一种集成于BUCK芯片的5V低压差线性稳压器  

5V Low Dropout Regulator Integrated in Buck System

作　　者：屈柯柯 祝乃儒 张海波 QU Keke;ZHU Nairu;ZHANG Haibo(China Key System&Integrated Circuit Co.,Ltd.,Wuxi 214072,China)

机构地区：[1]中科芯集成电路有限公司,江苏无锡214072

出　　处：《电子与封装》2021年第7期38-41,共4页Electronics & Packaging

摘　　要：基于BCD工艺设计了一种12 V输入5 V输出的带有片外电容的低压差线性稳压器(Low Dropout Regulator,LDO)电路,该电路主要应用于降压拓扑(BUCK)系统中,给内部模拟电路供电。该LDO使用N型场效应晶体管(NMOS)做输出管,使用密勒补偿,同时还带有温度系数调整功能。使用仿真软件进行仿真验证,仿真结果表明在100 mA负载条件下,电路具有87°的相位裕度,温度系数为2×10^(-6)/℃左右。Low dropout regulator(LDO)of 12 V input voltage and 5 V output voltage with external capacitor was designed based on bipolar CMOS DMOS(BCD)process.The circuit was mainly used in Buck to pology system to supply power to internal analog circuit.Depletion NMOS was used to compensate output voltage temperature coefficient.In addition,'Ahuja'frequency compensation was applied to obtain enough phase margin.Hspice simulation result under typical corner were given.The temperature coefficient was 2×10^(-6)/℃.87°phase margin was got under the condition of 100 mA load current.

关 键 词：低压差线性稳压器 温度补偿 耗尽型NMOS 频率补偿 

分 类 号：TN402[电子电信—微电子学与固体电子学]