Designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors, the A3972 is capable of continuous output currents to ±1.5 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes.
The A3972 is a dual DMOS full‑bridge motor driver designed for PWM current control of bipolar microstepping stepper motors. It provides up to +1.5 A continuous output current at 50 V and supports 3.3 V or 5 V control signals.
Key features include a 4 MHz internal oscillator, programmable mixed/fast/slow current‑decay modes, serial‑interface control, synchronous rectification, internal UVLO, thermal shutdown, and crossover‑current protection. The device is supplied in a 24‑pin DIP package with fused leads and is lead‑free with matte tin plating.
| Continuous Output Rating | +1.5 A, 50 V |
|---|---|
| Load Supply Voltage (Vee) | 50 V |
| Logic Supply Voltage (Vop) | 7.0 V |
| Package Type | 24‑pin DIP with 4 fused leads |
| Internal Oscillator Frequency | 4 MHz |
The driver can deliver up to +1.5 A continuous output current at 50 V.
It is controlled via a 3‑wire serial interface (clock, data, strobe).
The device includes internal UVLO, thermal shutdown circuitry, and crossover‑current protection.
The A3972 is supplied in a 24‑pin DIP package with four fused leads (suffix B).