48031 Automotive Airbag System Basis Chip - Boost Regulator, 4 Squib Drivers, SPI, PSI-5

48031 is a highly integrated system basis chip (SBC) engineered specifically for automotive airbag control units and battery cutoff systems.

This IC combines all essential power management and communication functions required in a modern airbag ECU.
It features a high-frequency boost regulator that manages the energy reserve voltage, with a user-selectable output of 23V or 33V, ensuring reliable deployment power is available during emergency conditions.

The device integrates user-configurable linear power supplies to support the microcontroller, onboard sensors, and communication transceivers.
For deployment control, it includes a 4-channel squib/pyroswitch driver with high-side and low-side switches, supporting programmable firing profiles up to 1.75A with various timing configurations.

Diagnostics are a core strength of this chip.
It offers system voltage supervision, an integrated ADC for analog measurements, and comprehensive diagnostics for the firing loops including leakage detection and loop resistance measurement.
The built-in safing logic and watchdog timer significantly contribute to a robust safety concept.

Communication with the main MCU is handled via a 32-bit SPI interface.
The chip also supports a PSI-5 remote sensor interface for peripheral satellite sensors, reducing wiring harness complexity.
Operating over an extended temperature range, this AEC-Q100 qualified component ensures dependable performance in harsh automotive environments.