This slide book uses design insight, real-life examples, illustrative figures, easy-to-follow equations, and simple SPICE code to show how semiconductor devices (diodes, bipolar-junction transistors (BJTs), and metal-oxide-semiconductor (MOS) field-effect transistors (FETs) ) work independently and collectively in switched-inductor power supplies; how these power supplies transfer power, consume power, and react and respond across frequency; how feedback loops switch, control, and stabilize them; and how the building blocks that comprise them are implemented and designed.