A4946: Automotive Three Phase Sinusoidal Fan Driver


The A4946 is a low noise, three phase motor driver with integrated power bridge suitable for driving small fans and blowers in automotive systems. Motor audible noise and vibration is reduced by driving the phases with sinusoidal PWM excitation. Motor current is controlled using PWM techniques to minimize the power dissipation.

Rotor position is determined by Hall effect elements. These provide direct inputs to the integrated commutation and excitation logic.

Additional product technical information and datasheets are available by contacting the Allegro Factory.

Top Features

  • 180° sinusoidal drive - low audible noise and vibration
  • Motor position using external Hall sensors
  • AEC-Q100 Qualified - suitable for automotive applications

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A4946GLPTR-T 16-lead TSSOP -40°C to 105°C Yes View Data Contact your
local sales rep
Distributor Stock
APEK4946GLP-01-T DEMO BOARD -40°C to 105°C No -- Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.



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