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Self-Coupled Integrated Inductor in Multilayer Packages for a Low Frequency Power Supply in Package Applications

IP.com Disclosure Number: IPCOM000083154D
Publication Date: 2005-Mar-01
Document File: 3 page(s) / 157K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a self-coupled, stacked inductor in multilayer packages; stacking increases inductance without increasing the inductor form factor, and self-coupling the magnetic flux reduces possible radiation. Benefits include reducing process costs and increasing product reliability.

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Self-Coupled Integrated Inductor in Multilayer Packages for a Low Frequency Power Supply in Package Applications

Disclosed is a method for a self-coupled, stacked inductor in multilayer packages; stacking increases inductance without increasing the inductor form factor, and self-coupling the magnetic flux reduces possible radiation. Benefits include reducing process costs and increasing product reliability.

Background

Currently, there is a need to design package integrated inductors with a large inductance (i.e. in the uH range) and small series resistance, but in a small form factor to accommodate low frequency applications. The current state of the art is to mount discrete external inductors on packages, which increases process costs.

General Description

The disclosed method uses a self-coupled stacked inductor to achieve large inductance with small DC series resistance, within the limited space of smaller applications. Figure 1 shows a geometric example of the disclosed method. Figure 2 shows a comparison of the magnetic flux between the disclosed method and a current package inductor. In the disclosed method, the magnetic flux circulates within the inductor itself, thereby reducing interactions with other components.

Inductance is increased without requiring a larger package size by routing the inductor in more layers. Figures 3 and 4 show the stacked versus single layer inductors, and the dielectric thickness effect on the inductance. Figure 5 shows an example of the se...