A load switch and electronic equipment

Abstract

The invention provides a load switch and electronic equipment. A first ESD protection branch circuit of the load switch comprises an ESD device and a boosting ESD unit, the maximum withstand voltage value of the input end of the load switch is increased to the sum of the breakdown voltage of the ESD device and the conducting voltage of the plurality of second diodes through the ESD device and theplurality of serially connected second diodes. Meanwhile, the first branch circuit and the second branch circuit of the boost ESD unit also respectively provide discharge passages for the positive ESDenergy of the input end of a switch unit, the negative ESD energy at the input end of the switch unit and the positive ESD energy of the output end of the switch unit. On the premise that the normalESD protection function of the switch unit is guaranteed, the maximum voltage withstand value of the input end and the output end of the switch unit is increased.

Description

technical field [0001] The present application relates to the technical field of integrated circuits, and more specifically, to a load switch and electronic equipment. Background technique [0002] In an electronic system, a load switch is generally used to connect or isolate two ports, such as cutting off or connecting a power supply. The load switch and its control circuit can be integrated on the same IC (Integrated Circuit, integrated circuit), or can be a separate component. MOSFET (Metal Oxide Semiconductor Field Effect Transistor, Metal Oxide Semiconductor Field Effect Transistor) is a commonly used load switching element. [0003] refer to figure 1 , figure 1 The MOS transistor and the gate control circuit constitute the switching unit. In order to improve the ESD (Electro-Static discharge, electrostatic discharge) capability of the load switch, it is usually necessary to connect a ground in series with the input terminal IN and the output terminal OUT of the MOS ...

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Problems solved by technology

The voltage at which the ESD device starts to conduct and generate protection is called the breakdown voltage. In this case, the working voltage of the port of the load switch protected by the ESD device must be lower than its breakdown voltage, otherwise the normal working voltage of the port will be burned ESD device, so the breakdown voltage of the ESD device limits the maximum withstand voltage value of the load switch port. When the maximum withstand voltage value of the load switch needs to be higher than the breakdown voltage of the ESD device, figure 1 The load switch circuit shown is difficult to meet the requirements

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