A reconfigurable 2× / 2.5× / 3× / 4× SC DC-DC regulator for enhancing area and power efficiencies in transcutaneous power transmission

Author

Zhang, Xiwen ; Lee, Hoi

Author_Institution

Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA

fYear

2011

fDate

19-21 Sept. 2011

Firstpage

1

Lastpage

4

Abstract

A reconfigurable 2× / 2.5× / 3× / 4× switched-capacitor DC-DC regulator for transcutaneous power transmission is presented in this paper. The proposed power stage enables the regulator to maintain high power efficiencies under different input voltages caused by coupling variations. A fixed on-time regulation scheme is developed to minimize the switching power loss and to achieve small output ripple voltages of the regulator. Implemented in a standard 0.35-μm n-well CMOS process, the proposed regulator delivers a maximum output current of 10 mA and achieves the peak power efficiency of 82%. When the input voltage varies by 1.6 V, the power efficiency of the proposed regulator can be improved by 40% compared to that of the fixed-ratio 4× counterpart. The output ripple reaches 0.5% of the output voltage.

Keywords

CMOS integrated circuits; DC power transmission; CMOS process; fixed on-time regulation; power efficiencies; reconfigurable SC DC-DC regulator; reconfigurable switched-capacitor DC-DC regulator; switching power loss; transcutaneous power transmission; Capacitors; Logic gates; Power transistors; Power transmission; Regulators; Voltage control; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference (CICC), 2011 IEEE

Conference_Location

San Jose, CA

ISSN

0886-5930

Print_ISBN

978-1-4577-0222-8

Type

conf

DOI

10.1109/CICC.2011.6055340

Filename

6055340