Patent ID: 9201437
Filing Date: 2015-12-01
Classification: G05F

Abstract:
1. A multi-input low dropout regulator, comprising: an amplifier having a plurality of first input terminals, a second input terminal, and an output terminal, wherein each first input terminal of the plurality of first input terminals is used for receiving corresponding internal voltage respectively, and is not connected to another first input terminal of the plurality of first input terminals; a first metal-oxide-semiconductor transistor having a first terminal for receiving a first voltage, a second terminal coupled to the output terminal of the amplifier, and a third terminal coupled to the second input terminal of the amplifier; and a resistor having a first terminal coupled to the third terminal of the first metal-oxide-semiconductor transistor, and a second terminal for receiving a second voltage; wherein a voltage of the first input terminal of the plurality of first input terminals of the amplifier is equal to a voltage of the second input terminal of the amplifier when the amplifier operates normally, and the third terminal of the first metal-oxide-semiconductor transistor is further used for coupling to a monitor pad, and the monitor pad is used for outputting the corresponding internal voltage.