A4941: Three-Phase Sensorless Fan Driver

Description

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.

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.

Top Features

  • 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A4941GLP-T 16-lead TSSOP -40°C to 105°C Yes View Data Not for new design Contact your
local sales rep
Check
Distributor Stock
A4941GLPTR-T 16-lead TSSOP -40°C to 105°C Yes View Data Not for new design Contact your
local sales rep
Check
Distributor Stock
APEK4941GLP-01-T DEMO BOARD -40°C to 105°C No -- Not for new design Contact your
local sales rep
Check
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.

Packaging

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

LP 16-pin TSSOP