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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。使用集成的负载开关可减少 BOM 数量并加快产品上市速度。

灵活的时序

选项包括固定或可调的线性上升时间。此特性可用于管理浪涌电流或功率序列负载

更低功耗

对于电池供电型应用,TI 提供了关断电流低至 10nA 的负载开关。

宽电流范围

选择可支持低中高电流轨的开关

广泛的封装选项

查找最适合您的制造环境的封装选项。

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。

Hover over a block for additional information

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.

精选文献

All Load Switch products

了解什么是负载开关、何时应使用负载开关以及如何在系统中实施负载开关等基本知识。

主要的负载开关资源

借助集成负载开关,您可以将解决方案尺寸减小 90%,大大简化设计过程。这些简短的视频介绍了可以通过集成解决方案克服哪些挑战。

从集成负载开关专家处获取建议和支持,个性定制您的培训体验。了解我们的按需培训视频、应用手册、参考设计及更多内容。

正在寻找其他电源开关?

如果希望减小解决方案尺寸、进行配电、利用保护功能提高稳健性,或希望诊断电流问题,请查看我们的其他产品系列。 

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