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Efficient LDO-Assisted DC/DC buck converter for integrated power management system
Martínez García, Herminio
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. EPIC - Disseny de circuits analògics integrats i de convertidors de potencia conmutats
DC-DC Switching Converters; Voltage Linear Regulators; Linear-Assisted DC-DC Voltage Regulators.
Àrees temàtiques de la UPC::Enginyeria electrònica
Voltage regulators
Linear-assisted DC/DC converters (or linear-switching hybrid DC/DC converters) consist of a voltage linear regulator (classic NPN or nMOS topologies and LDO) connected in parallel with a switching DC/DC converter. In order to control these hybrid structures
different strategies exist
allowing to fix the switching frequency as a function of some parameters of the linear regulator. This article compares two control strategies that
although can be applied to the same circuital structure of linear-assisted converter
are sensibly different. The first one
reported in previous literature
cancels completely the average current through the linear regulator in steady state to achieve a reduction of the losses. Thus the efficiency of the whole system increases and almost equals the one of the standalone switching converter. The proposed approach
in spite of a slightly increment of linear regulator’s losses
reduces the output ripple due to the crossover distortion of linear regulator output stage.
Convertidors continu-continu
Universidad Miguel Hernández de Elche

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