LTC4268CDKD-1

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LTC4268CDKD-1 is a power management integrated circuit (PMIC) specifically designed to meet the IEEE 802.3af Power-over-Ethernet (PoE) Standard. It is used as a Power Sourcing Equipment (PSE) to provide power to powered devices over an Ethernet connection. The controller provides low power standby current and is optimized for relatively low input voltages. LTC4268CDKD-1 is ideally suited to the Ethernet applications.

The LTC4268CDKD-1 incorporates a number of circuit protection features, such as overvoltage protection, overcurrent protection, over-temperature protection and short-circuit protection. It also includes an adjustable current limit, which is adjustable to minimize power loss if the PoE connection is overloaded. This ensures that LTC4268CDKD-1 is suitable for a variety of PoE applications.

In addition, the controller can be used in systems that require more than the IEEE 802.3af 15.4 W of power, such as systems that employ the 802.3at PoE+ system. It can provide up to 25.5 W of power when it is used in an 802.3at compound power system. However, this capability is limited to a maximum power of 35.0 W for a single power system.

LTC4268CDKD-1 also provides a number of features that make it well-suited for Ethernet applications. It supports two-port fast-speed IEEE 802.3af/at Ethernet applications, and also includes an auto-negotiation port. This auto-negotiation port enables the controller to automatically detect and configure itself to support both half- and full-duplex operation of an Ethernet connection.

The working principle of LTC4268CDKD-1 is based on the principle of regulated power supply. The controller responds to signals generated by the Ethernet connection and uses these signals to regulate the output voltage. In particular, it uses a current-mode control technique to precisely control the output voltage, maintaining a power supply with a regulated current at the output. This technique ensures that the output voltage remains within the operating range despite changes in load or input voltage. In addition, the controller also supports a Standby Mode, which reduces the power consumption in standby or low duty-cycle applications.

Overall, LTC4268CDKD-1 is an ideal controller for Power Over Ethernet (PoE) applications. It is designed to meet the requirements of IEEE 802.3af/at with its adjustable current limit, auto-negotiation port, and other features. The controller provides low power standby current and can provide up to 35 W of power for single-port Ethernet connections. With its regulated current-mode control and support for a Standby Mode, it can ensure reliable power delivery in a variety of PoE applications.

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