LT4256-2CS8#TRPBF Integrated Circuits (ICs)

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The LT4256-2CS8#TRPBF is a hot-swap MOSFET controller for safe board level hot swapping of power supply rails, bridging between wall power and PCBs. As such, this device serves as an indispensable tool for a range of applications, from powering up consumer electronics to data storage, server rack systems and more.

A typical application field for the device is found in consumer electronics where the device can be used to provide safety measures to power management chips and power supplies during “hot-swap” operations, that is, powering up or down a PCB. The device also serves as a means of protection when power supplies are shut off or momentarily hot-swapped due to power or voltage faults.

Working Principle

The LT4256-2CS8#TRPBF functions as a hot-swap MOSFET controller. It consists of low RDS on MOSFETs, consisting of a logic-level NMOS pull-up and a logic-level PMOS pull-down transistor. In this way, the device senses the voltage of the load and — if it is within the allowed range — will turn off the power supply when the power supply drops below a pre-defined threshold. Once the power supply drops below the threshold, the logic level of the hot-swap output is pulled low, thus disabling the power supply.

The device also has a temperature sensor, which is used to detect whether the temperature of the area around the device is within safe limits. If the temperature rises above a certain threshold, the device will turn off the power supply, thus providing a measure of protection against system crashes.

In addition to these features, the device also has a slew-rate control input, which allows the user to adjust the rate of increase and decrease of the logic level of the hot-swap output. This allows the user to select an appropriate rate of rise and fall for their application. The device also has a status output, which provides feedback about the device\'s state as well as an under-voltage/over-voltage alarm feature.

Conclusion

The LT4256-2CS8#TRPBF is an invaluable tool for hot swapping of power supply rails without the need for specialized hardware. Its working principles include a logic-level NMOS pull-up and a logic-level PMOS pull-down transistor, a temperature sensor, a slew-rate control input, and a status output. This device provides safety measures to power management chips and power supplies during “hot-swap” operations and is essential for many applications, ranging from consumer electronics to data storage and server rack systems.

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