A power switch circuit with zero quiescent current and overcurrent protection and its realization method

Abstract

The invention discloses a power switch circuit with zero quiescent current and overcurrent protection, which comprises a pre-stage drive circuit with a signal input terminal and a signal output terminal, an enable signal EN connected to the signal input terminal of the pre-stage drive circuit, A current mirror circuit connected to the signal output terminal of the pre-stage drive circuit, and a control circuit connected to the current mirror circuit; the control circuit includes a MOS transistor M1 whose drain is connected to the current mirror circuit, and the gate is connected to the current mirror circuit. One end of the MOS transistor Msns on the mirror circuit is connected to the drain of the MOS transistor Msns and the gate of the MOS transistor M1, and the other end is connected to the source of the MOS transistor M1. The resistor R1 is connected to the gate of the MOS transistor Msns, The drain of the MOS transistor Mpass is connected to the source of the MOS transistor M1, the sources of the MOS transistors Msns and Mpass are the power supply input terminal VPOS, and the drains are the power supply output terminal VNEG. The invention achieves the goals of zero quiescent current and small power loss, the circuit occupies a small area, and has the function of current limiting protection.

Description

Technical field [0001] The present invention relates to the field of integrated circuits, and in particular, to a zero-active current, a power switching circuit with overcurrent protection and a method of implementing. Background technique [0002] The existing integrated circuit size is getting larger, the structure of the on-chip power system management is increasingly complex, and the requirements of low static currents are getting higher and higher. If one of the modules are abnormal, it cannot affect the normal operation of other modules. This needs to increase the power switch circuit on the power of each module circuit. When this module stops working, the power supply is disconnected to reduce the leakage current, and the current consumption of this module needs to be detected when this module is working properly. To ensure that the power supply of other modules will not be pulled down when there is abnormal power consumption, resulting in a power-off restart of the entire...

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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