Here’s a tutorial from Maxim on DC to DC converter design. Buck, boost, inverting and flyback topologies are covered. Diagrams, equations, and control techniques are available for these four common topologies.
Switching power supplies offer higher efficiency than traditional linear power supplies. They can step-up, step-down, and invert. Some designs can isolate output voltage from the input. This article outlines the different types of switching regulators used in DC-DC conversion. It also reviews and compares the various control techniques for these converters.