Patent ID: 7948809

Claim:
A regulator comprising: a differential amplifier including a differential input stage that differentially receives a reference voltage and an output terminal voltage of the regulator; a drive transistor that has an output connected to an output terminal of the regulator and that has a control terminal connected to an output of the differential amplifier; first and second transistors connected in series between the control terminal of the drive transistor and a first power supply terminal; and third and fourth transistors connected in series between the control terminal of the drive transistor and a second power supply terminal, wherein a control terminal of the first transistor and a control terminal of the third transistor are directly or indirectly connected to outputs of the differential input stage, and a control terminal of the second transistor and a control terminal of the fourth transistor are connected to a first control signal and a second control signal, respectively, the second control signal being on-off controlled by the first control signal and the fourth transistor being on-off controlled by the second transistor.