A Fast-Transient Output Capacitor-Less Low-Dropout Regulator Using Active-Feedback and Current-Reuse Feedforward Compensationopen access
- Authors
- Sung, Eun-Taek; Park, Sangyong; Baek, Donghyun
- Issue Date
- Mar-2018
- Publisher
- MDPI
- Keywords
- power management integrated circuit; output capacitor-less LDO; frequency compensation; fast-transient response
- Citation
- ENERGIES, v.11, no.3
- Journal Title
- ENERGIES
- Volume
- 11
- Number
- 3
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/1171
- DOI
- 10.3390/en11030688
- ISSN
- 1996-1073
- Abstract
- In this paper, output capacitor-less low-dropout (LDO) regulator using active-feedback and current-reuse feedforward compensation (AFCFC) is presented. The open-loop transfer function was obtained using small-signal modeling. The stability of the proposed LDO was analyzed using pole-zero plots, and it was confirmed by simulations that the stability was ensured under the load current of 50 mA. The proposed compensation method increases gain-bandwidth product (GBW) and reduces the on-chip compensation capacitor. The proposed AFCFC technique was applied to a three-stage output capacitor-less LDO. The LDO has a GBW of 5.6 MHz with a small on-chip capacitor of 2.6 pF. Fast-transient time of 450 ns with low quiescent current of 65.8 mu A was achieved. The LDO was fabricated in 130 nm CMOS process consuming 180 x 140 mu m(2) of the silicon area.
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