An efficiency enhance mixed-structure charge pump

Author

Hsieh, Zong-Han ; Huang, Nan-Xiong ; Shiau, Miin-Shyue ; Wu, Hong-Chong ; Liu, Don-Gey

Author_Institution

Grad. Inst. of Electron. Eng., Feng Chia Univ., Taichung, Taiwan

fYear

2009

fDate

14-16 Dec. 2009

Firstpage

566

Lastpage

569

Abstract

An enhanced high-efficiency switching-capacitor DC-DC voltage converter based on the combination of charge transfer switch (CTS) charge pump and cross-coupled output stage is presented. Some motivated methods to overcome the reverse charge sharing problem of traditional CTS charge pump are discussed and a new mixed structure is proposed to conquer the remaining problem of threshold drop at the output stage. The charge pump proposed can operate at 1 MHz switching-frequency on the 0.1 Â¿F pump-capacitors. After the simulation by using HSPICE 0.35 Â¿m TSMC process, our work can convert the input low DC-voltage (V_DD=1.5V) up near to 5 times of it (V_OUT= 7.4483V) and the pump-efficiency reaches to 99.31%. The new proposed charge pump circuit is suitable for low-voltage applications in CMOS process because there is no threshold voltage drop in every stage even at the output stage. A great achievement has been obtained.

Keywords

CMOS integrated circuits; DC-DC power convertors; SPICE; charge pump circuits; charge-coupled devices; low-power electronics; DC-DC voltage converter; HSPICE; TSMC; charge transfer switch; frequency 1 MHz; mixed-structure charge pump; pump efficiency; switching-capacitor; Capacitance; Capacitors; Charge pumps; Circuits; DC-DC power converters; Feedback; Switches; Switching converters; Threshold voltage; Voltage-controlled oscillators; charge pump; dc-dc converter; high-efficiency; low-voltage; threshold voltage drop;

fLanguage

English

Publisher

ieee

Conference_Titel

Integrated Circuits, ISIC '09. Proceedings of the 2009 12th International Symposium on

Conference_Location

Singapore

Print_ISBN

978-9-8108-2468-6

Type

conf

Filename

5403908