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Product Detailed Parameters
- Description：Motor Driver ICs Controller - Sp
- Series：-
- Mfr：Allegro MicroSystems
- Package：Bulk
- Motor Type - Stepper：-
- Motor Type - AC, DC：Brushless DC (BLDC)
- Function：Controller - Speed
- Output Configuration：Pre-Driver - Half Bridge (3)
- Interface：Parallel
- Technology：Power MOSFET
- Step Resolution：-
- Applications：General Purpose
- Current - Output：-
- Voltage - Supply：8V ~ 37.5V
- Voltage - Load：-
- Operating Temperature：-40°C ~ 105°C (TA)
- Mounting Type：Surface Mount
- Package / Case：28-VFQFN Exposed Pad
- Supplier Device Package：28-QFN-EP (5x5)
- Grade：-
- Qualification：-
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Overview
The A4931GETR-T is a three-phase brushless DC motor pre-driver manufactured by Allegro MicroSystems. It provides direct, high-current gate drive for an all N-channel power MOSFET three-phase bridge. The device operates with a supply voltage range of 8 V to 37.5 V and features a typical switching frequency between 20 kHz and 30 kHz. It includes three Hall element inputs, a sequencer for commutation control, fixed off-time PWM current control, and locked rotor protection. The component is housed in a 28-QFN (5x5 mm) package with an exposed pad.
Feature Summary
- Provides direct high-current gate drive for external N-channel power MOSFETs
- Integrates a sequencer for automatic commutation control based on Hall sensor inputs
- Includes fixed off-time PWM current regulation and locked rotor detection
- Features synchronous rectification to reduce power consumption during current decay
Applications
- Brushless DC motor control systems
- Fan and blower speed regulation
- General purpose motion control applications
Procurement Notes
Verify the exact suffix against official Allegro documentation, as distributor listings may vary. Confirm moisture sensitivity levels and reflow soldering profiles prior to assembly. Ensure the ordering part number matches the specific tape and reel configuration required for your manufacturing process. Cross-reference the datasheet revision date to confirm compatibility with your design specifications.
Selection Notes
Select this component when designing a system requiring a dedicated pre-driver for external MOSFETs rather than an integrated driver. It is suitable for applications needing precise commutation via Hall sensors and robust protection features like thermal shutdown and undervoltage lockout. Consider the 28-QFN package constraints for thermal management and PCB layout requirements.
Part Context
The A4931 belongs to Allegro's family of three-phase BLDC motor pre-drivers. It is designed to work with external power stages, offering flexibility in current handling based on the selected MOSFETs. This series supports various industrial and consumer motor control applications requiring reliable commutation and protection.
Replacement Considerations
The A4936 and A4938 are documented similar three-phase brushless DC motor pre-drivers from Allegro MicroSystems. Verify pinout compatibility and electrical specifications before substitution.
