L9788TR

Power Management - Specialized Overview

The L9788TR is a multifunction PMIC for automotive engine management, designed for four-cylinder internal combustion engines. It integrates power supplies and signal preprocessing peripherals in an LQFP-100 package. Key electrical features include one pre-boost regulator, one pre-buck regulator, one linear 5V regulator with 1A output, and three independent self-protection 5V tracking regulators with 150mA output. It provides extensive driver channels: four LS injector drivers, two LS O2H drivers with current sense, two LS camshaft/solenoid drivers, five LS relay drivers, two LS LED drivers, three LS/HS smart start drivers, one LS main relay driver with reverse battery protection, five external FET pre-drivers, and six igniter pre-drivers.

Power Management - Specialized Feature Summary

• Provides complete power supply and signal preprocessing infrastructure for controlling four-cylinder internal combustion engines
• Integrates multiple low-side and high-side drivers with specific configurations for injectors, relays, LEDs, and ignition systems
• Includes built-in safety mechanisms such as short circuit, over-current, and over-temperature protection across all channels
• Supports ISO9141/LIN 2.1 K-Line communication and CAN-FD with wake-up functionality

Power Management - Specialized Applications

• Automotive engine control units (ECU) for four-cylinder internal combustion engines
• Fuel injection system management
• Ignition coil driver circuits
• Vehicle thermal and sensor monitoring systems

Power Management - Specialized Procurement Notes

Verify the component matches the LQFP-100 exposed pad package specification. Confirm AEC-Q100 qualification status and ISO26262 compliance requirements for your specific application. Ensure the revision level aligns with your design documentation. Cross-reference the manufacturer part number to avoid counterfeit components. Validate that the trailing suffix corresponds to the correct tape and reel configuration if applicable.

Power Management - Specialized Selection Notes

Select this IC when designing an ECU for a four-cylinder engine requiring integrated power regulation and diverse actuator driving capabilities. It is suitable for applications needing coordinated soft-start regulators and robust fault protection. Consider its compatibility with ST microcontrollers like the SPC563M series. Evaluate the need for its specific driver counts against your system's channel requirements before finalizing the bill of materials.

Power Management - Specialized Part Context

The L9788 is part of STMicroelectronics' portfolio of specialized power management ICs for automotive applications. Manufactured using proprietary BCD technology, it consolidates functions that would otherwise require multiple discrete components. This integration reduces board space and simplifies the design process for complex engine management systems, ensuring reliability under harsh automotive operating conditions.

Power Management - Specialized Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.