4-switch automotive buck-boost preregulator based on NCV81599 and NVTFS5C460NL

This automotive buck−boost pre−regulator reference design describes the operation and performance for a typical pre−regulator application needed in various automotive applications like ADAS, gateway and infotainment. It ensures proper supply of all subsequent loads and regulators to ensure uninterrupted operation, even at significant input voltage variation. The design demonstrates the NCV81599 controller capabilities and incorporates four NVTFS5C460NL 40 V N−channel FETs for the power stage. It is intended for the power supply designer to adopt the circuit directly into a typical system design, making only minimal component changes based on system requirements. The design is meant to be a complete solution, but it also provides access to key features of the NCV81599. These include wide input voltage range from 4.5 V to 32 V, dynamically programmed frequency from 150 kHz to 1.2 MHz, I2C interface, independent input and output current sensing, over−voltage and over−current protection as well as over−temperature protection.