The A5988 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.
The A5988 is supplied in two packages, EV and JP, with exposed
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.
