A Small Areal Dual-Output Switched Capacitor DC-DC Converter with a Improved Range of Input Voltage

Abstract

In this paper, a small areal dual-output SC(switched capacitor) DC-DC converter with a improved range of an input voltage is presented. The conventional SC DC-DC converter has an advantage of low cost and small chip area. But, it has a narrow input voltage range to convert efficiently. Also, it has a lager chip area and a lower power efficiency from multiple outputs. The proposed SC DC-DC converter improves the power efficiency by using the capacitor array structure which efficiently converts the voltage according to the input voltage. By sharing two switch array, it reduces the number of switches and capacitors from 32 to 25. The proposed SC DC-DC converter was manufactured in a 0.18µm CMOS process. In the simulation, the range of the input voltage is 0.7~ 1.8V, the max. power efficiency is 90%, and the chip area is 0.255mm 2 .