The LTC4251-2CS6#TRMPBF is an integrated controller and power manager chip designed for Power over Ethernet (PoE) applications. It is manufactured by Linear Technology, now part of Analog Devices Inc. This component offers various key features that make it suitable for PoE applications.
One of the main features of the LTC4251-2CS6#TRMPBF is its ability to integrate both a powered device (PD) controller and an isolated power supply controller in a single package. This integration simplifies the design of PoE devices and helps reduce overall system cost.
The LTC4251-2CS6#TRMPBF supports the IEEE 802.3af standard for PoE, which enables the transfer of both power and data over a single Ethernet cable. It provides all the necessary functions to manage the power delivery from a Power Sourcing Equipment (PSE) to a PD, including detection, classification, and power delivery control.
The chip features an internal signature detection circuitry that identifies the presence of a valid PSE and verifies its compliance with the IEEE standard. This signature detection eliminates the need for external resistors and simplifies the circuit design.
Furthermore, the LTC4251-2CS6#TRMPBF offers an integrated classified current limit mode with an adjustable current limit threshold. This feature allows optimal power budgeting and helps prevent power supply overload or damage
