The NIS5112 Smart HotPlug is an integrated in-rush current controller and MOSFET with built-in thermal protection. The NIS5112 simplifies the design and implementation of hot swap applications while freeing up board space and increasing reliability. Prior to the NIS5112, a designer could either discretely design in-rush current protection or implement a hot swap controller approach. The discrete approach can be very complicated and unreliable especially in the short circuit scenario. An alternative is to use a controller, external MOSFET and power sense resistor approach. This approach requires many components and can be very complicated to design and also is difficult to calculate the external MOSFET temperature during a short circuit. The NIS5112 integrates a controller and SenseFET, which monitors and actively limits potentially harmful inrush current during startup or short circuit conditions. A standard chip resistor is used to adjust the current limit instead of an expensive power sense resistor typical found in other non integrated solutions.
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