A3977 Overview
The A3977 is a plete microstepping motor driver with built-in translator. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with output drive capability of 35 V and ±2.5 A. The A3977 includes a fixed off-time current regulator that has the ability to operate in slow-, fast-, or mixed-decay modes.
A3977 Key Features
- ±2.5 A, 35 V output rating
- Low RDS(on) outputs, 0.28 Ω source, 0.22 Ω sink typical
- Automatic current decay mode detection/selection
- 3.0 to 5.5 V logic supply voltage range
- Mixed, fast, and slow current decay modes
- Home output
- Synchronous rectification for low power dissipation
- Internal UVLO and thermal shutdown circuitry
- Crossover-current protection