OnSemi LV5980MC低功率损耗、高效转换降压型稳压器设计方案
OnSemi公司的LV5980MC是一款内嵌P沟道MOSFET的单通道DC-DC转换器，工作电压范围为4.5V至23V，最大输出电流为3A。可实现低功率损耗，操作电流大约为63uA。该芯片具有外部电容软启动、过流保护、欠压及过热关闭等功能特性。本文首先介绍LV5980MC、基本特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。
LV5980MC is 1ch DC-DC converter with built-in power Pch MOSFET.The recommended operating rang is 4.5V to 23V.The maximum current is 3A.The operating current is about 63uA,and low power consumption is achieved.
LV5980MC主要特性：
·1ch SBD rectification DC-DC converter IC with built-in power Pch MOSFET
·Typical value of light load mode current is 63uA
·100mΩ High-side switch
·The oscillatory frequency is 370kHz
·When P-by-P is generated continuously,it shifts to the HICCUP opration
·External capacitor Soft-start
·4.5V to 23V Operating input voltage range
·Output voltage adjustable to 1.235V
·built-in OCP circuit with P-by-P method
·Under voltage lock-out,thermal shutdown
LV5980MC应用：
·Set top boxes
·point of load DC-DC converters
·White Goods
·DVD/Blu-ray™ drivers and HDD
·Office Equipment
·LCD monitors and TVs
·POS System
图1. LV5980MC内部方框图
LV5980MC方案介绍：
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