一种高精度、快速瞬态响应的无片外电容低压差稳压器  

A High-precision Fast Transient Response Output-capless Low-dropout Regulator

作　　者：白创 李凯 BAI Chuang;LI Kai

机构地区：[1]长沙理工大学物理与电子科学学院,长沙410114

出　　处：《科技创新与应用》2024年第28期39-42,共4页Technology Innovation and Application

基　　金：湖南省大学生创新创业训练计划(S202310536160)。

摘　　要：该文基于0.18μm工艺设计一种无片外电容低压差稳压器(LDO),设计带推挽输出级的高摆率误差放大器提高输出电压精度和瞬态性能。此外,设计自适应偏置电路取样输出电流从而动态改变偏置电流,进一步提升LDO的瞬态性能。仿真结果表明,LDO压差为120 mV,在3.3~5.5 V的输入范围内输出电压为3 V,负载电流范围为0~20 mA。在不同负载电流下LDO相位裕度均达到60°以上,环路增益大于100dB。LDO线性调整率为100.68μV/V,负载调整率为11.21μV/mA。负载电流在1μs内于100μA~20mA间跳变时,过冲及建立时间分别为129 mV和1.4μs,下冲及建立时间为109 mV和1.02μs,满足高精度和快速瞬态响应的需求。In this paper,a output-Capless low-dropout regulator(LDO)is designed based on 0.18μm BCD process.The error amplifier with push-pull output stage improves the output Voltage accuracy and the transient performance.Additionally,an adaptive bias circuit is designed to sample the output current and change the bias current to improve the transient response of the LDO.The simulation results show that the dropout voltage of LDO is 120 mV.The input range is 3.3~5.5 V,and the output voltage is 3 V.The load current range is 0~20 mA.LDO phase margin and loop gain are more than 60°and 100 dB,respectively,under different load currents.The line regulation and load regulation are 100.68μV/V and 11.21μV/mA.When the load current skips between 100μA and 20 mA within 1μs,The overshoot and settling time are 129 mV and 1.4μs,respectively,the undershoot and settling time are 109 mV and 1.02μs.The performance can meet the requirements of high accuracy and fast transient response.

关 键 词：低压差稳压器 无片外电容 自适应偏置 高摆率 快速瞬态响应 

分 类 号：TN432[电子电信—微电子学与固体电子学]