What is a switching regulator, Switching voltage regulators, switch

 The ISL81801 operates over wide input- and output-voltage ranges: 4.5V to 80V at the input, producing an output between 0.8V and 80V. To perform buck-boost conversion, the ISL81801 uses a proprietary control algorithm: it implements valley current modulation in boost mode, and peak current modulation for buck mode control, and switches smoothly from one mode to the other.

https://www.futureelectronics.com/resources/ftm/connectivity/renesas-isl81801-synchronous-buck-boost-controller