Over-temperature protection circuit and PA chip

The invention provides an over-temperature protection circuit and a PA chip, and belongs to the technical field of chip design. The over-temperature protection circuit comprises a voltage division circuit, a temperature detection circuit, a signal driving circuit and an over-temperature protection signal output circuit, the voltage division circuit is connected with the temperature detection circuit and is used for providing a voltage value corresponding to the protection temperature for the temperature detection circuit, and the voltage value corresponding to the protection temperature comprises an over-temperature protection starting voltage value or an over-temperature protection closing voltage value; the temperature detection circuit is connected with the signal driving circuit and is used for outputting a conduction voltage to the driving circuit when the temperature detection circuit is conducted; and the signal driving circuit is connected with the over-temperature protection signal output circuit and