Design and Characterization of Package-Embedded Solenoidal Magnetic Core Inductors for High-Frequency and High-Efficiency SIP Integrated Voltage Regulators
| Autor: | Madhavan Swaminathan, Mohamed Lamine Faycal Bellaredj, Paul A. Kohl |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science business.industry 020208 electrical & electronic engineering 02 engineering and technology Voltage regulator Inductor 01 natural sciences Industrial and Manufacturing Engineering Electronic Optical and Magnetic Materials Inductance Magnetic core Electromagnetic coil Magnet 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Ferrite (magnet) Equivalent circuit Optoelectronics Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Components, Packaging and Manufacturing Technology. 11:625-634 |
| ISSN: | 2156-3985 2156-3950 |
| Popis: | In this article, the design and characterization of package-embedded solenoid inductors for a high-efficiency, four-phase system-in-package (SIP) buck-type integrated voltage regulator (IVR) switching at 100 MHz is discussed. The IVR enables three conversion ratios (5, 3, and 1.7–1 V) with a minimum inductance of 25 nH/phase and a load current of 10 A (2.5 A/phase). Two inductor designs (one with a rectangular core made of an epoxy dielectric/NiZn ferrite composite magnetic material/epoxy dielectric stack and one with an elliptical core of NiZn ferrite composite magnetic material only) were optimized and compared based on the highest achievable IVR efficiency. At high-load conditions (>5 A), the elliptical core inductor showed higher efficiency than the rectangular core inductor over the frequency range investigated (10–100 MHz). The elliptical core inductors were fabricated using a novel fabrication process combining core printing, noncontact photolithography, and copper electroplating. Two simple deembedding techniques which use a single thru structure and its equivalent circuit model as well as a cascade-based two-port analysis were introduced for the characterizations of the fabricated inductors. The accuracy of these deemebedding techniques was assessed using commercial, fixed-air core inductors and standard THRU and thru–reflect–line (TRL) deembedding for comparison purpose. Less than 5% difference was observed between the TRL and the introduced deembedding techniques for the inductance and ac resistance for both the fixed air core and package-embedded magnetic core inductors. The extracted electrical parameters of the fabricated inductors were compared with the modeling results and a good correlation was observed at 100 MHz. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|