Small size and fully integrated power converter with magnetics on chip

摘要

An integrated circuit has a semiconductor die provided in a first IC layer and an inductor fabricated on a second IC layer. The inductor may have a winding and a magnetic core, which are oriented to conduct magnetic flux in a direction parallel to a surface of a semiconductor die. The semiconductor die may have active circuit components fabricated in a first layer of the die, provided under the inductor layer. The integrated circuit may include a flux conductor provided on a side of the die opposite the first layer. PCB connections to active elements on the semiconductor die may progress through the inductor layer as necessary.

主权项

1. A microfabricated inductor with a magnetic core for an integrated circuit, comprising:
a semiconductor die; a multi-element magnetic core formed on a surface of the semiconductor die and comprising at least three magnetic core bars, there being a plurality of voids disposed between adjacent magnetic core bars of the at least three magnetic core bars; and a conductive winding coiled around the multi-element magnetic core such that the at least three magnetic core bars are all within a single loop of the conductive winding.