LTC4279IUFD#PBF

Power - Max:	90W
Internal Switch(s):	No
Auxiliary Sense:	No
Standards:	802.3at (PoE+), 802.3af (PoE), LTPoE++
Voltage - Supply:	45 V ~ 57 V
Current - Supply:	1.7mA
Operating Temperature:	-40°C ~ 85°C
Package / Case:	20-WFQFN Exposed Pad
Supplier Device Package:	20-QFN (5x4)
Base Part Number:	LTC4279
Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Controller (PSE)
Number of Channels:	1

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Introduction

The LTC4279IUFD#PBF is a Power Management IC (PMIC) designed for Power over Ethernet (PoE) controllers. It is an integrated circuit (IC) designed to manage and deliver power over twisted pair Ethernet cables. The LTC4279IUFD#PBF is designed to meet the 802.3at and 802.3af Power over Ethernet (PoE) specifications and provide the correct power delivery and protection for a wide range of PoE applications.

Application field

The LTC4279IUFD#PBF is ideal for use in applications where reliable power delivery, fault protection and circuit monitoring are needed over Ethernet cables. These can include Power over Ethernet (PoE) switches, HVAC equipment, access control systems, surveillance systems, lighting systems, and many other similar applications. This IC supports up to four pairs (data and power) of Ethernet and includes a wide range of protection features.

Features

The LTC4279IUFD#PBF includes several important features that make it a great choice for PoE applications. It can deliver up to 63W of power, offering greater power capability than standard PoE devices. It is designed with a robust Universal Input feature which allows it to interpret and prioritize alternating current (AC) or direct current (DC) power sources, such as those provided by batteries, solar power, or grid power. It also has comprehensive fault protection features to protect against short circuits, over-current, over-voltage, and over-temperature. The IC also has a fast Fault Notification feature which enables it to quickly detect and report an impending fault, eliminating the need for costly downstream fault protection.

Working Principle

The working principle of the LTC4279IUFD#PBF is to detect and identify power sources on the Ethernet cable, such as those provided by a PoE switch, and to then deliver the appropriate power to the downstream device. It is able to detect both AC and DC power sources and is able to prioritize one over the other. The IC also includes a variety of fault protection features, which can detect and protect against problems such as over-voltage, over-current, short circuits, and over-temperature. These fault protection features ensure that the IC is able to provide reliable power delivery over the Ethernet cable, with minimal risk of damage. Once the appropriate power is detected and delivered, the IC can then monitor and report on the status of the power delivery. This information can be used by downstream devices to ensure that the power delivery is consistent and safe.

Conclusion

The LTC4279IUFD#PBF is a robust and reliable PoE IC that can be used in a wide range of applications. It is designed to meet both 802.3at and 802.3af Power over Ethernet (PoE) specifications and is capable of delivering up to 63W of power. It includes a wide range of protection features to protect against fault conditions, and can monitor and report the status of the power delivery. This makes it a great choice for applications that require reliable power delivery, fault protection and monitoring.

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