LTC4269CDKD-2#PBF

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LTC4269CDKD-2#PBF, a power management integrated circuit (PMIC) for Power Over Ethernet (PoE) controllers, is specifically engineered for the purpose of delivering a precise voltage and current rating to devices over long distances.It\'s a great cost effective solution for devices that require higher power or that are in hard-to-reach areas. In this article, we\'re going to discuss the application field of the LTC4269CDKD-2#PBF as well as its working principle.

Application Field

The LTC4269CDKD-2#PBF is designed to provide over-current protection and high-power PoE capability on Power over Ethernet (PoE) ports. It offers a wide selection of output current ratings, ranging from 0.6A to 4.5A, and can support Power over Ethernet bridges with up to 80 watts. It has an adjustable intensity LED to indicate your power status, as well as a separate adjuster for data/power priority. The LTC4269CDKD-2#PBF is able to detect and respond to various Ethernet data rates and can deliver both 2-pair and 4-pair PoE solutions. It can support both Type 2 (PoE+) and Type 3 (65W PoE) systems, as well as legacy 10/100Mbps and Gigabit Ethernet. This makes it an ideal solution for applications such as IP cameras, wireless access points, VoIP phones, and more.

Working Principle

The LTC4269CDKD-2#PBF follows a four-step process to provide power to compatible end-nodes over Ethernet. First, it\'s necessary for the device to detect a valid Powered Device (PD) - the device that requires power over the Ethernet cable. This is accomplished by a Detection and Classification Sequence, which tests for a valid PD as well as the required power. If a valid PD is found, the power will turn on and the LED indicator will be illuminated. Second, the device will automatically switch over to a higher voltage and current rating if required. This is done by the Automatic Maximum Allocation Sequence that adjusts the power levels based on the PD\'s requirements. Third, the device will deliver power over the cable by sending an enable signal over the Data-Pairs and Power-Pairs. Fourth, it will deliver the correct power rating to the PD using a Constant Voltage and Constant Current regulation loop.

Once the PD has been detected and the power is supplied, the LTC4269CDKD-2#PBF will monitor and protect the cable, port, and system from excessive current and voltage. Cables and ports are monitored using Cable Discharge Event and Overload Current Protection, respectively. These two functions ensure that the system is safeguarded from voltage and current surges. Additionally, the device will detect disconnects and shorts and will shut off power to avoid overloads. Finally, the LTC4269CDKD-2#PBF provides a current limiter soft start to regulate the current output and prevent overloading.

Conclusion

The LTC4269CDKD-2#PBF is a PMIC for Power over Ethernet controllers that is specifically designed to deliver a precise voltage and current rating to devices over long distances. It is capable of supporting Power over Ethernet bridges with up to 80 watts, as well as 10/100Mbps, Gigabit Ethernet, Type 2 and Type 3 compatible technologies. The device follows a four-step process to provide power to compatible end-nodes over Ethernet. It also provides protection against voltage and current surges, disconnects, and shorts. Both the power management function and protection features make the LTC4269CDKD-2#PBF a great option for PoE applications.

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