A4949GLJTR-6-T

Overview

The A4949GLJTR-6-T is a three-phase sensorless sinusoidal fan driver manufactured by Allegro MicroSystems. It operates within a load voltage range of 4 V to 18 V and delivers an output current of 1 A. The device features a quiescent supply current of 33 uA and supports a switching frequency of 30 kHz. Designed for surface mount technology, it utilizes an SOICN-8 package with an exposed power pad. The component functions across a temperature range of -40°C to +105°C.

Feature Summary

• Generates 180-degree sinusoidal drive waveforms to minimize audible noise and vibration in cooling fans.
• Employs proprietary control algorithms to dynamically optimize efficiency across a wide speed range without external sensors.
• Supports PWM speed input for direct digital control without requiring external variable power supplies.

Applications

• Three-phase brushless DC (BLDC) fan drivers
• Low audible noise cooling systems
• Vibration-sensitive electronic equipment

Procurement Notes

Verify the specific suffix GLJTR-6-T against official datasheets to confirm pinout and thermal pad configuration. Ensure compatibility with SOICN-8 footprint designs. Confirm humidity sensitivity handling requirements during assembly. Validate that the 1 A output current meets system load demands. Check for RoHS compliance documentation if required by regional regulations.

Selection Notes

Select this component when sinusoidal drive is required to reduce acoustic emissions compared to trapezoidal alternatives. Choose based on the need for PWM speed control integration. Consider the exposed pad package for thermal management in enclosed spaces. Verify that the 4 V minimum operating voltage aligns with the system power rail. Assess the 33 uA standby current for low-power applications.

Part Context

This part belongs to the A4945-A4949 series of three-phase motor controllers. The A4949 variant specifically distinguishes itself by supporting PWM speed input, whereas the A4945 uses analog input. Both share the same core sinusoidal drive architecture and mechanical packaging options.

Replacement Considerations

The A4945GLJTR-6-T is a functional substitute within the same family, differing primarily in speed control interface (analog vs. PWM). Verify pin compatibility and control signal requirements before substitution.