A fast-transient-response fully-integrated digital LDO with adaptive current step size control
Cai,Guigang1,2; Zhan,Chenchang1; Lu,Yan2
Source PublicationProceedings - IEEE International Symposium on Circuits and Systems
AbstractA 0.6-V 100-mA fully-integrated digital low-dropout regulator (DLDO) with adaptive current step size control is presented in this paper. By dividing the main power PMOSs into ten blocks with different unit-cell sizes, the proposed DLDO can turn-on/-off small power PMOSs in light load and large ones in heavy load conditions. High regulation accuracy in a wide load range and fast transient response are hence achieved. In addition, an auxiliary power MOS block, which consists of both PMOS and NMOS transistors, is adopted to eliminate the limit cycle oscillation (LCO) in light load condition and to further accelerate the response speed. The proposed DLDO is fabricated in a 65-nm low-power CMOS technology with an active area of 0.17 mm including an on-chip output capacitor of 1nF. The measured undershoot and overshoot voltages are only 53 mV and 37 mV, respectively, when the load current changes between 0 and 100 mA. The quiescent current is 34.6 μA, while the maximum current efficiency is 99.96%.
KeywordAdaptive current step size control Digital low-dropout regulator (DLDO) Fast transient response Fully-integrated Wide load range
URLView the original
Scopus ID2-s2.0-85066795404
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Document TypeConference paper
CollectionUniversity of Macau
Affiliation1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,China
2.State Key Laboratory of Analog and Mixed-Signal VLSI,University of Macau,Macau,China
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Cai,Guigang,Zhan,Chenchang,Lu,Yan. A fast-transient-response fully-integrated digital LDO with adaptive current step size control[C],2019.
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