A 20-MHz 1.8-W DC-DC Converter With Parallel Microinductors and Improved Light-Load Efficiency

The purpose of this paper is to show that distributing microinductors in parallel can reduce light-load losses, while also maintaining the same overall footprint area and the same effective inductance as a single microinductor. The performance of parallel microinductors is compared in a number of co...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2015-02, Vol.30 (2), p.771-779
Main Authors: Feeney, Ciaran, Ningning Wang, O Mathuna, Sean Cian, Duffy, Maeve
Format: Article
Language:English
Subjects:
Circuits
Conversion
Converters
DC-DC converters
Distributing
Electrical equipment
Energy efficiency
Footprints
Inductance
Inductors
inductors-on-silicon
light-load efficiency
Magnetic cores
Mathematical models
microfabricated
microinductor
MOSFET
PFM
Power supply
Prototypes
Resistance
Switches
thin-film inductors
Windings
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Summary:The purpose of this paper is to show that distributing microinductors in parallel can reduce light-load losses, while also maintaining the same overall footprint area and the same effective inductance as a single microinductor. The performance of parallel microinductors is compared in a number of configurations to demonstrate which configuration provides the best overall performance in terms of circuit size, conversion efficiency, and power handling. Light-load saving techniques are implemented demonstrating the potential of parallel inductors to improve efficiency at light-load. Measured and modeled results of efficiency versus load are presented for the prototype DC-DC converters explored, and a peak efficiency of 74% is predicted for a 1.8 W, 20-MHz DC-DC converter including microinductors.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2309393