Switching regulators for efficient step-down rails.
A buck converter stores energy in an inductor and switches it to the output at a duty cycle that sets voltage. Efficiency beats linear regulators when Vin − Vout is large.
Design inputs
Inductor value and saturation current from the IC datasheet equations
Input and output capacitors for ripple and load steps
Feedback resistors for adjustable parts; check layout for the switch node
Widely used examples
Examples for orientation only. Not an offer, stock list, or complete parametric search.