STMicroelectronics' Hot-Swap and Ideal-Diode Controller up to ASIL-D
June 22, 2023
News
Geneva, Switzerland. STMicroelectronics released its STPM801, the first automotive-qualified integrated hot-swap and ideal-diode controller for functional-safety applications. An external MOSFET is controlled by the ideal-diode managing the reduction of power while operating at normal capacity. In case of an anomaly, the MOSFET safeguards the reverse current transients.
To ensure uninterrupted energy to safety-critical systems, like ADAS, the ideal-diode controller circuit also provides power ORing to flip between main and backup power. The hot-swap controller operates a second external N-channel MOSFET to protect current through hot-swapping.
.According to STMicroelectronics, “a soft-start function controls the turn-on transient of this second MOSFET by charging a capacitor of known value connected to its gate at constant current to avoid high inrush currents.” The over-, under-voltage pins cut output power when input voltage is outside set parameters.
The STPM801 operates from a 4V-65V supply with 25µA quiescent current for maximum protection against electrical disruptions and diminished battery energy when power is off. Packaged in a 5mm x 5mm VFQFN-32 footprint, the STPM801 is ideal in zonal/body ECUs, ADAS ECUs, high-performance computing ECUs, infotainment ECUs, redundant power delivery systems, and dual-battery systems, and suitable for applications requiring up to Automotive Safety Integrity Level (ASIL) D according to ISO 26262.
For more information, visit st.com
Chad Cox. Production Editor, Embedded Computing Design, has responsibilities that include handling the news cycle, newsletters, social media, and advertising. Chad graduated from the University of Cincinnati with a B.A. in Cultural and Analytical Literature.
