Integrated Circuit Inductor with Offset Metallic Lead Windings
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Solution Overview
Problem
Conventional switching power integrated circuits face challenges in integrating inductors due to difficulties in incorporating magnetic devices, leading to compromised performance, size, and manufacturing complexity, with discrete inductors prone to electrical shorting and electromagnetic interference.
Innovation Solution
An integrated circuit design that includes a semiconductor die, a magnetic core, and a metallic lead frame, where the lead frame serves as both a magnetic device winding and an electrical interface, encapsulated in packaging material to form a compact and efficient inductor within the integrated circuit package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If a small magnetic core is used to achieve a desired package size, then the integrated circuit package size is reduced, but the inductor cannot achieve a sufficiently large inductance value and is prone to magnetic saturation at high current levels
Solution Approach 1:
The patent embeds the magnetic core within the integrated circuit package, nesting it among other components. The core is positioned to utilize the three-dimensional space efficiently, allowing a larger core volume than traditional surface-mount inductors while maintaining a compact overall package footprint.
Solution Approach 2:
The patent transitions from two-dimensional planar inductor designs to three-dimensional volumetric magnetic core structures. By utilizing vertical space and multi-layer configurations, the design achieves larger inductance values without proportionally increasing the package footprint, effectively adding a dimensional aspect to the inductor geometry.
2Reliability
If discrete inductor components are used, then the inductor can be separately optimized, but the number of discrete components increases, impedance increases, and signaling delays occur
Solution Approach 1:
The patent merges the inductor with the integrated circuit by fabricating the magnetic core and winding structures as integral parts of the IC package. The inductor windings are formed using the same semiconductor manufacturing processes as the circuit elements, and the magnetic core is embedded within the package cavity, creating a unified hybrid device that eliminates separate discrete inductor components.
Solution Approach 2:
The integrated circuit package serves multiple functions simultaneously: it houses the semiconductor die, provides electrical interconnections, and contains the magnetic core for inductance. The packaging material and structural elements are designed to fulfill both mechanical protection and magnetic circuit functions, reducing the need for additional discrete components.
3Ease of manufacture
If conventional integrated circuit technology is used, then manufacturing is simplified, but magnetic devices cannot be incorporated into the integrated circuit
Solution Approach 1:
The patent employs composite material structures combining ferromagnetic materials with conventional semiconductor materials. The magnetic core is constructed from ferrite or other magnetic powders sintered into desired geometries, which are then integrated with silicon-based circuit elements. This composite approach allows magnetic functionality to be incorporated while maintaining compatibility with standard semiconductor manufacturing processes.
Solution Approach 2:
The patent utilizes changes in material parameters and fabrication conditions to enable magnetic device integration. By controlling the magnetic properties of the core material (permeability, saturation flux density) and adjusting fabrication parameters such as sintering temperature and winding geometry, the design achieves functional magnetic components that can be manufactured using modified but still conventional semiconductor processing techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables the integration of a compact and efficient inductor within the integrated circuit, reducing impedance, minimizing electromagnetic interference, and enhancing reliability, while allowing for larger magnetic core usage, thus improving inductance value and reducing core losses.
Implementation Method 1
The metallic lead forms a first winding turn around a portion of the magnetic core... The first and second winding turns are offset from each other along both of the width and length of the magnetic core
Data Source
AI summary
An integrated circuit includes a semiconductor die including one or more switching circuits, a magnetic core having length and width, first and second metallic leads, and integrated circuit packaging material. The first metallic lead forms a first winding turn around a portion of the magnetic core, and the first metallic lead is electrically coupled to the semiconductor die. The second metallic lead forms a second winding turn around a portion of the magnetic core. The first and second winding turns are offset from each other along both of the width and length of the magnetic core. The integrated circuit is, for example, included in an integrated electronic assembly.