Patent ID: 8773089

Claim:
A regulator, comprising: a first amplifier having a first input terminal for receiving a reference voltage, a second input terminal, and an output terminal; a second amplifier having a first input terminal for receiving the reference voltage, a second input terminal, and an output terminal; a transmission unit coupled between the output terminal of the first amplifier and the output terminal of the second amplifier, wherein the output terminal of the first amplifier is coupled to the output terminal of the second amplifier through the transmission unit, and the transmission unit is kept turning on; a current control circuit having a first terminal for receiving a first voltage, and a second terminal; a first P-type metal-oxide-semiconductor transistor having a first terminal coupled to the second terminal of the current control circuit, a second terminal coupled to the output terminal of the first amplifier, and a third terminal coupled to an output terminal of the regulator; a second P-type metal-oxide-semiconductor transistor having a first terminal for receiving the first voltage, a second terminal coupled to the output terminal of the second amplifier, and a third terminal coupled to the output terminal of the regulator; and a feedback circuit having a first terminal coupled to the output terminal of the regulator, and a second terminal coupled to the second input terminal of the first amplifier and the second input terminal of the second amplifier; wherein the transmission unit is used for keeping a voltage drop between the first terminal and the second terminal of the first P-type metal-oxide-semiconductor transistor during operation of the regulator in a light load mode at a voltage drop between the first terminal and the second terminal when the first P-type metal-oxide-semiconductor transistor is turned on.