LT4294HDD#PBF

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Controller (PD)
Number of Channels:	1
Power - Max:	71W
Internal Switch(s):	No
Auxiliary Sense:	Yes
Standards:	802.3at (PoE+), 802.3af (PoE), 802.3bt
Voltage - Supply:	60V (Max)
Current - Supply:	2mA
Operating Temperature:	-40°C ~ 125°C
Package / Case:	10-WFDFN Exposed Pad
Supplier Device Package:	10-DFN (3x3)
Base Part Number:	LT4294

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LT4294HDD#PBF Application Field and Working Principle: An Overview of PMIC - Power Over Ethernet (PoE) Controllers

PoE (Power over Ethernet) technology has been around since the early 2000s, providing an efficient way to power remote devices using an existing Ethernet infrastructure. To make this possible, PoE controllers are used to provide the necessary control signals, converting AC power into DC power and delivering it to the device. In this article we take a look at the LT4294HDD#PBF PoE controller, the application field it is used in and its working principle.

What Is the LT4294HDD#PBF?

The LT4294HDD#PBF is a power-over-Ethernet (PoE) controller designed to work with twisted-pair Ethernet cable. It is compliant with IEEE 802.3 af, 802.3 at and higher standards, and is designed to transfer power to devices over its networks. The device features an integrated DC/DC converter to power the PoE PD (powered device), with up to 4A available output current. It also features integrated current and voltage monitoring, fault detection and protection features.

Application Field

The LT4294HDD#PBF is used in a range of industrial and commercial applications, including security cameras, wireless access points, VoIP phones and even vending machines. This device is often used in critical environments where mission-critical systems are powered remotely and with redundancy. The controller can also be used in ‘light’ device applications, such as wireless music speakers and wireless keyboards.

Working Principle

The LT4294HDD#PBF is used to power remote devices by transforming the local AC supply to DC. This is done using an isolated DC/DC converter that is integrated into the controller. It then extracts the power on the Ethernet cable using a pair of differential sense lines, allowing for up to 4A of output current.The controller also features an integrated controller with built-in voltage and current monitoring, providing a high level of protection and control. This ensures that the connected PD is always kept within safe operating parameters. Additionally, the controller features built-in fault protection, allowing it to detect any faults in the power delivery and shut down the system if necessary.

Conclusion

The LT4294HDD#PBF is a versatile and reliable PoE controller designed for critical applications where power needs to be supplied remotely and with redundancy. The device features an integrated DC/DC converter, current and voltage monitoring, and fault protection, making it an ideal solution for powering mission-critical systems over Ethernet.

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