An LDO/PFM dual-mode automatic switching method used in buck DC-DC converters

Author

Fei Xie ; Qi Wu ; Linghao Zhu ; Hao Min

Author_Institution

Sch. of Microelectron., Fudan Univ., Shanghai, China

fYear

2014

fDate

28-31 Oct. 2014

Firstpage

1

Lastpage

3

Abstract

A PFM (pulse frequency modulation)/LDO (low dropout regulator) dual-mode automatic switching method is proposed in this paper which can be used in buck DC-DC converters. This architecture provides better power conversion efficiency under ultra-light load. Also, it can help to achieve smaller voltage ripples. By using this method, a converter is designed and verified using the SMIC 0.13μm process. The supply voltage of this design is 2V and the output voltage range is from 1V to 1.8V. The simulation results show the converter can switch between the two modes automatically under different load cases. The maximum efficiency improvement of this design is 147.63% at 1mA compared to the PFM converters and the switching time is less than 37μs.

Keywords

DC-DC power convertors; switching; LDO-PFM dual mode automatic switching method; PFM; PFM converters; SMIC process; buck DC-DC converters; low dropout regulator; power conversion; pulse frequency modulation; size 13 mum; voltage 1 V to 1.8 V; voltage 2 V; voltage ripples; Abstracts; Circuit stability; Clocks; Detectors; Educational institutions; Indium tin oxide; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated Circuit Technology (ICSICT), 2014 12th IEEE International Conference on

Conference_Location

Guilin

Print_ISBN

978-1-4799-3296-2

Type

conf

DOI

10.1109/ICSICT.2014.7021583

Filename

7021583