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A3988 Datasheet(HTML) 1 Page - Allegro MicroSystems

Part No. A3988
Description  Quad DMOS Full Bridge PWM Motor Driver
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A3988 Datasheet(HTML) 1 Page - Allegro MicroSystems

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Description
The A3988 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 Allegro®
patented 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,
undervoltagelockout(UVLO)andcrossovercurrentprotection.
Special power up sequencing is not required.
The A3988 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. 5
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
Quad DMOS Full Bridge PWM Motor Driver
Packages
A3988
Approximate scale
Figure 1. Typical application circuit
PHASE1
I01
I11
SENSE1
OUT2A
OUT1A
SENSE2
OUT2B
OUT1B
VDD
SENSE4
OUT4B
OUT4A
SENSE3
OUT3B
OUT3A
VREF2
PHASE2
VREF1
VREF4
VREF3
VREF
VDD 3.3 V
VMOTOR 32 V
I02
I12
PHASE3
I03
I13
PHASE4
I04
I14
0.1 μF
50 V
100 μF
50 V
0.22 μF
50 V
0.1 μF
50 V
A3988
Bipolar Stepper Motors
Microprocessor
RS2
RS1
RS3
RS4
Package EV, 36 pin QFN
0.90 mm nominal height
with exposed thermal pad
Package JP, 48 pin LQFP
with exposed thermal pad


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