L9679B

Specialized Overview

The L9679B is an automotive-grade Special Purpose IC (SPIC) designed for advanced airbag systems. It functions as a System Power Supply (SPS) and Airbag Control Unit, integrating power management with squib deployment drivers. The device supports system voltage diagnostics via an integrated ADC and provides eight-channel high-side/low-side driver outputs for squib deployment, supporting up to 25 V maximum deployment voltage. It includes current monitoring and diagnostic features such as R-measure, STB, STG, and leakage checks. The component is qualified under AEC-Q100 standards and operates within a temperature range of -40°C to +125°C.

Specialized Feature Summary

• Integrates eight-channel HSD/LSD drivers for squib deployment with configurable profiles
• Includes boost regulators for energy reserve and PSI-5 SYNC pulse generation
• Features integrated ADC for system voltage diagnostics and sensor interface
• Provides comprehensive diagnostic capabilities including FET tests and leakage detection

Specialized Applications

• Advanced airbag systems in mature automotive markets
• Cut-off battery systems for integrated safety applications
• Satellite sensor communication interfaces

Specialized Procurement Notes

The L9679B is listed as a discontinued product by the manufacturer. Availability is restricted, and distributors may not stock this item in all regions. Verification of end-of-life status and last-time-buy dates is required before design inclusion. Sourcing should be confirmed through authorized channels to ensure authenticity and handling compliance.

Specialized Selection Notes

Select the L9679B for designs requiring integrated power supply and squib control in a single package. It is compatible with the L9678 and L9680 families. Ensure the application utilizes the TQFP100 exposed pad down package. Verify that the system requirements align with the 25 V max deployment voltage and the specific SPI configuration needs for the chosen deployment profiles.

Specialized Part Context

The L9679B belongs to STMicroelectronics' L967x family of automotive PMICs. This family is designed for safety-critical applications, offering high integration levels to reduce board space and component count. The devices are characterized by their robust diagnostic features and compliance with automotive reliability standards, specifically targeting airbag and restraint control unit architectures.

Specialized Replacement Considerations

The L9679E is an active part within the same family, offering compatibility with L9679 and L9680 devices. It features a 48-pin package and similar functional blocks. Designers should evaluate pinout differences and package dimensions when transitioning from the discontinued L9679B to the L9679E or other family members.