1 Introduction

The LM27402 is a feature-rich, synchronous, single phase PWM DC/DC buck controller. A wide input voltage range of 3-V to 20-V, input voltage feedforward, and dual high current integrated N-channel MOSFET drivers make the LM27402 appropriate for high current intermediate bus system rails in point-of-load applications. A 0.6-V ±1% internal voltage reference enables high accuracy and low voltage capability at the output. Inductor DCR current sensing provides an accurate current limit detection method and promotes high output current and high system efficiency by eliminating resistive current sense elements.

This user's guide describes the steps taken in selecting the external components to build a fully functional DC/DC converter. This user's guide includes diagrams of the evaluation board layout and bill of materials. The evaluation board represents a typical application circuit and can be modified if different specifications are desired. Refer to the LM27402 High Performance Synchronous Buck Controller with DCR Current Sensing data sheet for additional design equations.