Step-down switching regulators, also called buck converters, output a regulated voltage level that is less than the input voltage. Modern step-down switching regulators and controllers are available with internal architectures that are optimized for applications that have specific goals, such as power savings, high efficiency, or low cost.

The most modern step-down regulators and controllers offer high switching frequencies, very efficient internal switching elements, and built-in circuit protections.

Visit our switching regulators application page for selection information by application.

Learn about modern switching regulator technology to understand how to differentiate a modern switching regulator IC from those using older technology.

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Reference Designs

Palo Verde (MAXREFDES33#): Step-Down Converter

The Palo Verde (MAXREFDES33#) subsystem design features a highly efficient, synchronous DC-DC co...

MR-16 LED Driver with a 5V Auxiliary Output to Power a Pulsating LED Cooler

Reference design consisting of a white LED driver for an MR-16 LED light combined with a 5V powe...

A Triple-Output ±5% Regulated High Efficiency POE (Power over Ethernet) Supply

Described below is a triple-output 3.12 watts high efficiency POE power supply that has +/- 5% r...

Current-Limit Circuit for the Buck Regulator

This article demonstrates how to achieve current limit for the MAX1692 buck regulator by using a...