OnSemi LV5980MC低功率损耗、高效转换降压型稳压器设计方案

1、OnSemi LV5980MC低功率损耗、高效转换降压型稳压器设计方案关键词：LV5980MC,转换降压型稳压器,电源管理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

2、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 MOSFETTypical value of light load mode current is 63uA100m High-side

3、switchThe oscillatory frequency is 370kHzWhen P-by-P is generated continuously,it shifts to the HICCUP oprationExternal capacitor Soft-start4.5V to 23V Operating input voltage rangeOutput voltage adjustable to 1.235Vbuilt-in OCP circuit with P-by-P methodUnder voltage lock-out,thermal shutdownLV5980

4、MC应用：Set top boxespoint of load DC-DC convertersWhite GoodsDVD/Blu-ray drivers and HDDOffice EquipmentLCD monitors and TVsPOS System图1. LV5980MC内部方框图LV5980MC方案介绍：The LV5980MC is a fixed 370 KHz, high-output-current, Non-synchronous PWM converter that integrates a low-resistance, high-side MOSFET and

5、 a Customer Chosen, External Diode for the rectification. The LV5980MC utilizes externally compensated current mode control to provide good transient response, ease of implementation, and excellent loop stability. It regulates input voltages from 4.5 V to 23 V down to an output voltage as low as 1.235 V and is able to supply up to 3.0 A of load current. The LV5980MC includes Power Save Feature to enhance efficiency during Light Load. In low consumption mode, the device show operating current of 63 uA from VIN by shutting down unnecessary circuits.LV5980MC方案主要参数表LV5980MC方案原理图：图2. LV5980MC方案原理