Integrated Voltage Regulator Efficiency Improvement using Coaxial Magnetic Composite Core Inductors

Bharath, K.; Radhakrishnan, Kaladhar; Hill, Michael J.; Chatterjee, P.K.; Hariri, Haifa; Venkataraman, Srikrishnan; Hương, Trương Thu; Wojewoda, Leigh; Srinivasan, Sriram

doi:10.1109/ectc32696.2021.00208

Cited by 22 publications

(9 citation statements)

References 13 publications

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“…On the other hand, as will be discussed in Sect. 3, some recent works with integrated magnetic core inductor are improving FoM [15], [16], [35], [39], [40], [43], [45], [50]. In Fig.…”

Section: Benchmarks Of High F Sw Buck Convertersmentioning

confidence: 99%

“…6 (c)). An adaptive phase control is mostly used together with a multiple phase control [2], [7], [9], [11], [12], [15], [18]- [21], [23], [25]- [27], [29], [30], [32], [33], [43]- [45], [49]- [51], [55], [60], where each phase is shifted by 360/N degree (N is the total number of phases). This scheme can basically reduce the ripple current by the factor of N, or it can even perfectly cancel out the ripple current at certain duty.…”

Section: Design Strategy and Basic Circuit Techniquesmentioning

confidence: 99%

“…There are two types of candidates for the core material. One is the thin magnetic film like permalloy (Fe 45 Fe 55 ) and CZT (CoTaZr) [27], [33], [35], [37], [39], [40], the other is epoxy/magnetic-filler composite [16], [43], [45], [50], [84], [85]. Some thin film processes are compatible with CMOS, so the magnetic core inductor can be integrated onchip.…”

Section: Technologies For Integrated Inductorsmentioning

confidence: 99%

“…For the integrated inductors, new magnetic filler materials that have smaller core loss to improve efficiency or higher permeability to increase inductance density are rapidly developing. For instance, carbonyl iron (CIP)/epoxy composite sheet shows very low eddy current loss even at 100MHz thanks to the very small grain diameter of 1.1μm [43], [45], [50], [84]. This is suitable for high-end CPU IVR and has been adopted to magnetic inductor array (MIA) [43] or coaxial metal inductor loop (Coax MIL) [45], [50] for 10 th generation Intel Core microprocessors and beyond.…”

Section: Prospective Viewsmentioning

confidence: 99%

“…For instance, carbonyl iron (CIP)/epoxy composite sheet shows very low eddy current loss even at 100MHz thanks to the very small grain diameter of 1.1μm [43], [45], [50], [84]. This is suitable for high-end CPU IVR and has been adopted to magnetic inductor array (MIA) [43] or coaxial metal inductor loop (Coax MIL) [45], [50] for 10 th generation Intel Core microprocessors and beyond.…”

Section: Prospective Viewsmentioning

confidence: 99%

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Design and Integration of Beyond-10MHz High Switching Frequency DC-DC Converter

Miyaji

2022

IEICE Trans. Electron.

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There are continuous and strong demands for the DC-DC converter to reduce the size of passive components and increase the system power density. Advances in CMOS processes and GaN FETs enabled the switching frequency of DC-DC converters to be beyond 10MHz. The advancements of 3-D integrated magnetics will further reduce the footprint. In this paper, the overview of beyond-10MHz DC-DC converters will be provided first, and our recent achievements are introduced focusing on 3Dintegration of Fe-based metal composite magnetic core inductor, and GaN FET control designs.

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“…On the other hand, as will be discussed in Sect. 3, some recent works with integrated magnetic core inductor are improving FoM [15], [16], [35], [39], [40], [43], [45], [50]. In Fig.…”

Section: Benchmarks Of High F Sw Buck Convertersmentioning

confidence: 99%

Section: Design Strategy and Basic Circuit Techniquesmentioning

confidence: 99%

Section: Technologies For Integrated Inductorsmentioning

confidence: 99%

Section: Prospective Viewsmentioning

confidence: 99%

Section: Prospective Viewsmentioning

confidence: 99%

See 3 more Smart Citations

Design and Integration of Beyond-10MHz High Switching Frequency DC-DC Converter

Miyaji

2022

IEICE Trans. Electron.

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PCB-embedded solenoid inductors with different magnetic cores

Zheng,

Liu,

Chen

et al. 2024

J. Power Electron.

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Vortex-based soft magnetic composite with ultrastable permeability up to gigahertz frequencies

Bai,

Sun,

Zhang

et al. 2024

Nat Commun

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Soft magnetic materials with stable permeability up to hundreds of megahertz (MHz) are urgently needed for integrated transformers and inductors, which are crucial in the more-than-Moore era. However, traditional frequency-stable soft magnetic ferrites suffer from low saturation magnetization and temperature instability, making them unsuitable for integrated circuits. Herein, we fabricate a frequency-stable soft magnetic composite featuring a magnetic vortex structure via cold-sintering, where ultrafine FeSiAl particles are magnetically isolated and covalently bonded by Al2SiO5/SiO2/Fe2(MoO4)3 multilayered heterostructure. This construction results in an ultrastable permeability of 13 up to 1 gigahertz (GHz), relatively large saturation magnetization of 105 Am2/kg and low coercivity of 48 A/m, which we ascribe to the elimination of domain walls associated with almost uniform single-vortex structures, as observed by Lorentz transmission electron microscopy and reconstructed by micromagnetic simulation. Moreover, the ultimate compressive strength has been simultaneously increased up to 337.1 MPa attributed to the epitaxially grown interfaces between particles. This study deepens our understanding on the characteristics of magnetic vortices and provides alternative concept for designing integrated magnetic devices.

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Integrated Voltage Regulator Efficiency Improvement using Coaxial Magnetic Composite Core Inductors

Cited by 22 publications

References 13 publications

Design and Integration of Beyond-10MHz High Switching Frequency DC-DC Converter

Design and Integration of Beyond-10MHz High Switching Frequency DC-DC Converter

PCB-embedded solenoid inductors with different magnetic cores

Vortex-based soft magnetic composite with ultrastable permeability up to gigahertz frequencies

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