Three Phase Sensorless Fan Drivers

A5931, A5931-3

A5931 Product Image


Top Features


The A5931 is a three phase sensorless BLDC fan driver IC that incorporates sinusoidal drive to minimize audible noise and vibration. 

The A5931-3 is the latest in the family with a new feature that allows user to adjust deceleration speed from Force Open Loop to Close Loop.

A flexible closed-loop speed control system is integrated into the IC. This eliminates the requirement for a microprocessor-based system and minimizes programming requirements.

The A5931 devices are available in both commercial and automotive grade.

  • 180° sinusoidal drive - Low audible noise and vibration
  • Motor position using Allegro's sensorless algorithm - Eliminates external Hall sensors
  • Closed-loop speed control
  • Speed curve configuration via EEPROM
  • Lock detection
  • Soft start
  • Standby mode
  • Shorted load protection

16-lead TSSOP with exposed thermal pad (LP package)

LP Package Documentation


24-contact QFN with exposed thermal pad 4 mm x 4 mm x 0.75 mm (ES package)

ES Package Documentation

Part Number Specifications and Availability

Documentation and Resources


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