| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an integrated circuit device for more appropriately increasing power supply voltage to a predetermined voltage depending on the number of integrated circuit chips that operate with voltage supplied from a boost power supply circuit. <P>SOLUTION: The integrated circuit device includes a channel number detection circuit 50 for detecting, when an output terminal voltage Vpgm drops during boost switching control for controlling a transistor N2 is performed such that the output terminal voltage Vpgm reaches a voltage V2, the number Nch of operating channels based on the dropped output terminal voltage Vpgm, and a switching control circuit 70 for performing boost switching control by using clock signals CLK for controlling on-time and off-time which are adjusted based on the number Nch of operating channels. As a result, the boost switching control is appropriately performed based on the number Nch of operating channels and the power supply voltage is more appropriately increased to the voltage V2 even when the number Nch of operating channels increases during the boost switching control. <P>COPYRIGHT: (C)2012,JPO&INPIT |
