Patent ID: 7646610
Filing Date: 2010-01-12
Classification: H01F,H01L,H02M,H05K

Abstract:
1. A DC-DC converter comprising a soft-magnetic, multi-layer substrate provided with a laminated coil constituted by connecting pluralities of conductor lines, and a semiconductor integrated circuit device comprising a switching device and a control circuit, which are mounted on said soft-magnetic, multi-layer substrate, said semiconductor integrated circuit device comprising an input terminal, an output terminal, a first control terminal for controlling the ON/OFF of said switching device, a second control terminal for variably controlling output voltage, and pluralities of ground terminals; said soft-magnetic, multi-layer substrate comprising first external terminals formed on a first main surface, first connecting wires formed on the first main surface and/or on nearby layers, second connecting wires formed between the side surface of said multi-layer substrate and a periphery of said laminated coil, and second external terminals formed on a second main surface; and terminals of said semiconductor integrated circuit device being connected to said first external terminals on said multi-layer substrate, at least part of said first external terminals being electrically connected to said second external terminals through said first and second connecting wires, and said input or output terminal being connected to said second external terminals via said laminated coil.