TITLE:
An Ultra-Low Quiescent Current CMOS Low-Dropout Regulator with Small Output Voltage Variations
AUTHORS:
Xin Cheng, Yizhong Yang, Longjie Du, Yang Chen, Guangjun Xie
KEYWORDS:
Ultra-Low Quiescent Current; Low-Dropout Regulator; Small Output Variations
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.2 No.4,
April
22,
2014
ABSTRACT: An ultra-low quiescent current low-dropout regulator with small output voltage variations and improved load regulation is presented in this paper. It makes use of dynamically-biased shunt feedback as the buffer stage and the LDO regulator can be stable for all load conditions. The proposed structure also employs a momentarily current-boosting circuit to reduce the output voltage to the normal value when output is switched from full load to no load. The whole circuit is designed in a 0.18 μm CMOS technology with a quiescent current of 550 nA. The maximum output voltage variation is less than 20 mV when used with 1 μF external capacitor.