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A 470-nA Quiescent Current and 92.7%/94.7% Efficiency DCT/PWM Control Buck Converter With Seamless Mode Selection for IoT Application.

Authors :
Zeng, Wen-Liang
Ren, Yuan
Lam, Chi-Seng
Sin, Sai-Weng
Che, Weng-Keong
Ding, Ran
Martins, Rui Paulo
Source :
IEEE Transactions on Circuits & Systems. Part I: Regular Papers; Nov2020, Vol. 67 Issue 11, p4085-4098, 14p
Publication Year :
2020

Abstract

An ultra-low quiescent current dual-mode buck converter system is designed for IoT application, which includes a double clock time (DCT) and a pulse-width-modulation (PWM) control modes. The proposed DCT mode can reduce the conversion loss over a wide loading range from nA-to-mA and achieve seamless mode transition from DCT to PWM control. Implemented in a $0.18\mu \text{m}$ CMOS, this converter achieves a peak efficiency of 92.7%/94.7% in DCT/PWM and >80% efficiency from $10~\mu $ A to 50 mA (5000x), with a wide input voltage from 2 V to 5 V. A quiescent current of 470 nA including bandgap voltage reference and internal oscillator is achieved. The DCT-to-PWM mode selection mechanism achieves an undershoot of 80 mV at $11~\mu \text{s}$ recovery time when load current jumps from $6.67~\mu \text{A}$ to 50 mA. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
15498328
Volume :
67
Issue :
11
Database :
Complementary Index
Journal :
IEEE Transactions on Circuits & Systems. Part I: Regular Papers
Publication Type :
Periodical
Accession number :
146782414
Full Text :
https://doi.org/10.1109/TCSI.2020.3006200