LTC4255CG#PBF

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LTC4255CG#PBF is a full featured, lower cost Hot Swap power controller with integrated current sense and protections available in a 28-lead ThinSOT package. It is a monolithic integrated circuit that delivers complete Hot Swap power control and protection required by most Power Over Ethernet (PoE) systems. This Hot Swap controller provides programmable overtemperature, overvoltage and current limit protection, as well as inrush limit current control. The device consists of a N-channel MOSFET, a current-sensing resistor and an under-voltage lockout (UVLO). It also provides overcurrent shutdown protection against both current sourcing and current sinking.

The power monitor of the LTC4255CG#PBF is capable of accurately measuring both ac and dc currents. The Hot Swap controller also acts as a power switch that can be used to enable or disable the supply voltage to a load. The LT4255CG#PBF can be used as a Hot Swap controller in applications that require reverse current protection, such as USB battery chargers and notebook computers, as well as applications where safety is a priority, such as medical devices.

The LTC4255CG#PBF features overcurrent protection, overvoltage protection, and overtemperature protection. The Hot Swap controller has a guaranteed current limit of over 1A, which makes it suitable for a wide range of applications. The overvoltage and overtemperature protection helps to prevent the damage to the load, with the overvoltage protection designed to protect the load from stresses due to external transients and other disturbances. Additionally, the LTC4255CG#PBF also provides a fault indication output, which can be used to signal an overcurrent fault.

The working principle of the LTC4255CG#PBF is based on the principle of current sensing. The current-sensing resistor is used to sense the current in the circuit. The current-sensing resistor is connected in series with the output and has a resistance value of 0.1 ohm. The voltage across the current-sensing resistor is monitored, and the voltage that is sensed helps to determine the current that is passing through the circuit. When the sensed current exceeds the overcurrent threshold, the Hot Swap controller shuts down the circuit, thereby protecting the load from damage.

In addition to providing overcurrent protection, the Hot Swap controller also features an under-voltage lockout (UVLO) which is designed to protect the load from overvoltage. The UVLO has a voltage set point which is adjustable by setting a reference voltage, and the Hot Swap controller automatically shuts down the circuit if the voltage across the output exceeds this set point. The LTC4255CG#PBF also features two protection timers, which are designed to ensure that the device is shut down in the event of an overcurrent condition. The timers also help to reduce the risk of damage to the load due to an overcurrent condition.

The LTC4255CG#PBF is an ideal device for use in a variety of power supply applications, such as USB battery chargers and notebook computers. The Hot Swap controller is also suitable for use in medical devices, military environments, and other applications where safety is a priority. Furthermore, the device features low quiescent current and low stand-by power, making it suitable for battery powered systems. The LTC4255CG#PBF is also available in a 28-pin ThinSOT package, making it easy to use in a variety of applications.

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