A Wide-Load-Range Mixed-Mode LDO Regulator with Single-Transistor-Assisted Buffer

Zhang, Ning; Zhan, Chenchang; Li, Han; He, Linjun

10.1109/NEWCAS.2018.8585690

2018

2472-467X

978-1-5386-4860-5

2018 16TH IEEE INTERNATIONAL NEW CIRCUITS AND SYSTEMS CONFERENCE (NEWCAS)

162-165

24-27 June 2018

Montreal, QC, Canada

345 E 47TH ST, NEW YORK, NY 10017 USA

IEEE

A wide-load-range low-dropout (LDO) regulator with single-transistor-assisted buffer and analog-digital mixed mode control is presented in this paper. The single-transistor assisted PMOS-input unity-gain-buffer can extend the gate voltage range of the analog power transistor and guarantee that the proposed LDO regulator can work well even at very light load current. To extend the loading capability for large load current, a mixed-mode control is used to detect heavy load and turn on or off the digital power transistor which provides large current to the load with better area efficiency. With the digital assistance, the proposed LDO regulator has better load regulation and loading capability at heavy load as well. A proof of-concept design of the proposed LDO regulator has been implemented and fabricated in a standard 0.18-mu m CMOS process. It occupies an active area of only 0.01 mm(2). With the load current step from 0 mA to 150 mA, the proposed LDO regulator with digital assistance achieves a droop voltage reduction of more than 50% compared to the design without the digital assistance. A load regulation of 0.21 10/mA is achieved by the proposed design with the help of the digital assistance and single-transistor-assisted buffer.

Low-dropout (LDO) regulator digital assistance single-transistor-assisted buffer load regulation mixed-mode

第一 ; 通讯

英语

CPCI-S ; EI

Shenzhen Science and Technology Innovation Committee (SZSTI)[JCYJ20160530191008447]

Engineering

Engineering, Electrical & Electronic

WOS:000458806300038

20190606462993

Buffer amplifiers ; Electric current regulators ; Power transistors

Amplifiers:713.1 ; Control Equipment:732.1

Web of Science

Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen, Peoples R China

Zhang, Ning,Zhan, Chenchang,Li, Han,et al. A Wide-Load-Range Mixed-Mode LDO Regulator with Single-Transistor-Assisted Buffer[C]. 345 E 47TH ST, NEW YORK, NY 10017 USA:IEEE,2018:162-165.