| 摘要 |
PROBLEM TO BE SOLVED: To reduce a rush current flowing through a constant voltage power supply circuit when power is turned on.SOLUTION: A semiconductor integrated circuit 1 of an embodiment includes a constant voltage generation circuit 12. A differential amplifier 121 outputs a voltage DF according to a difference between a reference voltage Vref and a feedback voltage VFB which is obtained by dividing the output voltage VDD. A PMOS transistor M1 is connected between an input power supply terminal VIN and output terminal OUT, and has a gate terminal to which an output terminal of the differential amplifier 121 is connected. A PMOS transistor M2 is connected in parallel to the PMOS transistor M1. A switch SW is inserted between the output terminal and a gate terminal of the PMOS transistor M2, and is controlled to be opened or closed by a power-on reset signal POR which is output from a power-on reset circuit 11. A pull-up unit 122 is connected between the input power supply terminal VIN and the gate terminal of the PMOS transistor M2, and the conduction thereof is controlled by the power-on reset signal POR. |
