Techniques for a coaxial inductor in a glass core are disclosed. In an illustrative embodiment, an inductor is positioned in a cavity of a glass core. The inductor includes a conductive via extending through the glass core surrounded by a magnetic material. A buffer layer is positioned between the edges of the cavity of the glass core and the inductor. The buffer can prevent or mitigate any stress caused by changes in temperature and different coefficients of thermal expansion of the glass core and the inductor. The inductor may form part of a fully integrated voltage regulator (FIVR), which provides a stable voltage source to a semiconductor die such as a processor.

A power module comprises a first circuit board assembly and a magnetic core assembly. The first circuit board assembly comprises a first printed circuit board and at least two switch circuits disposed on the first printed circuit board. The magnetic core assembly is disposed near the first printed circuit board and comprises a magnetic core portion and at least a pair of first electrical conductors. The magnetic core portion comprises at least a core unit, the core unit comprises a pair of holes and a second magnetic overlapping region, and the pair of holes are separated by the second magnetic overlapping region. Each pair of the first electrical conductors is penetrated through the corresponding pair of holes of the magnetic core portion to define two output inductors. Each of the switch circuits is electrically connected with the corresponding output inductor to define a phase circuit of the power module.

Microelectronic assemblies, related devices and methods, are disclosed herein. In some embodiments, a microelectronic assembly may include a first die in a first dielectric layer; a magnetic core inductor, having a first surface and an opposing second surface, in the first dielectric layer, including a first conductive pillar, having a first end at the first surface of the magnetic core inductor and an opposing second end at the second surface, at least partially surrounded by a magnetic material that extends at least partially along a thickness of the first conductive pillar from the second end and tapers towards the first end; and a second conductive pillar coupled to the first conductive pillar; and a second die in a second dielectric layer on the first dielectric layer coupled to the second surface of the magnetic core inductor.

An apparatus includes a carrier substrate, a ferrite core, a first set of wire windings, a second set of wire windings, a third set of wire windings, and a fourth set of wire windings. The ferrite core is attached to the carrier substrate. The first set of wire windings, the second set of wire windings, the third set of wire windings, and the fourth set of wire windings pass through the ferrite core and between the ferrite core and the carrier substrate to which the ferrite core is attached.

The power module includes a power circuit, a magnetic assembly and a first circuit board. The power circuit includes at least one switch element. The magnetic assembly includes at least one first electrical conductor and a magnetic core module, wherein at least one first electrical conductor passes through the magnetic module, and a terminal of the at least one first electrical conductor is electrically connected to the at least one switch element. The first circuit board includes a first surface and a second surface opposite to the first surface, wherein the power circuit is disposed on the first surface. The power circuit and the magnetic assembly are arranged in sequence along a same direction. The power module further includes a plurality of second electrical conductors, wherein one end of each of the second electrical conductors is disposed on one edge of the second surface of the first circuit board and electrically connected with the power circuit.