LTC4257IS8#TRPBF

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LTC4257IS8#TRPBF is a Precision Automatic Voltage Positioning MOSFET Driver and Power Over Ethernet (PoE) Controller, supporting the IEEE 802.3af and 802.3at standards for Power Sourcing Equipment (PSE). This integrated device is an ideal solution for automated voltage positioning and protection of Data Line Protection (DLP) MOSFETs from reverse currents and overcurrents in non-standalone and midspan mode applications.

The LTC4257IS8#TRPBF features a high precision, analog voltage positioning regulator that adjusts the gate voltage of a Power Over Ethernet (PoE) MOSFET to accurately position the QUIET drain-to-source voltage. This ensures optimal performance, power supply efficiency and protection of data line protection components.

The device is programmed using the standard or the extended mode, with programming resistors and supports several Power Specific definitions and additional functions, such as inrush current limiting, classification and power limited negotiation. In case of over current or over temperature faults, the device will voluntarily release the power and establish an isolated Class 1 DC-DC interface to check and monitor the fault condition and to determine the maximum power sharing.

The LTC4257IS8#TRPBF features advanced current-mode PWM control and voltage mode control for efficient power supply design and power supply monitoring for precise fault detection. The device\'s programmable current limit, dual bandgap references, undervoltage lockout (UVLO), shoot-through protection, fault output and power feedback loop make this integrated device a reliable, safe and efficient solution for Power Over Ethernet (PoE) applications in both stand-alone and mid-span mode.

The LTC4257IS8#TRPBF offers superior overload and short circuit protection, making it an ideal choice for high power, long duration and reliability-critical applications such as Ethernet servers and telecommunications equipment. It also features a low Power Dissipation (PD) of only 20mW, dramatically increasing system efficiency and reducing heat issues due to its high efficiency, low power dissipation, and ease of integration.

The LTC4257IS8#TRPBF is also capable of autonomously controlling the number of simultaneous Power Sourcing Equipment (PSE) partners in a system, making it a powerful and cost effective solution in Power Over Ethernet (PoE) applications. It also simplifies the implementation and configuration of sophisticated Power over Ethernet (PoE) protocols, allowing the user to start up and shut down individual PSE ports with minimal modifications to the network.

The LTC4257IS8#TRPBF is designed for use in Power Over Ethernet (PoE) applications, including standalone Power Sourcing Equipment (PSE), midspan Power Sourcing Equipment (PSE) and Power Over Ethernet (PoE) equipment for telecommunication and networking systems. It provides an ideal solution for automated voltage positioning and protection of Data Line Protection (DLP) MOSFETs from reverse currents and overcurrents in both stand-alone and mid-span mode applications.

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