| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a step-up/down circuit that has a small on-resistance of a driving MOS transistor, prevents occurrence of current leakage, and is suitable for down-sizing and reduction of electric consumption. <P>SOLUTION: A step-up circuit comprises: an input terminal 104 to which an input voltage IN2 is input; MOS transistors 201 and 203 that output VCC or GND based on the input voltage IN2; MOS transistors 202 and 204 that output 2VCC or GND based on the input voltage IN2; a capacitative element 206 having one end connected to the MOS transistors 201 and 202 and the other end connected to the MOS transistors 202 and 204; and a MOS transistor 205 having one source/drain terminal supplied with 2VCC, the other source/drain terminal supplied with VCC, and a gate terminal supplied with 2VCC or GND, that is turned on or off by 2VCC or GND. <P>COPYRIGHT: (C)2013,JPO&INPIT |
