inductive switching power supply with improved efficiency

摘要

The DC-DC converter (100) comprises an inductor (101) connected between a supply line (104) and a ground line (105) through a switching MOS transistor (102); and a voltage multiplying circuit (103) formed by a plurality of voltage multiplying stages (107.1, 107.2) of capacitive type, connected together in cascade and each having an input connected to an intermediate node (106) between the inductor (101) and the MOS transistor (102), and an output supplying a potential (VH1, VH2) equal to the potential (V1) of the intermediate node (106) multiplied by a respective multiplication factor. Each voltage multiplying stage (107.1, 107.2) comprises a plurality of parallel, selectively connectable boosting branches (108.1-108.4, 109.1-109.4). The number of the active boosting branches (108.1-108.4, 109.1-109.4) is determined according to the energy required by the loads (120.1, 120.2). IMAGE