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

Author

Enne, Reinhard ; Zimmermann, Horst

Author_Institution

Inst. of Electrodynamics, Microwave & Circuit Eng., Vienna Univ. of Technol., Vienna, Austria

fYear

2010

fDate

14-16 April 2010

Firstpage

84

Lastpage

87

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).

Keywords

MOSFET; bridge circuits; comparators (circuits); power convertors; N-MOSFET; comparator controlled low-side switch; converter bridge; current 170 mA; discontinuous conducting mode; free-wheeling diode; frequency 1 MHz; integrated low power buck converter; offset reduction circuit; voltage 3.3 V; Bridge circuits; Buck converters; Diodes; Leg; MOSFET circuits; Pulse generation; Pulse width modulation; Switches; Voltage control; Zero voltage switching; CMOS buck converter; discontinuous conduction mode; low offset comparator; synchronous rectification;

fLanguage

English

Publisher

ieee

Conference_Titel

Design and Diagnostics of Electronic Circuits and Systems (DDECS), 2010 IEEE 13th International Symposium on

Conference_Location

Vienna

Print_ISBN

978-1-4244-6612-2

Type

conf

DOI

10.1109/DDECS.2010.5491813

Filename

5491813