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A3988: Quad DMOS Full Bridge PWM Motor Driver (PDF)
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Power Motor Drivers - Full-Bridge
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A3988: Allegro Announces New Quad DMOS Full-Bridge PWM Motor Driver
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A3988
Quad DMOS Full Bridge PWM Motor Driver
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
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 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.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3988SEVTR-T | 36-lead QFN/MLP | Yes | view data | -20 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A3988SJP-T | 48-lead LQFP | Yes | view data | -20 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.