超低静态电流LDO的电路设计  

Circuit Design of LDO with Ultra-Low Quiescent Current

作　　者：夏晓娟[1,2] 郝梦良 丁玉婷 XIA Xiaojuan;HAO Mengliang;DING Yuting(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing University of Posts and Telecommunications,Nanjing Jiangsu 210023,China;National and Local Joint Engineering Laboratory for RF Integration and Micro-Assembly Technology,Nanjing University of Posts and Telecommunications,Nanjing Jiangsu 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院微电子学院,江苏南京210023 [2]南京邮电大学射频集成与微组装技术国家地方联合工程实验室,江苏南京210023

出　　处：《电子器件》2021年第4期830-836,共7页Chinese Journal of Electron Devices

基　　金：航空科学基金项目(20182412009)。

摘　　要：基于电流自适应技术增强瞬态响应的特性,设计了一种超低静态电流的低压差线性稳压器(LDO)电路。通过优化提出一种自适应电流跃变电路,可实现在空载条件下的静态电流低至380 nA,与传统的电流自适应电路相比,改善了电路在轻负载时的瞬态响应。采用动态电流的缓冲器增强电路的瞬态响应,同时动态电流缓冲器形成了极点-极点追踪补偿的效果,并结合零点-极点追踪补偿技术保证电路稳定。采用CSMC 0.5μm工艺,通过Cadence工具仿真验证,结果表明,所提出的LDO电路在输入2.5 V~5.0 V范围内,可稳定输出1.8 V,最大可驱动300 mA负载。在带载50 mA内变化时过冲电压小于60 mV。Based on the current adaptive technology to enhance the characteristics of transient response,a low-dropout linear regulator(LDO)circuit with ultra-low quiescent current is proposed.Through optimization,an adaptive current jump circuit is proposed,which can achieve a quiescent current as low as 380 nA under no-load conditions.Compared with the traditional current adaptive circuit,the transient response of the circuit at light load is improved.The transient response of the circuit is enhanced by adopting a dynamic current buffer,while the dynamic current buffer forms the effect of pole-pole tracking compensation,and combined with a zero-pole tracking compensation technology to ensure circuit stability.Based on the CSMC 0.5μm process,the proposed LDO circuit is simulated with Cadence tools.The results show that the proposed LDO circuit can stably output 1.8 V within the input range of 2.5 V~5.0 V,the maximum load current reached to 300 mA.The overshoot voltage is less than 60 mV when the light load changes within 50 mA.

关 键 词：低静态电流 低压差线性稳压器 低功耗 电流自适应技术 

分 类 号：TN710[电子电信—电路与系统]