A Fully Integrated Battery-Connected Switched-Capacitor 4:1 Voltage Regulator with 70% Peak Efficiency Using Bottom-Plate Charge Recycling
Publication information:
Tao Tong, Xuan Zhang, Wonyoung Kim, David Brooks, and Gu Wei. 2013. “A Fully Integrated Battery-Connected Switched-Capacitor 4:1 Voltage Regulator With 70% Peak Efficiency Using Bottom-Plate Charge Recycling”. In IEEE Custom Integrated Circuits Conference (CICC)
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.