A5931KLPTR-T

Overview

The A5931KLPTR-T is a three-phase sensorless fan driver manufactured by Allegro MicroSystems. It operates within a supply voltage range of 4.5 V to 16 V and supports output currents up to 3 A. The device integrates an internal regulator for logic power and features a fixed switching frequency of 400 kHz. Designed for surface-mount installation, it utilizes a QFN-24 package with exposed thermal pad. The component functions across an extended temperature range from -40°C to +105°C, ensuring reliable performance in automotive and industrial cooling applications.

Feature Summary

• Sensorless control architecture eliminates the need for external Hall-effect sensors
• Integrated linear regulator provides stable logic supply voltage
• Fixed-frequency PWM operation simplifies external component requirements
• Built-in thermal shutdown protects against overheating conditions

Applications

• Automotive cabin cooling fans
• Engine compartment ventilation systems
• Industrial equipment cooling solutions
• Consumer appliance brushless DC motor drives

Procurement Notes

Verify the specific suffix KLPTR-T against official Allegro MicroSystems documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with your PCB footprint design, particularly regarding the QFN-24 thermal pad requirements. Cross-reference the datasheet for any recent revisions that may affect pinout or electrical characteristics before finalizing procurement orders.

Selection Notes

Select this component when designing sensorless BLDC fan control circuits requiring integrated power stage capabilities. The fixed 400 kHz frequency suits applications where electromagnetic interference filtering must be minimized. Consider the QFN-24 package for compact designs needing efficient heat dissipation through the bottom pad. Verify input voltage ranges align with your system's power supply rails.

Part Context

This part belongs to the A5931 series of three-phase motor drivers designed specifically for fan applications. It represents a solution for replacing discrete MOSFET implementations with a single integrated chip. The series focuses on reducing bill-of-materials count while maintaining robust performance in harsh environments typical of automotive and industrial sectors.

Replacement Considerations

Check for direct substitutes like the A5931GLPTR-T if TSSOP-16 packaging is preferred over QFN-24. Verify functional equivalence regarding current ratings and operating voltage ranges before substitution.