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| A5988 Datasheet, PDF (1/14 Pages) Allegro MicroSystems – Quad DMOS Full-Bridge PWM Motor Driver | |||
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A5988
Quad DMOS Full-Bridge PWM Motor Driver
FEATURES AND BENEFITS
⢠40 V output rating
⢠4 full bridges
⢠Dual stepper motor driver
⢠High-current outputs
⢠3.3 and 5 V compatible logic
⢠Synchronous rectification
⢠Internal undervoltage lockout (UVLO)
⢠Thermal shutdown circuitry
⢠Crossover-current protection
⢠Overcurrent protection
⢠Low-power sleep mode
⢠Low-profile QFN package
PACKAGES
Package EV, 36-pin QFN
0.90 mm nominal height
with exposed thermal pad
DESCRIPTION
TheA5988 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 1.6 A and 40 V. The A5988 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,
undervoltage lockout (UVLO) and crossover-current protection.
Special power-up sequencing is not required.
TheA5988 is supplied in two packages, EV and JP, with exposed
power tabs for enhanced thermal performance. The EV is a
6â¯mmâ¯Ãâ¯6â¯mm, 36-pin QFN package with a nominal overall
package height of 0.90 mm. The JP is a 7â¯mm à 7â¯mm 48-pin
LQFP. Both packages are lead (Pb) free, with 100% matte-tin
leadframe plating.
Package JP, 48-pin LQFP
with exposed thermal pad
Not to scale
A5988-DS, Rev. 1
* JP package only
0.1 µF
50 V
0.1 µF
50 V
100 µF
50 V
VMOTOR 32 V
0.22 µF
50 V
Microprocessor
VREF
FAULTn*
PHASE1
I01
I11
PHASE2
I02
I12
PHASE3
I03
I13
PHASE4
I04
I14
VREF1
VREF2
VREF3
VREF4
SLEEPn
A5988
OUT1A
OUT1B
OUT2A
OUT2B
OUT3A
OUT3B
OUT4A
OUT4B
SENSE2
SENSE1
SENSE3
SENSE4
Bipolar Stepper Motors
RS2
RS1
RS3
RS4
Figure 1: Typical Application Circuit
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