一种应用于LDO的宽范围稳压电路  

A wide range voltage stabilizing circuit for LDO regulator

作　　者：周志兴 来强涛[1] 郭桂良[1] 姜宇[1] 郭江飞[1] 王成龙 Zhou Zhixing;Lai Qiangtao;Guo Guiliang;Jiang Yu;Guo Jiangfei;Wang Chenglong(Institute of Microelectronics,Chinese Academy of Sciences,Beijing 100029,China;School of Electronics,University of Chinese Academy of Sciences,Beijing 100049,China;School of Microelectronics,University of Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]中国科学院微电子研究所,北京100029 [2]中国科学院大学电子学院,北京100049 [3]中国科学院大学微电子学院,北京100029

出　　处：《电子技术应用》2019年第3期28-31,共4页Application of Electronic Technique

基　　金：国家重点研发计划(2017YFB0503200)

摘　　要：在LDO的设计中,为了提高输入电源电压上限,一般采用大尺寸的晶体管,但这样会增加电路的面积。为了解决这个问题,采用改进的威尔逊电流镜结构设计了一种宽范围稳压电路,为LDO各个子模块提供电源和偏置。仿真结果表明,稳压电路可以将3.5 V～6 V外部供电电源电压转换为1.8 V内部电压,使得LDO核心电路在高输入电源电压下依然可以使用0.18μm的MOS管,降低了芯片面积,并且可以给LDO模拟模块的设计带来便利。Large size and thick oxide transistors are usually used in the design of Low Dropout Linear Regulator(LDO)in order to increase the upper limited voltage of input supply voltage,but this will increase the area of the circuit.In order to solve this problem,this paper proposed a wide range voltage stabilizing circuit based on an improved Wilson current mirror structure,which provides power and bias for LDO.The simulation results show that the external supply voltage range from 3.5 V to 6 V can be converted to 1.8 V supply voltage,so that the LDO core circuit can still use 0.18μm MOS transistors under the high input supply voltage,which can reduce the chip area.And it can bring convenience to the design of LDO analog module.

关 键 词：LDO 线性稳压器 宽范围稳压电路 

分 类 号：TM44[电气工程—电器]