BLDC Fan Driver ICs

Brushless dc fan, brushless dc fans, fan drivers

Solutions for applications requiring brushless DC fan drivers


Allegro has developed a new series of three phase BLDC fan drivers that result in low audible noise and vibration in addition to improved efficiency. These new sinusoidal driven ICs include both sensor-based and sensorless commutated ICs. Typical IC features include: PWM duty or analog voltage for speed control; adaptive phase advance for improved efficiency; rotor lock detection with auto restart; FG speed output; overcurrent protection; under voltage lockout; thermal shutdown and few external components for small PCB footprints and reduce system cost.

Target applications include desktop and notebook PCs, refrigerator and other white good products, ceiling and consumer fans and industrial fans and blowers. For automotive applications Allegro has a series of AEC-Q100 qualified fan driver ICs targeted at seat cooling fans, LED headlamp fans, and battery cooling fan applications.

  Motor Position Sensing Commutation Type
Part Number Application Sensored Sensorless



A4941 All Fans

A4942 Server, Industrial

A4944 Appliance, Industrial

A4945* Appliance, Seat, LED, Battery Cooling

A4949* Appliance, Seat, LED, Battery Cooling

A4946* Seat, LED, Battery Cooling

A4947 Personal Computers

Server, Industrial     

Server, Industrial 
A5940* Appliance, Personal Computers, Seat, LED, Battery Cooling

A5941 Appliances, Personal Computers    
A5943 Appliance, Industrial    
A5944 Notebook Personal Computers    


Pole and pedestal fans,
humidifier and air purifier fans and blowers, Industrial 


 Pole and pedestal fans,
humidifier and air purifier fans and blowers, Industrial



Note: * indicates high temperature or automotive option available


Copyright © 2017 Allegro MicroSystems, LLC

Sitemap  |  Privacy Policy  |  Contact Webmaster

Follow us on: LinkedIn YouTube Google+ Follow Allegro on Twitter

Careers   |   Contact Sales   |   Home   |   Legal   |   Quality & Environment   |   Request Samples