L9680

Specialized Overview

The L9680 is an automotive-grade chip designed for advanced airbag systems in mature markets and cut-off battery systems in integrated safety applications. It features family compatibility with the L9678 and L9679 devices, enabling high-power supply currents and an integrated active wheel speed sensor interface. This interface shares functionality with the PSI-5 satellite interface to create a generic remote safety sensor interface compliant with both systems. The device utilizes a high-frequency power supply design operating at 1.882 MHz, allowing for smaller external components. It includes integrated synchronous rectifiers in buck converters and electrically isolated ER capacitor circuits for in-rush current control and diagnostics.

Specialized Feature Summary

• Integrated active wheel speed sensor interface compatible with PSI-5 satellite protocols
• High-frequency switching regulators operating at 1.882 MHz with integrated synchronous rectifiers
• Electrically isolated ER capacitor management with fixed charge current and discharge circuits
• User-selectable ECU logic voltage (3.3 V or 5.0 V) and energy reserve output voltage (23 V or 33 V)

Specialized Applications

• Advanced airbag systems for mature automotive markets
• Cut-off battery systems for integrated safety applications

Specialized Procurement Notes

Verify AEC-Q100 qualification status and specific package availability through official STMicroelectronics distributors. Confirm deployment voltage settings and SPI configuration requirements against system specifications. Ensure compatibility with existing L9678/L9679 infrastructure if upgrading. Check for updated documentation regarding the shared remote safety sensor interface compliance.

Specialized Selection Notes

Select this component when designing airbag or safety systems requiring integration with active wheel speed sensors or PSI-5 satellites. Consider its high-frequency operation benefits for reducing external component size. Evaluate the user-selectable voltage options for ECU logic and energy reserve outputs. Verify that the integrated diagnostics for ER capacitor capacitance and ESR meet system integrity requirements.

Specialized Part Context

The L9680 belongs to a family of safety system integration chips including the L9678 and L9679. It extends capabilities by providing higher power supply currents and specialized interfaces for remote sensors. This positioning supports complex automotive safety architectures where direct sensor integration and robust energy reserve management are critical for system reliability and compliance.

Specialized Replacement Considerations

The L9680 is family-compatible with the L9678 and L9679 devices. Substitution within this family requires verification of pinout compatibility and functional equivalence regarding the active wheel speed sensor interface and deployment profiles.