An  Output Capacitor-less LDO with a Fast Transient Response Using Two Positive Feedback Loops

Ji Eun Park; Esun Baik; Sung Wan Hong

doi:10.23075/jicas.2022.8.4.003

Ji Eun Park Sookmyung Women's University
Esun Baik Sogang University https://orcid.org/0000-0002-9660-7805
Sung Wan Hong Sogang University https://orcid.org/0000-0003-1597-5727

DOI: https://doi.org/10.23075/jicas.2022.8.4.003

Keywords: Capacitor, Fast transient response, Low-dropout regulator(LDO)

Abstract

This paper proposes an output capacitor-less low-dropout regulator (LDO) with a fast-transient response. The proposed LDO can have fast transient response by using positive feedback loops which are implemented by the simple change from a conventional structure. In addition, the proposed LDO designs negative feedback loops with RC high pass filters which rapidly reflect output voltage variation to achieve the fast-transient response. The total compensation capacitance is 7.8 pF. The maximum load current supplied by the LDO is 100 mA and it consumes static current of 9 μA. The proposed LDO has been implemented in 0.18 μm CMOS technology and the active chip area is 0.0146 mm².

Author Biographies

Ji Eun Park, Sookmyung Women's University

Ji Eun Park received the M.S. degree in electronic engineering from Sookmyung Women’s University, Seoul, Korea, in 2020. Her main interests are a low-dropout regulator and DC-DC Converter.

Esun Baik, Sogang University

Esun Baik received the B.S. degree in electrical engineering from Sookmyung Women’s University, Seoul, Korea, in 2022. She is currently pursuing M.S. degree in Department of Electronic Engineering from Sogang University. Her main interests are a low-dropout regulator and Single-inductor Multiple-output Converter.

Sung Wan Hong, Sogang University

Sung Wan Hong received the B.S. degree in Electrical Engineering from the Korea University, Seoul, South Korea, in 2009, and the M.S. and Ph.D. degrees in Electrical Engineering from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 2011 and 2014, respectively.

In 2014, he joined Samsung Electronics Ltd., Suwon, South Korea. In 2017, he joined the Department of Electronics Engineering, Sookmyung Women’s University, Seoul, South Korea, as an Assistant Professor. Since 2021, he has been with the Department of Electronic Engineering, Sogang University, as an Associate Professor. His interests include the design of analog integrated circuits such as power management IC, high-speed buffer amplifier, wireless power transfer, energy harvesting, envelope modulator, and touch readout IC.

Homepage: https://icslab.sogang.ac.kr/icslab/4500.html