5V, 5A Buck (Step-Down) Regulator - Design Note 48

Overview

This design document describes a step-down DC/DC converter based on the Linear Technology LT1074 switching regulator IC. The circuit converts an input voltage range of 8V to 40V DC into a regulated 5V DC output capable of delivering up to 5A. Operating at a 100kHz switching frequency, the design includes thermal protection and current limiting features. The document provides a full schematic, performance specifications, and a complete bill of materials using off-the-shelf parts. It highlights a typical load and line regulation of 0.5% and explains an optional output filter configuration to reduce ripple from 50mVp-p to 5mVp-p.

Referenced Parts