Automotive high-side switch controller

ST is shipping an automotive high-side switch controller which combines enhanced system-protection and diagnostic features with ST’s I²-t silicon-fuse technology.



As the first in ST’s new STi²Fuse family with integrated I²-t protection, the VNF1048F is compatible with 12V, 24V, and 48V automotive power subsystems (board nets).

Its flexibility is suitable for the latest automotive zonal electronic/electrical (E/E) architectures that boost efficiency and reliability while supporting increased electrification and extra functions for smart driving.

The  VNF1048F has an SPI for a host MCU to configure and monitor system-protection and diagnostic features.

These include under-voltage and over-temperature protection, thermal protection for the external high-side MOSFET, desaturation shutdown, and I²-t fuse settings. High-precision digital current sensing is built in.

ADCs for monitoring the temperature-sensing thermistor voltage, output voltage, and MOSFET drain-source voltage are also integrated.

ST’s I²-t fuse, a defining feature of the STi²Fuse product family, provides over-current protection. Silicon fuses also help simplify vehicle wiring harnesses and reduce weight by eliminating user-accessible fuse boxes and the associated cabling and installation overheads.

The savings in weight contribute to improving vehicle performance, including extended driving range and reduced CO₂ emissions.

The VNF1048FTR is in production now and available in the QFN 32L 5mm x 5mm 32-lead package, from $1.77 for orders of 1000 pieces.

For more information: www.st.com/sti2fuse.