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Product Detailed Parameters
- Description：IC MTR DRVR BIPOLAR 3-5.5V 16DIP
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tube
- Motor Type - Stepper：Bipolar
- Motor Type - AC, DC：Brushed DC
- Function：Driver - Fully Integrated, Control and Power Stage
- Output Configuration：Half Bridge (2)
- Interface：Parallel
- Technology：Power MOSFET
- Step Resolution：-
- Applications：General Purpose
- Current - Output：1.5A
- Voltage - Supply：3V ~ 5.5V
- Voltage - Load：5V ~ 50V
- Operating Temperature：-20°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：16-PowerDIP (0.300", 7.62mm)
- Supplier Device Package：16-DIP
- Grade：-
- Qualification：-
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Overview
The A4973SB-T is a full-bridge PWM motor driver designed for bidirectional current control of inductive loads. It supports continuous output currents up to ±1.5 A and operating voltages up to 50 V. The device features internal fixed off-time PWM current-control circuitry, allowing peak load current regulation via an external sensing resistor and reference voltage. Logic supply voltage ranges from 3 V to 5.5 V. Internal protections include thermal shutdown with hysteresis, transient-suppression diodes, crossover current protection, and UVLO.
Feature Summary
- Internal fixed off-time PWM current control for precise load regulation
- Integrated fast and slow current-decay modes
- Built-in thermal shutdown with hysteresis and transient-suppression diodes
- Crossover current and under-voltage lockout (UVLO) protection
Applications
- Brushed DC motor control
- Solenoid driving
- Valve control systems
- General inductive load switching
Procurement Notes
Verify the specific suffix 'SB' indicates the DIP-16 package variant when ordering. Confirm logic supply voltage requirements align with the 3 V to 5.5 V range. Ensure external RC timing networks are selected correctly for the desired fixed off-time pulse duration. Check that the application environment stays within the specified operating temperature limits.
Selection Notes
Select this component for applications requiring robust current control without complex external sequencing. The DMOS technology offers higher power density compared to older bipolar designs. Consider the ±1.5 A continuous current rating against peak load demands. Verify compatibility with the system's logic voltage levels before integration.
Part Context
The A4973 series serves as a direct replacement for the A3953, featuring a transition from bipolar to DMOS technology. This upgrade results in smaller device size, higher power density, and improved switching performance. The A4973SB-T specifically denotes the DIP-16 package version within this family.
Replacement Considerations
The A4973 is documented as a direct replacement for the A3953. When substituting, verify pin compatibility and ensure the new DMOS-based device meets the thermal and electrical requirements previously handled by the bipolar predecessor.
