Ultra-Quiet, Code-Free, FOC Sensorless BLDC Motor Controller



Top Features


The A89301 is a 3-phase, sensorless, brushless DC (BLDC) motor driver (gate driver) which can operate from 5.5 to 50 V—one of Allegro’s first QuietMotion solutions. The A89301 is ideal for ceiling fans, pedestal fans, bathroom exhaust fans and premium home appliance fans and pumps.

A field-oriented control (FOC) algorithm is fully integrated to achieve the best efficiency and acoustic noise performance. The device optimizes the motor startup performance in a stationary condition, a windmill condition, and even in a reverse windmill condition. 

Motor speed is controlled through analog, PWM, or CLOCK input. Closed-loop speed control is optional, and RPM-to-clock frequency ratio is programmable.

A simple I2C interface is provided for setting motor-rated voltage, rated current, rated speed, resistance, and startup profiles. The I2C interface is also used for on/off control, speed control, and speed readback.

The A89301 is available in a 24-contact 4 mm × 4 mm QFN with exposed thermal pad (suffix ES). The package is lead (Pb) free, with 100% matte tin leadframe plating.


QuietMotion logo

  • Coding-free sensorless field-oriented control (FOC)
  • I2C interface for speed control and status readback
  • Ultra-quiet low speed operation
  • Proprietary non-reverse fast startup
  • Soft-On Soft-Off (SOSO) for quiet operation
  • Analog / PWM / Clock mode speed control
  • Closed-loop speed control
  • Configurable current limit
  • Windmill startup operation
  • Lock detection
  • Short-circuit protection (OCP)
  • Brake and direction inputs
  • Adjustable gate drive

Part Number Specifications and Availability

Documentation and Resources


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