ST releases integrated hot-swap and ideal diode controller for automotive safety-critical applications

Jun 22, 2023 /SemiMedia/ — STMicroelectronics not too long ago launched an built-in hot-swap and ideally suited diode controller, the STPM801, for automotive safety-critical functions as much as ASIL-D. The gadget is the market’s first automotive-qualified built-in hot-swap ideally suited diode controller for useful security functions. 

The best-diode controller drives an exterior mosfet changing a Schottky diode conventionally used for reverse-input safety and output-voltage holdup. The lowered voltage drop throughout the MOSFET reduces energy dissipation throughout regular operation, in comparison with the ahead voltage of the Schottky diode. When a reverse-voltage occasion happens, in case of faults like energy supply failure, brownout or enter short-circuit, turning off the MOSFET blocks the related reverse-current transients. 

The best-diode controller circuit additionally supplies energy ORing, to change between a major and backup battery to make sure uninterrupted provide to safety-critical gear reminiscent of autonomous driving and superior driver help techniques (ADAS).

The built-in hot-swap controller drives a second exterior N-channel MOSFET to guard hundreds throughout hot-swap occasions. A soft-start perform controls the turn-on transient of this second MOSFET by charging a capacitor of identified worth linked to its gate at fixed present to keep away from excessive inrush currents. The overvoltage and undervoltage pins minimize off the output voltage each time the enter voltage shouldn't be inside specified thresholds. 

The STPM801 additionally consists of safety options and monitoring appropriate for functions that meet useful security necessities for techniques as much as Automotive Security Integrity Degree (ASIL) D based on ISO 26262. The options are packaged inside a 5mm x 5mm VFQFN-32 footprint, saving PCB area and minimizing demand for exterior parts. 

Working from a 4V-65V provide voltage, and with 25µA quiescent present, the STPM801 withstands automotive electrical hazards and minimizes battery drain when the automobile is turned off. It's utilized in zonal/physique ECUs, ADAS ECUs, high-performance computing ECUs, infotainment ECUs, redundant energy supply techniques, and dual-battery techniques. 

The STPM801 is in mass manufacturing now and obtainable from $3.00 for orders of 1000 items. For extra data, please go to www.st.com/stpm801