What is Power Over Ethernet (PoE) IC : Top Manufacturers

A Power over Ethernet (PoE) IC is a semiconductor component that enables electrical power and data transmission through a single Ethernet cable. PoE ICs simplify network installations by eliminating separate power wiring and are commonly used in IP cameras, wireless access points, VoIP phones, and IoT devices.

Key Features of PoE ICs

Here’s a breakdown of the crucial features that define PoE ICs:

PSE Device Integration: PoE ICs are commonly found in PSE (Power Sourcing Equipment) devices, such as PoE switches or injectors. These devices supply power to PDs (Powered Devices) via Ethernet cables. The PoE IC within a PSE manages power delivery, control, and monitoring, ensuring safe and efficient power transfer to connected PDs.
Power Management and Regulation: The IC meticulously regulates and manages the power delivery process, supplying the precise amount of power each PD needs based on its requirements and the negotiated power level.
IEEE 802.3af/at/bt Compliance: PoE ICs adhere to the IEEE 802.3af/at/bt standards, which provide the specifications and protocols for PoE implementations.
Power Classification Support: PoE ICs support power classification mechanisms like Type 1 (802.3af), Type 2 (802.3at), and Type 3/4 (802.3bt), enabling efficient power allocation.
Ethernet Communication: Beyond power delivery, these ICs also support standard Ethernet communication protocols for seamless data transmission between network devices.
Diagnostic and Monitoring: Some PoE ICs offer diagnostic and monitoring features, providing real-time feedback on the power delivery system’s status.

PoE IC Selection Criteria

Choosing the right PoE IC from various vendors requires careful consideration. Here are some key parameters to ensure compatibility, performance, and reliability:

PoE Standard Compliance: Ensure the IC complies with the relevant IEEE 802.3af/at/bt PoE standards.
Power Output: Select an IC that can deliver the required power for your specific application.
Number of Ports: Consider the number of PoE ports needed for your application.
Power Management Features: Look for features like power limiting, current monitoring, and voltage regulation.
Integrated Functionality: Explore ICs with built-in functionalities like Ethernet switch capabilities and LED drivers.
Efficiency: High efficiency is crucial for minimizing heat dissipation and maximizing power delivery.
Protection Features: Prioritize ICs with robust protection features like overcurrent protection, overvoltage protection, short circuit protection, and thermal shutdown.
Temperature Range: Ensure the IC’s operating temperature range meets the requirements of your application.
Package Type and Form Factor: Select a package type and form factor suitable for your board design.

PoE IC Vendors

Here’s a table showcasing several PoE IC vendors and their offerings:

PoE ICs Vendors	Description
Skyworks Solutions, Inc.	Part Number: Si3406x
Analog Devices (ADI)	Part Number: MAX5940
Texas Instruments (TI)	Part number: TPS2372
Maxim Integrated	Part Number: MAX5940
STMicroelectronics	Part Number: ST802RT1A
Linear Technology (now part of Analog Devices)	Part Number: LT4276
Renesas Electronics	Part Number: RAA458250FYTAX
Microchip Technology	Part Number: MCP19114

Summary

A PoE IC enables simultaneous power and data delivery over Ethernet networks. Manufacturers develop PoE integrated circuits for networking equipment, surveillance systems, industrial IoT devices, and smart building applications.