A3988: Quad DMOS Full Bridge PWM Motor Driver

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, undervoltage lockout (UVLO) and crossover current protection. 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 × 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.

The A3988SJPTR-T & A3988SEVTR-T variants are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of these devices is currently restricted to existing customer applications. The devices should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available.
Date of status change: June 1, 2016.

Top Features

  • 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A3988SEVTR-T 36-lead QFN/MLP -20°C to 85°C Yes View Data Not for new design Contact your
local sales rep
Check
Distributor Stock
A3988SJPTR-T 48-lead LQFP -20°C to 85°C Yes View Data Not for new design Contact your
local sales rep
Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

The A3988 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.

EV-QFN 36 pin with exposed pad

The JP is a 7 mm × 7 mm 48 pin LQFP.

JP QFP with exposed pad

Both packages are lead (Pb) free, with 100% matte tin leadframe plating.