A fully integrated battery-connected switched-capacitor 4:1 voltage regulator with 70% peak efficiency using bottom-plate charge recycling

Author

Tao Tong ; Xuan Zhang ; Wonyoung Kim ; Brooks, David ; Gu-Yeon Wei

Author_Institution

Sch. of Eng. & Appl. Sci., Harvard Univ., Cambridge, MA, USA

fYear

2013

fDate

22-25 Sept. 2013

Firstpage

1

Lastpage

4

Abstract

This work presents a switched-capacitor (SC) DC-DC voltage regulator that converts a 3.7V battery voltage down to ~0.8V in order to power the `brain´ SoC of a flapping-wing microrobotic bee. A cascade of two 2:1 SC converters offers high efficiency for a 4:1 conversion ratio. A charge recycling technique reduces the flying capacitor´s bottom-plate parasitic loss by 50% and overall conversion efficiency reaches 70%. The output droop is less than 10% of the nominal output voltage for a worst-case 47mA load step.

Keywords

DC-DC power convertors; microrobots; recycling; switched capacitor networks; system-on-chip; voltage regulators; DC-DC voltage regulator; SC converters; battery voltage; bottom-plate charge recycling; bottom-plate parasitic loss; brain SoC; current 47 mA; flapping-wing microrobotic bee; flying capacitor; integrated battery-connected switched-capacitor; voltage 3.7 V; Capacitors; Power generation; Recycling; Switches; Switching frequency; Voltage control; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference (CICC), 2013 IEEE

Conference_Location

San Jose, CA

Type

conf

DOI

10.1109/CICC.2013.6658485

Filename

6658485