Zero static current power switch circuit with over-current protection, and realization method

Abstract

The invention discloses a zero static current power switch circuit with over-current protection. The circuit comprises a preceding-stage driving circuit with a signal input end and a signal output end, an enable signal EN connected to the signal input end of the preceding-stage driving circuit, a current mirror circuit connected to the signal output end of the preceding-stage driving circuit, anda control circuit connected to the current mirror circuit; the control circuit comprises an MOS transistor M1 with the drain connected to the current mirror circuit, an MOS transistor Msns with the gate connected to the current mirror circuit, a resistor R1 with one end connected with the drain of the MOS transistor Msns and the gate of the MOS transistor M1 and the other end connected with the source of the MOS transistor M1, and an MOS transistor Mpass with the gate connected with the gate of the MOS transistor Msns and the drain connected with the source of the MOS transistor M1; and the sources and the drains of the MOS transistors Msns and Mpass are power input ends VPOS and power output ends VNEG. The purposes of zero static current and low power loss are achieved; the occupied areaof the circuit is small; and a current-limiting protection function is achieved.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a power switch circuit with zero quiescent current and overcurrent protection and its realization method. Background technique [0002] The scale of existing integrated circuits is getting bigger and bigger, the structure of on-chip power system management is becoming more and more complex, and the requirements for low quiescent current are getting higher and higher. If one of the modules works abnormally, it cannot affect the normal operation of other modules. , which requires adding a power switch circuit to the power supply of each module circuit. When the module stops working, disconnect the power supply to reduce the leakage current. When the module is working normally, it is necessary to detect the current consumption of the module and provide protection , to ensure that the power supply of other modules will not be pulled down when there is abnormal power consumption, wh...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a power switch circuit with zero quiescent current and overcurrent protection and its implementation method, so as to solve the problems that the existing power switch circuit occupies a large area, the quiescent current of the circuit is large, and there is power loss

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