一种超低压差高性能LDO设计  

A High Performance LDO Design With Ultra-Low Dropout Voltage

作　　者：徐晨涛 程旭 张霖 XU Chen-tao;CHENG Xu;ZHANG Lin(National Demonstration Center for Experimental Electronic Information and Electrical Technology Education,Fujian University of Technology)

机构地区：[1]福建理工大学电子信息与电气技术国家级实验教学示范中心

出　　处：《中国集成电路》2024年第4期39-46,共8页China lntegrated Circuit

摘　　要：基于0.35μm工艺,本文设计了一款为便携式电子设备供电的LDO线性稳压器,其输出电压控制为1.8V。该电路既可工作在轻载也可工作在重载状态下。本文对LDO线性稳压器的原理进行了简要分析,详细阐述了关键电路的工作原理,通过同时增加密勒补偿与片外电阻ESR的方式进行频率补偿,通过Cadence Spectre仿真验证了设计的可行性。低功耗模式下,静态电流可以低至45μA。在重载情况下,增益可达65dB以上,压差可在50 mV以下。Based on 0.35μm process,a Low Drop-out(LDO)voltage regulator is designed for portable electronics with the output voltage regulated at 1.8V.The designed circuit works under both of light-load and heavy-load conditions.The principle of LDO is briefly analyzed,and the working functions of key circuits are described in detail.The frequency compensation is realized by both adding the Miller compensation capacitor and increasing the off-chip capacitor’s equivalent serial resistance(ESR).The feasibility of the design is verified by Cadence Spectre simulation.In low power mode,static current can be as low as 45μA.Under heavy load condition,the gain can achieve more than 65 dB,and the drop-out voltage can go below 50 mV.

关 键 词：超低压差 高性能 密勒补偿 

分 类 号：TM44[电气工程—电器]