Patent ID: 9640445
Date: 2017-05-02
CPC Classifications: H01L,H02M

Claim:
1. A method of fabricating a switched-capacitor DC-to-DC converter, the method comprising: providing a semiconductor layer having a top surface and a bottom surface; forming a plurality of switching elements on the top surface of the semiconductor layer and in a bulk region of the semiconductor layer; forming a first insulation layer and first interconnection patterns over the top surface of the semiconductor layer; forming a second insulation layer over the first insulation layer and the first interconnection patterns; forming a second interconnection pattern connected to the first interconnection patterns and provided over the second insulation layer; forming a third insulation layer over the second insulation layer and the second interconnection pattern; forming third interconnection patterns and a lower interconnection pattern over the bottom surface of the semiconductor layer; forming a capacitor over the lower interconnection pattern; forming a fourth insulation layer over the bottom surface of the semiconductor layer to cover the third interconnection patterns and to expose an upper electrode pattern of the capacitor; forming a fifth insulation layer over the fourth insulation layer to cover the capacitor; and forming a plurality of pads in the fifth insulation layer, wherein the third interconnection patterns and the lower interconnection pattern are electrically connected to the first interconnection patterns.