L9903

Overview

The L9903 is a control circuit for power MOS bridge drivers in automotive applications, featuring an ISO 9141 bus interface. It supports PWM operation with frequencies up to 30 kHz and includes programmable cross-conduction protection time. The device operates within a supply voltage range of 8 V to 20 V, with a maximum overvoltage rating of 40 V. Quiescent current in standby mode is less than 50 μA. An integrated step-up converter allows operation at 6 V. Protection features include overvoltage, undervoltage, short circuit, and thermal safeguards.

Feature Summary

• ISO 9141 compatible interface for automotive communication
• Integrated charge pump for driving power MOSFETs
• Real-time diagnostic capabilities for system monitoring
• Reverse battery protection via step-up converter

Applications

• Automotive power MOS bridge driver control
• ISO 9141 bus interface systems
• Motor control circuits requiring reverse battery protection

Procurement Notes

Verify the specific package variant and temperature grade required for your automotive application. Confirm that the ISO 9141 interface timing matches your system controller specifications. Ensure the operating voltage range aligns with your vehicle's electrical architecture, particularly regarding the 6 V step-up converter functionality. Check for any specific ordering suffixes that may indicate different packaging or testing levels.

Selection Notes

Select this component when an integrated solution for driving power MOS bridges with ISO 9141 compatibility is needed. It is suitable for applications requiring robust protection against short circuits, thermal issues, and reverse polarity. Consider the 30 kHz PWM frequency limit and the 50 μA standby current when designing for efficiency and switching speed requirements in automotive environments.

Part Context

The L9903 belongs to STMicroelectronics' portfolio of automotive interface ICs designed for reliable operation in harsh environments. It integrates control logic with power driver support, simplifying the design of complex motor and load management systems. The device leverages BCD technology to combine high-voltage handling with precise digital control, addressing common challenges in automotive electronic control units.

Replacement Considerations

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