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A 0.9-V input discontinuous-conduction-mode boost converter with CMOS-control rectifier

Authors Man, Tsz Yin HKUST affiliated (currently or previously)
Mok, Philip K.T. View this author's profile
Chan, Mansun View this author's profile
Issue Date 2008
Source IEEE journal of solid-state circuits , v. 43, (9), 2008, SEP, p. 2036-2046
Summary A 0.9-V input discontinuous-conduction-mode (DCM) boost converter delivering 2.5-V and 100-mA output is presented. A novel low-voltage pulse-width modulator is proposed. The modulator can be directly powered from the 0.9-V input instead of using the 2.5-V output as in general modulator designs. Sophisticated low-voltage analog blocks, which normally consume a large amount of power and chip area, are not required in the modulator. The impact of output-voltage ripple and transient-induced output-voltage perturbation on the operation of analog blocks inside the modulator is eliminated. Boost converter start-up sequence is also greatly simplified. A CMOS-control rectifier (CCR) is also proposed to improve converter power efficiency. The CCR is used to replace the conventional rectifying switch to provide adaptive dead-time, which helps to minimize charge-sharing loss and body-diode conduction loss. Corresponding thermal stress on the rectifying switch is hence minimized. The CCR also enables the use of small off-chip inductor and capacitor at sub-MHz switching frequency to improve light-load efficiency. This converter has been implemented in a 0.35-mu m CMOS process. It is designed to operate at similar to 667 kHz with a 1 mu H inductor and 4.7 mu F output capacitor to reduce both switching loss and form factor. Experimental results prove that the converter can be directly powered from 0.9-V input with similar to 85\% efficiency at 100-mA output.
ISSN 0018-9200
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Language English
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