湖南大学学报（自然科学版）2025，Vol.52Issue(12)：137-146,10.DOI:10.16339/j.cnki.hdxbzkb.2025233
一种基于负载检测技术的高稳定性瞬态增强LDO
A High Stability Transient Enhanced LDO Based on Load Detection Technology
摘要
Abstract
To improve the transient characteristics of the output-capacitor less low-dropout linear regulator(LDO),a load detection circuit and overshoot/undershoot suppression circuits are designed and optimized to realize a output-capacitor less LDO with low power consumption and high transient characteristics.By utilizing the high-proportion current mirror to sample and follow the change of the LDO load current,the load detection circuit can adaptively change the tail current of the error amplifier to improve the system's bandwidth and slew rate,thereby enhancing the transient response speed of the LDO.When overshoot occurs in the output voltage,the overshoot suppression circuit utilizes the high-pass network to detect the change of the gate voltage of the power transistor,enabling a discharge path for the load current to reduce its change in the output stage,so as to suppress the overshoot.When the output voltage undershoot occurs,the undershoot suppression circuit can rapidly increase the output current of the power transistor by opening the discharge path for the gate-drive current of the power transistor,and then effectively suppress the undershoot.Based on 0.5 μm CMOS process,the circuit is designed and tested.The results show that the input voltage of the LDO is 2～5.5 V,and the output voltage is 1.2 V;the maximum load current is 150 mA,with the linear regulation of 1.7×10-3;when there is no load,the quiescent current is less than 6.16 μA;when the load current varies in 1～150 mA@1 μs,both the undershoot and overshoot voltages are less than 300 mV.The LDO has the advantages of low power consumption and high transient characteristics,which can meet the application needs of portable electronic devices.关键词
低压差线性稳压器/低功耗电子/瞬态分析/负载检测技术/过冲/欠冲抑制Key words
low-dropout linear regulator/low power consumption electronics/transient analysis/load detection technology/overshoot/undershoot suppression分类
信息技术与安全科学引用本文复制引用
谢海情,赵欣领,曾健平,王昌志,巩雅楠,丁宇航,谌运政,刘顺城,梁文萱..一种基于负载检测技术的高稳定性瞬态增强LDO[J].湖南大学学报（自然科学版）,2025,52(12):137-146,10.基金项目
湖南省自然科学基金资助项目(2024JJ7610),Natural Science Foundation of Hunan Province(2024JJ7610) （2024JJ7610）
湖南省教育厅科学研究项目(24A0227),Scientific Research Fund of Hunan Provincial Education Department(24A0227) （24A0227）
长沙理工大学实践创新与创业能力提升计划项目(CLSJCX23111),Practical Innovation and Entrepreneurship Enhancement Program of Changsha University of Science&Technology(CLSJCX23111) （CLSJCX23111）
长沙理工大学研究生科研创新项目(CSLGCX23111),Postgraduate Scientific Research Innovation Project of Changsha University of Science&Technology(CSLGCX23111) （CSLGCX23111）
国家级大学生创新创业训练计划项目(202210536038),National Undergraduate Training Program for Innovation and Entrepreneurship(202210536038) （202210536038）
