POWER SUPPLY CIRCUIT, ELECTRONIC DEVICE, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, AND METHOD OF CONTROLLING POWER SUPPLY CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a DC-DC converter for controlling an order of turning on a plurality of power sources. SOLUTION: A switch control circuit 82 controls an on-resistance value of a transistor TS of a switch circuit 44 by controlling an on-resistance value of a transistor T21 according to the result of comparison between a first voltage V1 and a divided voltage V21. Consequently, a second voltage V2 is controlled in proportion to the first voltage V1. COPYRIGHT: (C)2009,JPO&INPIT