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This paper presents an integrated DC-DC buck converter with variable output voltage (from 1.2 V up to 5 V) and capability for delivering a wide range of output currents. The converter is optimized for achieving high efficiency, which is in range from 88% to 94.4% for output voltages from 1.2 V to 3.1V and output currents from 0.4 A to 1.2 A. Also, an overview of the converter losses is given, especially...
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...
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