A4941GLPTR-T

Overview

The A4941GLPTR-T is a three-phase sensorless fan driver manufactured by Allegro MicroSystems. It incorporates back-electromotive force (BEMF) sensing to eliminate the need for Hall sensors in fan applications. The device accepts a pulse-width modulated (PWM) input for speed control or as an on/off switch, enabling low-power standby modes. Key electrical characteristics include a supply voltage range of 5.5 V to 50 V and a TSSOP-28 package with 28 pins. Operating temperatures span from -40 °C to +105 °C.

Feature Summary

• Sensorless operation utilizing BEMF sensing to remove Hall sensor requirements
• PWM input capability for variable speed control and low-power standby mode activation
• Integrated lock detection and optional overcurrent protection mechanisms

Applications

• Three-phase brushless DC fans requiring sensorless control
• Ceiling fans and pole fans
• Systems demanding reduced audible noise through soft switching

Procurement Notes

Verify the specific suffix GLPTR-T against official Allegro MicroSystems documentation to confirm pinout and thermal specifications. Ensure compatibility with the target PCB footprint and voltage requirements. Cross-reference datasheet revisions to validate feature sets such as automotive qualification status if applicable.

Selection Notes

Select this component for applications requiring sensorless three-phase motor control without external magnetic sensors. It is suitable for designs needing PWM-based speed regulation and energy-efficient standby states. Evaluate thermal performance within the specified operating temperature range and ensure adequate heat dissipation for the TSSOP-28 package.

Part Context

This part belongs to the A4941 series of three-phase motor drivers designed specifically for fan applications. It integrates control logic and power stages into a single compact package. The series emphasizes minimal external component count and cost-effective implementation for consumer and industrial cooling solutions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.