A4941: Three-Phase Sensorless Fan Driver

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.


Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • 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

The A4941 is provided in a 16-pin TSSOP package (suffix LP) with an exposed thermal pad.

LP 16-pin TSSOP 


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Product Image Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A4941GLP-T 16-lead TSSOP -40°C to 105°C Yes View Data Contact your
local sales rep
Check Stock
A4941GLPTR-T 16-lead TSSOP -40°C to 105°C Yes View Data Contact your
local sales rep
Check Stock
APEK4941GLP-01-T DEMO BOARD -40°C to 105°C No -- Contact your
local sales rep
Check Stock

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