LM3489EVAL/NOPB 产品设计参考手册 - TI（德州仪器）

User's Guide

SNVA160A–May 2006–Revised April 2013

AN-1471 LM3489 Demonstration Board

1 Introduction

The LM3489 is a high efficiency PFET switching regulator controller that can be used to quickly and easily

develop a small, cost effective, switching buck regulator for a wide range of applications. The hysteretic

control architecture provides for simple design without any control loop stability concerns using a wide

variety of external components. The PFET architecture also allows for low component count as well as

ultra-low dropout, and 100% duty cycle operation. Another benefit is high efficiency operation at light loads

This LM3489 demonstration board provides a 3.3 V output with 500 mA nominal load capability (maximum

1A) from a wide input voltage range of 7 V to 28 V. The reference design is optimized for overall

conversion efficiency. This document contains the demo board schematic, PCB layout, Bill of Materials

(BOM) and typical operating waveforms are provided for reference.

2 Evaluation Board Schematic

Figure 1. LM3489 Evaluation Board Schematic

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SNVA160A–May 2006–Revised April 2013 AN-1471 LM3489 Demonstration Board

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