负载开关
从分立式开关转变到集成开关
负载开关是开启和关闭电源轨的一种简单而经济高效的方式。我们品类丰富的产品系列包含多种电流、封装和时序选项。此外，我们的参数搜索工具易于使用，将帮助您快速找到可降低设计中关断电流或 BOM 数量的解决方案。
特色负载开关
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什么是负载开关？
TPS229xx 系列的集成负载开关是用于开启和关闭电源轨的集成式电子继电器。大多数基本款负载开关由四个引脚组成：输入电压引脚、输出电压引脚、使能引脚和接地引脚。
以下图示为基本款负载开关的方框图。要获得更高水平的输入或输出功率保护，请查看我们的电子保险丝器件，这些器件具有过压关断、电流限制和短路保护等特性。
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The pass FET is the main component of the load switch, which determines the maximum input voltage and maximum load current the load switch can handle. The on-resistance (RON) of the load switch is a characteristic of the pass FET.
The gate driver charges and discharges the gate of the FET in a controlled manner, thereby controlling the rise time (tR) of the device.
The control logic is driven by an external logic signal. It controls the turn-on and turn-off of the pass FET and other blocks, such as quick output discharge (QOD), the charge pump, and blocks with protection features.
The charge pump is used in load switches with an N-channel FET, since a positive differential voltage between the gate and the source is needed to turn on the FET.
Quick Output Discharge (QOD) is an on-chip resistor from VOUT to GND that is turned on when the device is disabled via the ON pin. This will discharge the output node, preventing the output from floating.
Additional features are included in different load switches. These include, but are not limited to, thermal shutdown, current limiting, and reverse current protection.
Additional features are included in different load switches. These include, but are not limited to, thermal shutdown, current limiting, and reverse current protection.
Additional features are included in different load switches. These include, but are not limited to, thermal shutdown, current limiting, and reverse current protection.
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