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| Title: | A 0.9-V input discontinuous-conduction-mode boost converter with CMOS-control rectifier |
| Authors: | Man, Tsz Yin
Mok, Philip
Chan, Mansun |
| Keywords: | Sub-1V
Adaptive dead-time
Boost converter
Discontinuous-conduction mode |
| Issue Date: | 2008 |
| Citation: | IEEE journal of solid state circuits, v. 43, no. 9, September 2008, p. 2036-2046 |
| Abstract: | 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-μm CMOS process. It is designed to operate at ~667 kHz with a 1 μH inductor and 4.7 μF 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 ~85% efficiency at 100-mA output. |
| Rights: | © 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| URI: | http://hdl.handle.net/1783.1/6100 |
| Appears in Collections: | ECE Journal/Magazine Articles
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| inputDiscon.pdf | | 1301Kb | Adobe PDF | View/Open |
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