An integrated low power buck converter with a comparator controlled low-side switch

Reinhard Enne; Horst Zimmermann

doi:10.1109/DDECS.2010.5491813

13th IEEE Symposium on Design and Diagnostics of Electronic Circuits and Systems

An integrated low power buck converter with a comparator controlled low-side switch

Year: 2010, Pages: 84-87

DOI Bookmark: 10.1109/DDECS.2010.5491813

Authors

Reinhard Enne, Institute of Electrodynamics, Microwave and Circuit Engineering, Vienna University of Technology, Gusshausstr. 25/354, 1040 Vienna, Austria
Horst Zimmermann, Institute of Electrodynamics, Microwave and Circuit Engineering, Vienna University of Technology, Gusshausstr. 25/354, 1040 Vienna, Austria

Abstract

Here the design of an integrated buck-converter leg is presented in which the free-wheeling diode is replaced by a comparator controlled N-MOSFET. This allows eliminating the efficiency reducing voltage drop at the diode while the discontinuous conducting mode (DCM) is still applicable. For this issue, besides the control block also a fast comparator with a special offset reduction circuit is presented. A layout for a converter bridge was done and simulated which is optimized for the best efficiency at a statistically often used point of operation (3.3 V output, 27.5% duty ratio, 1 MHz, 170 mA).

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An integrated low power buck converter with a comparator controlled low-side switch

Authors

Abstract

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