Three-Phase Sensorless Fan Driver

A4941

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These parts are in production but have been determined to be NOT FOR NEW DESIGN.

This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Date of status change: September 3, 2018.

Description

Top Features

Packaging

The A4941 three-phase motor driver incorporates BEMF sensing to eliminate the requirement for Hall sensors in fan applications.

A pulse wave modulated (PWM) input is provided to control motor speed, allowing system cost savings by eliminating external variable power supply. PWM input can also be used as an on/off switch to disable motor operation and place the IC into a low power standby mode. 

  • Sensorless (no Hall sensors required)
  • Soft switching for reduced audible noise
  • Minimal external components
  • PWM speed input
  • FG speed output
  • Low power standby mode
  • Lock detection
  • Optional overcurrent protection
  • Variant A automotive qualified to AEC-Q100 Grade 2

16-Pin TSSOP with exposed thermal pad (suffix LP) 

Part Number Specifications and Availability

Documentation and Resources

Third Party Design Tools

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Mikroe Brushless 5-Click 3 Phase Sensorless BLDC Motor Controller