Study on the electric performances of planar inductor with Fe-system magnetic flake composite integrated for SiP DC-to-DC converter applications

Electronic products such as phone handsets and table PC have been highly-miniaturized, and their functionality and performance have increased. In particular, high power density integrated passives accelerate industrial and consumer applications of one-chip DC-to-DC converters, since the converters which are closer to the load were required in order to minimize efficiency losses and reduce the effects of interconnect parasitics. Herein, this paper reports the electric performances of a planar toroidal inductor with Fe-system magnetic flake composites integrated to a test SiP converter. The proposed inductor with the magnetic flake composite offers 1-10 W solution in the frequency range between 1-10 MHz and can be thinner than bulky ferrite inductors while thicker than sputter-deposited thin film inductors because of thick film composite structure of an amorphous Fe-B-Si-C magnetic flakes with high saturation magnetization (1.64 Tesla).