A5988
Quad DMOS Full-Bridge PWM Motor Driver
FEATURES AND BENEFITS
DESCRIPTION
• 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
TheA5988isaquadDMOSfull-bridgedrivercapableofdriving
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,
alongwith2-bitnonlinearDACs(digital-to-analogconverters)
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 theAllegro™ 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)andcrossover-currentprotection.
Special power-up sequencing is not required.
PACKAGES
TheA5988issuppliedintwopackages,EVandJP,withexposed
power tabs for enhanced thermal performance. The EV is a
6 mm × 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.
Package EV, 36-pin QFN
0.90 mm nominal height
with exposed thermal pad
Package JP, 48-pin LQFP
with exposed thermal pad
Not to scale
0.1 µF
0.1 µF
50 V
VMOTOR 32 V
50 V
0.22 µF
50 V
100 µF
50 V
* JP package only
FAULTn*
PHASE1
I01
OUT1A
OUT1B
OUT2A
OUT2B
I11
PHASE2
I02
Bipolar Stepper Motors
I12
Microprocessor
OUT3A
OUT3B
OUT4A
OUT4B
PHASE3
I03
A5988
I13
PHASE4
I04
SENSE2
I14
RS2
RS1
RS3
RS4
VREF1
VREF2
VREF3
VREF4
SLEEPn
SENSE1
SENSE3
SENSE4
VREF
Figure 1: Typical Application Circuit
A5988-DS, Rev. 1