L9691-TR

Specialized ICS Overview

The L9691-TR is an automotive-grade, 16-channel airbag system chip designed for advanced passive safety applications. It integrates high-frequency power supplies operating at 2 MHz with synchronous rectifiers to optimize external component costs. The device features a boost regulator for energy reserve and two fully isolated deployment voltage regulators set to a nominal 18 V. It includes integrated safing logic using a rolling average algorithm, dual SPI interfaces for global and remote sensor functions, and a LIN interface for OCS message decoding. Qualified under AEC-Q100, it supports single-chip or master/slave configurations.

Specialized ICS Feature Summary

• Integrated 2 MHz switching regulators with synchronous rectifiers for efficient power management
• Two fully isolated deployment voltage regulators with user-selectable output voltages (24 V/33 V ±6%)
• Dual SPI interfaces separating device global functions from remote sensors
• Integrated safing logic with programmable thresholds and rolling average algorithm

Specialized ICS Applications

• Advanced automotive airbag systems
• Passive safety control units
• Master/slave airbag configurations

Specialized ICS Procurement Notes

Verify the package type against specific project requirements. Local data indicates a 128-TQFP Exposed Pad package in Tape & Reel format. Confirm that this physical form factor matches the PCB layout design before procurement, as other variants may exist in different packages.

Specialized ICS Selection Notes

Select this component for systems requiring high integration of power supply and squib driving functions. Ensure the design accommodates the 128-TQFP footprint if adhering to local specifications. Verify compatibility with the required deployment voltage profiles and sensor interface protocols such as PSI-5 v2.3.

Specialized ICS Part Context

The L9691 belongs to STMicroelectronics' portfolio of Chassis and Safety ICs, specifically targeting the global airbag market. It is part of a scalable solution family that supports various platform requirements, from cost-optimized entry-level vehicles to high-end centralized safety domain controllers compliant with ISO 26262 standards.

Specialized ICS Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult official manufacturer documentation for cross-reference information.