Voltage regulator, regulators, voltage reference, voltage regulators

The switch’s duty cycle sets the amount of charge transferred to the load. This is controlled by a feedback mechanism like that of a linear regulator. Switching regulators are efficient because the series element is either fully conducting or switched off because it dissipates almost no power.

https://www.futureelectronics.com/p/analog--regulators-reference--switching-regulators/l5972d-stmicroelectronics-9903873