Integration of a Monolithic Buck Converter Power IC and Bondwire Inductors With Ferrite Epoxy Glob Cores

Jia, Hongjie; Lu, Jian; Wang, Xuexin; Padmanabhan, Karthik; Shen, Z. John

doi:10.1109/tpel.2010.2100829

Cited by 40 publications

(16 citation statements)

References 13 publications

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“…From figure 8, it is clear that the PCB inductors using laminated thin film cores provides reasonably high inductance densities for moderate DCR resistance. This performance can be further improved by using more advanced PCB copper technology and wider diameter bondwires as used in previous work [3,11,12].…”

Section: Assembly and Characterization Of Pcb Thin Film Inductorsmentioning

confidence: 98%

“…Further to improve reliability and performance, the wirebond can be replaced by Cu clips which provide more consistent results in comparison to wire bonds. A number of publications have been reported on bond wire inductors with magnetic epoxy as core material [3,10,11,12]. However, use of magnetic powder based epoxy as core material does not provide the required miniaturization in terms of device size, due to the lower saturation flux density of the epoxy material.…”

Section: Introductionmentioning

confidence: 99%

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PCB Embedded Bondwire Inductors With Discrete Thin-Film Magnetic Core for Power Supply in Package

Kulkarni

Jordan

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

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Section: Assembly and Characterization Of Pcb Thin Film Inductorsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

PCB Embedded Bondwire Inductors With Discrete Thin-Film Magnetic Core for Power Supply in Package

Kulkarni

Jordan

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

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“…Magnetic materials, e.g., metal alloy [7], [8], ferrites [9], [10], magnetic powders [11], [12], and silicon steels [13] are widely used and researched as electrical energy storage/transfer elements in switched energy conversion. Table I ferrites are commonly used for high-frequency power electronic applications due to their inherent low electrical conductivity, resulting in negligible eddy-current loss at high frequency (>1 MHz).…”

Section: Magnetic Core Materials Considerationmentioning

confidence: 99%

Nanolaminated Permalloy Core for High-Flux, High-Frequency Ultracompact Power Conversion

Kim

Galle³

et al. 2013

IEEE Trans. Power Electron.

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Metallic magnetic materials have desirable magnetic properties, including high permeability, and high saturation flux density, when compared with their ferrite counterparts. However, eddy-current losses preclude their use in many switching converter applications, due to the challenge of simultaneously achieving sufficiently thin laminations such that eddy currents are suppressed (e.g., 500 nm-1 μm for megahertz frequencies), while simultaneously achieving overall core thicknesses such that substantial power can be handled. A CMOS-compatible fabrication process based on robot-assisted sequential electrodeposition followed by selective chemical etching has been developed for the realization of a core of substantial overall thickness (tens to hundreds of micrometers) comprised of multiple, stacked permalloy (Ni 80 Fe 20 ) nanolaminations. Tests of toroidal inductors with nanolaminated cores showed negligible eddy-current loss relative to total core loss even at a peak flux density of 0.5 T in the megahertz frequency range. To illustrate the use of these cores, a buck power converter topology is implemented with switching frequencies of 1-2 MHz. Power conversion efficiency greater than 85% with peak operating flux density of 0.3-0.5 T in the core and converter output power level exceeding 5 W was achieved.Index Terms-Eddy-current loss suppression, high-flux and high-frequency (HFHF) operation, laminated magnetic alloy.

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“…In order to increase the inductance density, increase the saturation current and reduce the core loss of a power inductor, magnetic materials with larger permeability, higher saturation magnetization, larger resistivity and smaller coercivity (such as ferrite materials) are desired [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…This supports the size reduction of power converters through power inductor miniaturization. For this purpose, different methods, such as the utilization of new magnetic materials as power inductor cores and designing new power inductor structures, have been proposed in the literature [12][13][14][15][16][17]. One of the methods used to increase the saturation current (or effectively reduce the size and weight) of the power inductor utilizes one or more permanent magnet(s) (PM) to partially cancel the magnetic fluxes generated by the power inductor winding [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of High-Current Toroid Power Inductor With NdFeB Magnet for DC–DC Power Converters

Dang

Qahouq

2015

IEEE Trans. Ind. Electron.

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This paper presents an experimental evaluation of a high current toroid power inductor (TPI) with NdFeB permanent magnet (PMTPI). By adding a small piece of fabricated NdFeB-N35EH magnet (magnet volume is ~0.36% of the PMTPI ferrite core volume) in the air gap of the TPI, the saturation current of the PMTPI is doubled with the same size and inductance value. The desired dimensions of the NdFeB-N35EH PM are calculated before fabrication and then the fabricated PM is characterized. The ~6.8 μH PMTPI is tested in a 5V to 2V buck power converter. Results show that compared to a TPI with the same size and inductance (~6.8μH) without the PM, the saturation current of the PMTPI is doubled (from 7A to 14A). Compared to another TPI with a larger size needed to double the saturation current, the ferrite core weight of the PMTPI is reduced to 53.6% and the core volume is reduced to 59.2%. Experimental results also show that the addition of the NdFeB-N35EH PM does not introduce additional power losses and increase of temperature for the PMTPI and does not affect the power converter efficiency.

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Integration of a Monolithic Buck Converter Power IC and Bondwire Inductors With Ferrite Epoxy Glob Cores

Cited by 40 publications

References 13 publications

PCB Embedded Bondwire Inductors With Discrete Thin-Film Magnetic Core for Power Supply in Package

PCB Embedded Bondwire Inductors With Discrete Thin-Film Magnetic Core for Power Supply in Package

Nanolaminated Permalloy Core for High-Flux, High-Frequency Ultracompact Power Conversion

Evaluation of High-Current Toroid Power Inductor With NdFeB Magnet for DC–DC Power Converters

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