UM
A SAR-ADC-Assisted DC-DC Buck Converter with Fast Transient Recovery
Zeng,Wen Liang1,3; Bonizzoni,Edoardo2; Wu,Chi Wa1,3; Lam,Chi Seng1,3; Sin,Sai Weng1,3; Chio,U. Fat1,3; Maloberti,Franco2; Martins,Rui Paulo1,3,4
2020-09-01
Source PublicationIEEE Transactions on Circuits and Systems II: Express Briefs
ISSN1549-7747
Volume67Issue:9Pages:1669-1673
AbstractThis brief presents a successive-approximation-register (SAR) analog-to-digital converter (ADC) assisted DC-DC buck converter, which operates in discontinuous conduction mode (DCM) and achieves fast load transient recovery characteristics. The power inductor of the buck converter uses the bond-wire inductance. During the load transient, the dynamic low-power SAR ADC samples the converter's undershoot/overshoot output voltage and controls the programmable current pump circuit to charge/discharge the output capacitor, thus speeding up and smoothing the load transient response. An additional compensation circuit is also designed to ensure the stability of the voltage mode control loop and the current pump. The chip fabricated in a 65-nm CMOS technology occupies an area of 1 mm2. The converter, switching at 100 MHz, achieves a peak power efficiency of 81% when $V_{IN}= 1.2$ V, $V_{OUT} = 1$ V and $I_{Load} = 50$ mA. When the load current steps from 2 mA to 50 mA, the measured undershoot/overshoot voltage is 101/92 mV, and the recovery time is 175/406 ns.
KeywordADC additional loop compensation bond-wire inductor buck converter current pump DCM fast transient recovery
DOI10.1109/TCSII.2020.3006274
URLView the original
Language英语
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Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.State Key Laboratory of Analog,Mixed-Signal VLSI,University of Macau,Macao
2.Department of Electrical Computer and Biomedical Engineering,University of Pavia,Pavia,Italy
3.Department of Electrical and Computer Engineering,Faculty of Science and Technology,University of Macau,Macao
4.Instituto Superior Tecnico,Universidade de Lisboa,Lisbon,1049-001,Portugal
First Author AffilicationUniversity of Macau;  Faculty of Science and Technology
Recommended Citation
GB/T 7714
Zeng,Wen Liang,Bonizzoni,Edoardo,Wu,Chi Wa,et al. A SAR-ADC-Assisted DC-DC Buck Converter with Fast Transient Recovery[J]. IEEE Transactions on Circuits and Systems II: Express Briefs,2020,67(9):1669-1673.
APA Zeng,Wen Liang,Bonizzoni,Edoardo,Wu,Chi Wa,Lam,Chi Seng,Sin,Sai Weng,Chio,U. Fat,Maloberti,Franco,&Martins,Rui Paulo.(2020).A SAR-ADC-Assisted DC-DC Buck Converter with Fast Transient Recovery.IEEE Transactions on Circuits and Systems II: Express Briefs,67(9),1669-1673.
MLA Zeng,Wen Liang,et al."A SAR-ADC-Assisted DC-DC Buck Converter with Fast Transient Recovery".IEEE Transactions on Circuits and Systems II: Express Briefs 67.9(2020):1669-1673.
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