A Fast Transient Response Flying-Capacitor Buck-Boost Converter Utilizing Pseudocurrent Dynamic Acceleration Techniques

A fast transient response flying-capacitor buck-boost converter is proposed to improve the efficiency of conventional switched-capacitor converters. The voltage boost ratio of the proposed converter is 2D, where D is the duty cycle of the switching signal waveform. Furthermore, the proposed structur...

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Bibliographic Details
Published in:IEEE transactions on very large scale integration (VLSI) systems 2015-06, Vol.23 (6), p.1155-1159
Main Authors: Hwang, Yuh-Shyan, Liu, An, Ku, Yi-Tsen, Chang, Yuan-Bo, Chen, Jiann-Jong
Format: Article
Language:English
Subjects:
Acceleration
Capacitors
Charge pumps
dc-dc power converters
Inductors
pulse width modulation converters
Switches
Transient response
Voltage control
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Summary:A fast transient response flying-capacitor buck-boost converter is proposed to improve the efficiency of conventional switched-capacitor converters. The voltage boost ratio of the proposed converter is 2D, where D is the duty cycle of the switching signal waveform. Furthermore, the proposed structure utilizes pseudocurrent dynamic acceleration techniques to achieve fast transient response when load changes between heavy load and light load. The switching frequency of the proposed converter is 1 MHz for 3.3-V input and 1.0-4.5-V output range application. Experiment results show that the proposed scheme improves the transient response to within 2 μs and the total power conversion efficiency can be as high as 89.66%. The proposed converter has been realized by a 2P4M CMOS chip by 0.35-μm fabrication process with total chip size of about 1.5 mm × 1.5 mm, PADs included.
ISSN:1063-8210
1557-9999
DOI:10.1109/TVLSI.2014.2323313