Concept and design of hybrid interleaved and isolated micro-converter for low power applications

In this paper, a hybrid interleaved and isolated micro-converter (5V/2A/1MHz) dedicated to low power conversion is presented. In order to be able to address a lot of different applications, its structure is isolated (implementation of a planar coupler) and uses interleaved parallel legs with coupled inductors (lowering internal losses). For very high integration purpose, two chips have been done: one dedicated to the control of the switching-cells and the other implementing the drivers and the power switches. The control part implements an original modular approach dedicated to provide the interleaved carriers and to guaranty the current balancing. The power part discusses the layout constraints to optimize the power density.