Groundbreaking Hot-Swap and Ideal-Diode Controller by STMicroelectronics for Automotive Safety-Critical Systems up to ASIL-D
STMicroelectronics has introduced the market's first automotive-qualified integrated hot-swap and ideal-diode controller, the STPM801, designed for functional-safety applications. This innovative controller replaces conventional Schottky diodes with an external MOSFET for reverse-input protection and output-voltage holdup. By reducing the voltage drop across the MOSFET, power dissipation during normal operation is minimized compared to traditional diodes. Additionally, the integrated circuit features power ORing functionality, enabling seamless switching between main and backup batteries to ensure uninterrupted power supply to safety-critical equipment, including autonomous driving and advanced driver assistance systems (ADAS).
To safeguard loads during hot-swap events, the STPM801 incorporates an integrated hot-swap controller that drives an external N-channel MOSFET. A soft-start function efficiently manages the turn-on transient of the second MOSFET, preventing high inrush currents by charging a known-value capacitor connected to its gate at a constant current. The device's overvoltage and undervoltage pins provide protection by cutting off the output voltage when the input voltage deviates from specified thresholds. Moreover, the STPM801 includes advanced protection features and monitoring capabilities, making it suitable for functional safety requirements in automotive systems up to Automotive Safety Integrity Level (ASIL) D, as defined by ISO 26262.
With a compact 5mm x 5mm VFQFN-32 package, the STPM801 not only saves PCB space but also reduces the need for external components. It operates within a wide supply voltage range of 4V to 65V, with a low quiescent current of 25µA, ensuring resilience against automotive electrical hazards and minimizing battery drain when the vehicle is powered off. The versatile STPM801 finds application in various automotive systems, including zonal/body electronic control units (ECUs), ADAS ECUs, high-performance computing ECUs, infotainment ECUs, redundant power delivery systems, and dual-battery setups.
Key features of STPM801
- AEC-Q100 qualifiedWide input voltage range: 4 V to 65 V
- Reverse input protection (-65 V)
- Integrated charge pump
- Input overvoltage protection
- Input undervoltage protection
- Output overcurrent protection
- Compliant with 16750 AC ripple test
- Developed for ASIL D applications
The STPM801 is currently in mass production and can be obtained for $3.00 per 1000 pieces.