LTC4267CDHC - Power Over Ethernet Interface Controller

The LTC4267CDHC from Linear Technology is a robust Power over Ethernet (PoE) interface controller designed to simplify the task of implementing Power over Ethernet functionality in various networked devices. As an IEEE 802.3af compliant powered device (PD) interface controller, the LTC4267CDHC integrates a signature resistor, power MOSFET, and current sense into a single package, making it an ideal solution for a wide range of applications such as VoIP phones, wireless access points, and network cameras.

This versatile controller is housed in a compact DHC package and is specifically engineered to work seamlessly with both isolated and non-isolated converters. The LTC4267CDHC features an advanced power management scheme that allows for high efficiency and reliable operation. Its signature resistor and classification current source are integrated, which enables the device to communicate with Power Sourcing Equipment (PSE) to negotiate the power allocation for the PD.

The LTC4267CDHC incorporates a range of protective features to ensure the safety and longevity of the end device. It includes under-voltage lockout, thermal protection, and inrush current control, providing a safeguard against electrical faults and abnormal operating conditions. The controller's high level of integration reduces the need for external components, thereby minimizing the footprint and simplifying the design of PoE-powered devices.

Key features of the LTC4267CDHC include:

• IEEE 802.3af compliant PD interface
• Integrated 25kΩ signature resistor and classification current source
• Supports a wide range of input voltages
• Programmable inrush current control
• Thermal protection with automatic restart
• Over-current protection
• Under-voltage lockout
• Low power dissipation

The LTC4267CDHC provides a compact, reliable, and efficient solution for powering devices over an Ethernet connection, making it an essential component for networked devices requiring remote power delivery. Its ease of use and comprehensive feature set ensure a smooth integration into PoE systems, delivering both power and data connectivity through a single cable.