The A3965 is a unique device within Allegro’s portfolio, typically fitting niche low-voltage, battery-driven stepper motor applications.
The Allegro MicroSystems A3965 is a DMOS Dual Full-Bridge PWM Motor Driver designed for pulse width modulated current control of low voltage stepper motors. It is capable of output currents up to +500 mA and operating voltages up to 20 V, making it suitable for low power or battery-operated applications. The device features a Sleep mode for minimum power consumption and includes internal circuit protection such as thermal shutdown with hysteresis, undervoltage monitoring, and crossover current protection. It is supplied in a 24-lead plastic SOIC package with a copper batwing tab.
This document is a preliminary datasheet dated December 4, 2002. It explicitly states that the A3965 is 'NOT FOR NEW DESIGN' as of November 1, 2004, indicating that sale is restricted to existing customer applications and obsolescence is probable. The datasheet provides absolute maximum ratings, electrical characteristics, functional descriptions, and a terminal list for the device.
| Output Current | +500 mA |
|---|---|
| Logic Supply Voltage | 2.85 to 5.5 V |
| Operating Temperature Range | -20°C to +85°C |
| Thermal Shutdown Temp. | 165°C |
No, the device is not for new design applications as it is restricted to existing customer applications due to probable obsolescence.
The closest device functionally is the A3966, provided supply current and low logic voltage are not issues.
The maximum output current is +500 mA.