LTC1644CGN#PBF

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 PMICs, or Power Management Integrated Circuits, are electronic devices meant to convert, regulate, and control electrical power from a variety of power sources. One of the many types of PMICs is the Hot Swap Controller.The LTC1644CGN#PBF is a Hot Swap Controller from Linear Technology. It is a monolithic CMOS IC designed for safe hot plugging of power rails that can handle up to 16V of input transients and up to 30V of permanent input voltage. The device also features both in-rush current limiting and foldback current limiting for D.C. system application.The primary application of the LTC1644CGN#PBF is to protect sensitive circuits from high energy transients during hot plugging operations. However, the device is also useful in high frequency switching regulators, power supply sequencing, power supply fault tolerance, and general hot plug applications.The working principle of the LTC1644CGN#PBF lies in its ability to determine the source of transients and shut down the power if the levels exceed a predetermined threshold. The device utilises an onboard comparator that constantly monitors the input voltage. If the input voltage exceeds the threshold voltage by more than a predetermined amount (known as the hysteresis), the comparator will activate, sending a signal to the power-on control circuit which will turn off the power.In addition, the device has an in-rush current limiting circuit which helps prevent large surges in current. It works by controlling the rate at which the current can rise by monitoring the voltage across the power supply and limiting the current accordingly. This helps to protect the power supply from these dangerous transients, ensuring a safe and efficient operation.The device also has a foldback current limiting circuitry that performs the same function as the in-rush current limiting circuit, but at a much higher current level. This helps to protect the power supply from failing due to a high-current short circuit.Overall, the LTC1644CGN#PBF is a highly versatile Hot Swap Controller that enables power supply designers to effectively protect their systems from damaging transients during hot plugging operations. The device’s combination of in-rush current limiting, foldback current limiting, and power-on control circuitry helps to ensure reliable operation in a wide range of applications.

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