L9945TR

Power Management - Specialized Overview

The L9945TR is an automotive-grade, fully configurable 8-channel MOSFET pre-driver designed for 12 V and 24 V battery systems. It supports high-side (N/P-channel), low-side (N-channel), H-bridge, and peak & hold configurations. The device operates with a battery supply voltage of 3.8 V to 36 V and a VDD supply of 4.5 V to 5.5 V. It features programmable gate charge/discharge currents for EMI improvement, individual channel diagnostics for short circuits and open loads, and a 32-bit SPI interface for configuration. Packaged in a 64-TQFP-EP (10x10 mm) surface-mount package.

Power Management - Specialized Feature Summary

• Configurable multi-mode output control supporting independent high/low side, dual H-bridge, or peak & hold load driving
• Comprehensive diagnostic capabilities including individual channel monitoring for battery shorts, ground shorts, and open loads via SPI registers
• Enhanced safety architecture featuring redundant external disable pins, built-in self-test, hardware self-checks, and latched fault storage

Power Management - Specialized Applications

• Engine management systems in passenger vehicles
• Load control in commercial vehicle 24 V battery architectures
• Safety-related actuator driving requiring AEC-Q100 compliance
• H-bridge motor control applications

Power Management - Specialized Procurement Notes

Verify the specific suffix TR indicates tape-and-reel packaging when sourcing. Confirm that the procurement matches the 64-TQFP-EP physical dimensions and lead-free RoHS3 status. Ensure the component grade aligns with automotive AEC-Q100 requirements for the intended application environment. Cross-reference the datasheet revision date to confirm current design specifications.

Power Management - Specialized Selection Notes

Select this component for applications requiring flexible MOSFET pre-driving across multiple topology modes within a single IC. Consider its suitability for environments demanding strict EMI management through programmable slew rates. Evaluate the need for its extensive diagnostic feedback and safety features against system complexity requirements. Verify compatibility with 3.3 V or 5 V logic interfaces for microcontroller integration.

Power Management - Specialized Part Context

The L9945 is part of STMicroelectronics' smart power portfolio utilizing advanced BCD technology. It serves as a central driver for complex automotive loads, replacing discrete driver solutions. The device integrates protection mechanisms for external MOSFETs, simplifying board design while maintaining high reliability standards for critical vehicle functions.

Power Management - Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.