| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switch semiconductor integrated device for changing step-up scaling factor in a boosting circuit depending on a use state of the circuit and reducing a consumption current. <P>SOLUTION: In a charge pump circuit 12, first to fourth depression type FETs 31 to 34, being charging and discharging field-effect transistors, can be on-off-controlled by boosting control signals Vcp1, Vcp2 output from a logic circuit 2. By selecting accordingly on-off states of the first to fourth depression type FETs 31 to 34, charging or discharging operations of first to fourth charging and discharging capacitors 5 to 8 can be selected. As a result, the step-up scaling factor can be changed. <P>COPYRIGHT: (C)2009,JPO&INPIT |
