A High-Efficiency and Fast-Transient Low-Dropout Regulator With Adaptive Pole Tracking Frequency Compensation Technique

被引：23

作者：

Ming, Xin ^{[1
]}

Liang, Hua ^{[1
]}

Zhang, Zhi-Wen ^{[1
]}

Xin, Yang-Li ^{[1
]}

Qin, Yao ^{[1
]}

Wang, Zhuo ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2020年 / 35卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Transconductance; Regulators; Transistors; Capacitors; Circuit stability; Transient analysis; Resistors; Adaptive pole tracking; low-dropout (LDO) regulator; low equivalent series resistance (ESR) capacitor; transconductance enhancement; HIGH PSR; VOLTAGE; SCHEME;

D O I：

10.1109/TPEL.2020.2984815

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An advanced smooth pole tracking technique for a low dropout (LDO) regulator with a ceramic capacitor is presented in this article. Normally, the dominant pole is at the output of an LDO and becomes load dependent, which may cause a loop stability issue during the whole load-current application range. The proposed frequency compensation methodology with adaptive load resistor control of an error amplifier (EA) alleviates the problem and reduces the dependence of equivalent series resistance of an output capacitor. Moreover, combined with this compensation strategy, an ultrafast EA by utilizing a transconductance enhancement technique is proposed to greatly reduce output voltage spikes as well as response time of the LDO during transient. This circuit has been implemented in a 0.18-mu m standard CMOS process and occupies an active chip area of 0.017 mm(2). Experimental results show that it can deliver 150 mA load current at 200 mV dropout voltage. Good loop stability and transient responses are easily achieved without degrading other important LDO parameters.

引用

页码：12401 / 12415

页数：15