thermal Resistance
RθJA
EV package, 4 layer PCB based on JEDEC standard
JP package, 4 layer PCB based on JEDEC standard
Rating
-0.5 to 36
38
–0.4 to 7
1.2
Units
V
V
V
A
2.8
–0.3 to 7
0.5
2.5
2.5
–20 to 85
150
–40 to 125
A
V
V
V
V
ºC
ºC
ºC
Min. Units
27 ºC/W
23 ºC/W
Power Dissipation versus Ambient Temperature
5500
5000
4500
4000
JP Package
4-layer PCB
(RθJA = 23 ºC/W)
3500
3000
2500
2000
1500
EV Package
4-layer PCB
(RθJA = 27 ºC/W)
1000
500
0
25 50 75 100 125 150 175
Temperature (°C)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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