A4911KJPTR-T

Overview

The A4911KJPTR-T is an automotive-grade, three-phase MOSFET gate driver with integrated current sense amplifiers, designed for Brushless DC (BLDC) motor control applications. It operates within a supply voltage range of 5.5V to 50V and supports a junction temperature range from -40°C to +150°C. The device is housed in a 48-lead LQFP package with an exposed pad (7x7 mm). It features programmable gate drive voltages of 8V or 11V, adjustable dead-time from 100ns to 3.15μs, and three independent current sense amplifiers with programmable gain ranging from 10 V/V to 50 V/V.

Feature Summary

• Integrated ASIL-capable safety architecture with comprehensive fault detection including overcurrent, undervoltage, overtemperature, and bootstrap under-voltage monitoring.
• Three independent high-bandwidth current sense amplifiers with programmable gain and offset for precise motor phase current monitoring.
• Flexible control interface supporting direct logic inputs or SPI serial communication for configuration and diagnostic access.
• Optimized EMC performance through programmable gate drive strength and voltage settings, alongside 100% duty cycle capability via internal charge pump management.

Applications

• Automotive BLDC motor drives requiring ASIL functional safety compliance
• High-power inductive load switching in automotive environments
• Electric power steering and cooling fan systems

Procurement Notes

Verify the specific suffix 'KJPTR-T' against the manufacturer's official datasheet to confirm pinout, thermal pad configuration, and packaging details. Ensure compatibility with your PCB footprint for the 48-LQFP-EP package. Confirm that your system design accounts for the specified operating temperature range and humidity sensitivity levels prior to integration.

Selection Notes

Select this component when designing BLDC motor controllers that require integrated current sensing and high reliability in automotive environments. It is suitable for applications needing flexible gate drive configurations and robust diagnostic capabilities. Consider the SPI interface if digital control and real-time parameter adjustment are required over simple logic input schemes.

Part Context

This part belongs to the A4911 series from Allegro MicroSystems, which focuses on automotive-grade motor drivers. The series is characterized by its integration of power stages, gate drivers, and diagnostic features into a single compact solution, reducing bill-of-materials complexity for high-performance motor control systems.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify cross-references directly with Allegro MicroSystems engineering support or authorized distributors to ensure functional and pin-to-pin compatibility before substitution.

FAQ

What is the maximum operating junction temperature for the A4911KJPTR-T?

The maximum operating junction temperature is +150°C.

Does the A4911KJPTR-T include built-in current sensing?

Yes, it integrates three independent current sense amplifiers with programmable gain and offset voltage capabilities.

What control interfaces are supported by this device?

The device supports both direct logic inputs (HA/LA, HB/LB, HC/LC) and an SPI serial interface for configuration and diagnostics.