A4987 Description
The A4987 is a dual DMOS full-bridge stepper motor driver with parallel input munication and overcurrent protection. Each full-bridge output is rated up to 35 V and ±1 A. The A4987 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.
A4987 Key Features
- Low RDS(ON) outputs
- Internal mixed current decay mode
- Synchronous rectification for low power dissipation
- Internal UVLO
- Crossover-current protection
- 3.3 and 5 V patible logic supply
- Thin profile QFN and TSSOP packages
- Thermal shutdown circuitry
- Short-to-ground protection
- Shorted load protection