Merged Two-Stage Power Converter With Soft Charging Switched-Capacitor Stage in 180 nm CMOS

In this paper, we introduce a merged two-stage dc-dc power converter for low-voltage power delivery. By separating the transformation and regulation function of a dc-dc power converter into two stages, both large voltage transformation and high switching frequency can be achieved. We show how the sw...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2012-07, Vol.47 (7), p.1557-1567
Main Authors: Pilawa-Podgurski, R. C. N., Perreault, D. J.
Format: Article
Language:English
Subjects:
Applied sciences
Buck converter
Capacitors
Charging
Circuit properties
CMOS
CMOS power delivery
Control
Converters
DC-DC converter
Density
Design. Technologies. Operation analysis. Testing
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
feed-forward
Integrated circuits
Logic gates
merged two-stage
Power converters
power management
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
soft charging
switched capacitor converter
Switches
Switching
Switching frequency
Switching, multiplexing, switched capacity circuits
Transformations
Transistors
Voltage control
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Summary:In this paper, we introduce a merged two-stage dc-dc power converter for low-voltage power delivery. By separating the transformation and regulation function of a dc-dc power converter into two stages, both large voltage transformation and high switching frequency can be achieved. We show how the switched-capacitor stage can operate under soft charging conditions by suitable control and integration (merging) of the two stages. This mode of operation enables improved efficiency and/or power density in the switched-capacitor stage. A 5-to-1 V, 0.8 W integrated dc-dc converter has been developed in 180 nm CMOS. The converter achieves a peak efficiency of 81%, with a regulation stage switching frequency of 10 MHz.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2012.2191325