| 摘要 |
PROBLEM TO BE SOLVED: To provide a power-OFF circuit which is low in power consumption and small in source voltage dependency. SOLUTION: A detection capacitor 11 is charged with a source voltage Vcc; when the source voltage Vcc drops during power-OFF, the drop is detected by a start capacitor 14 and the detection capacitor 11 is discharged to supply the discharging current to a gate voltage generating circuit 21. The gate voltage generating circuit 21 generates a gate voltage with the discharging current to turn on an output transistor 17, thereby inverting the signal at a control terminal 35. Other circuits are able to detect the power-OFF state from the signal of the control terminal 35.
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