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Product Detailed Parameters
- Description：IC MTR DRV BIPOLR 4.5-5.5V 24DIP
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tube
- Motor Type - Stepper：Bipolar
- Motor Type - AC, DC：-
- Function：Driver - Fully Integrated, Control and Power Stage
- Output Configuration：Half Bridge (4)
- Interface：Serial
- Technology：DMOS
- Step Resolution：1 ~ 1/64
- Applications：General Purpose
- Current - Output：1A
- Voltage - Supply：4.5V ~ 5.5V
- Voltage - Load：15V ~ 35V
- Operating Temperature：-20°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：24-PowerDIP (0.300", 7.62mm)
- Supplier Device Package：24-DIP
- Grade：-
- Qualification：-
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Overview
The A3973SB is a dual DMOS full-bridge microstepping PWM motor driver designed for bipolar stepper motors. It provides continuous output currents up to ±1 A and supports operating voltages up to 35 V. The device features internal fixed off-time PWM current control, programmable mixed, fast, and slow decay modes, and a 4 MHz internal oscillator. It includes synchronous rectification, crossover-current protection, and thermal shutdown.
Feature Summary
- Integrated DMOS full-bridge architecture with low RDS(on) output drivers
- Programmable current decay modes via serial interface
- Synchronous rectification for reduced power dissipation
- Built-in protection against thermal overload and cross-conduction
Applications
- Bipolar microstepping stepper motor control
- Industrial automation systems
- Precision positioning mechanisms
Procurement Notes
Verify the specific suffix 'SB' against the manufacturer's official datasheet to confirm pinout compatibility and package type. Ensure the application voltage does not exceed the 35 V rating. Confirm that the required logic levels are compatible with the specified input thresholds before finalizing procurement.
Selection Notes
Select this component when bipolar stepper motor control with integrated power stages is required. It is suitable for applications needing precise current regulation and multiple decay mode options. Consider the 35 V voltage limit and ±1 A current capability relative to the load requirements.
Part Context
The A3973 series represents Allegro's DMOS technology for microstepping drivers, succeeding earlier bipolar technologies. It offers higher power density and improved switching performance compared to legacy devices. The SB variant typically denotes a specific package configuration within the broader A3973 family.
Replacement Considerations
The A3973SB may serve as a direct replacement for older bipolar-based stepper drivers like the A3972, offering improved efficiency and integration. Verify pin-to-pin compatibility and thermal characteristics when substituting.
