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Product Detailed Parameters
- Description：IC MTR DRVR BIPOLR 3-5.5V 44PLCC
- 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：Logic
- Technology：DMOS
- Step Resolution：1, 1/2, 1/4, 1/8
- Applications：General Purpose
- Current - Output：2.5A
- Voltage - Supply：3V ~ 5.5V
- Voltage - Load：8V ~ 35V
- Operating Temperature：-20°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：44-LCC (J-Lead)
- Supplier Device Package：44-PLCC (16.59x16.59)
- Grade：-
- Qualification：-
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Overview
The A3977SED is a complete microstepping motor driver with an integrated translator, designed for bipolar stepper motors. It features a 44-pin PLCC package and supports full, half, quarter, and eighth-step modes. The device provides ±2.5 A output current and handles up to 35 V load voltage. Logic supply ranges from 3.0 V to 5.5 V. It includes automatic decay mode selection, synchronous rectification, and protection circuits for UVLO, thermal shutdown, and crossover current.
Feature Summary
- Integrated translator simplifies control by accepting single step pulses without complex sequencing
- Automatic detection and selection of slow, fast, or mixed current decay modes
- Synchronous rectification reduces power dissipation during operation
Applications
- Bipolar stepper motor control in industrial automation systems
- Positioning mechanisms in automated teller machines
- Motion control in ticket vending and card reader devices
Procurement Notes
Verify the specific suffix against official Allegro documentation to confirm pinout and electrical characteristics. Ensure the procurement channel provides valid traceability for the 44-PLCC package. Confirm that the component meets required environmental standards for the intended operating temperature range before integration into final assemblies.
Selection Notes
Select this component when a built-in translator is required to reduce microcontroller complexity. It is suitable for applications needing ±2.5 A drive capability at 35 V. Consider the 44-pin PLCC package constraints for PCB layout. Evaluate if the fixed off-time current regulator meets the acoustic noise requirements compared to other Allegro series.
Part Context
The A3977SED belongs to the A3977 family of microstepping DMOS drivers. It shares functional similarities with the A3977SLP but differs in packaging and pin configuration. This part is designed for high-performance stepper motor applications requiring precise step control and efficient power management within a compact integrated circuit solution.
Replacement Considerations
The A5977 is documented as a drop-in replacement for the A3977. Verify compatibility regarding the 28-pin eTSSOP package versus the 44-pin PLCC form factor. Check if the improved hot-swap protection and logic compatibility meet the specific system requirements.
