Quick Start Guide for DC1171A Synchronous Buck Converter (LTC3851EGN)

Overview

The DC1171A demonstration circuit is a single-output synchronous buck converter based on the LTC3851EGN controller. It operates with an input voltage range of 4.5V to 14V and provides a regulated 1.5V output at up to 15A. The board is available in two configurations: DC1171A-A, which utilizes an on-board sense resistor for current feedback, and DC1171A-B, which uses inductor DCR sensing to improve full-load efficiency. Key features include an internal 5V linear regulator, adjustable soft-start or rail tracking, and selectable operating modes including CCM, pulse skip, and Burst Mode. The document includes detailed performance specifications, setup procedures, and a complete schematic diagram.

Referenced Parts