LTC4263CS#PBF

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The LTC4263CS#PBF is a standalone Power-over-Ethernet (PoE) controller designed to power IEEE 802.3af and 802.3at compliant PoE applications. This highly efficient and cost effective device minimizes the number of parts and components required to power up to 4 ports of PoE. The internal protection circuitry will limit current if the voltage reaches the user-defined thresholds.

The LTC4263CS#PBF is an integrated power management IC (PMIC) specifically designed for IEEE 802.3af/at applications. It consists of 5 separately operating power stages with independent control logic and status monitoring capabilities. The power stages include DC/DC converters, Power-over-Ethernet (PoE) controller, and line-side interface logic. Each stage has its own dedicated protection circuitry, monitoring the current flowing through the MOSFETs, the output voltage and temperature of the device, and the presence of a voltage on the input source.

IEEE 802.3af/at applications are also known as “Power-over-Ethernet” (PoE) applications. PoE is a technology which enables electronic systems to provide power over twisted-pair Ethernet cabling. In other words, one can transmit data and power over the same twisted-pair cable without having to install any additional power cabling. The LTC4263CS#PBF implements the IEEE 802.3af/at standard for power delivery over Ethernet. It provide the power and signal controlling features required for successful implementation of the PoE protocol.

The LTC4263CS#PBF detects the presence of a valid 48V DC voltage source on the Ethernet cable and begins to regulate the current to enable power delivery to the Ethernet device. The PoE controller drives an external MOSFET to deliver up to 4.5 watts of power to powering connected devices. It also monitor voltage, current and temperature level on each channel input to maintain the overall system safety. In addition, it has an on-chip ADC for measuring and logging the current on each channel.

The internal control loop of the LTC4263CS#PBF regulates the output voltage by controlling the MOSFET gate through the on-chip Gate Driver. This ensures a stable and constant output voltage, which makes the IC ideal for powering remote Ethernet devices. The on-chip gate driver can be programmed to provide a gate voltage of up to 9 V, allowing for increased output voltage for heavier loads. The IC also contains an on-chip timer that can be configured to automatically turn off the MOSFET gate and disable power delivery to the attached Ethernet device after a user-defined timeout period.

The LTC4263CS#PBF also provides a number of protection features. The internal protection circuitry will limit the current drawn from the source if the voltage reaches a user-defined threshold. The IC also has short circuit protection, over temperature protection, and overvoltage protection. Furthermore, the LTC4263CS#PBF contains both absolute maximum ratings and DC operation specifications to ensure proper operation in all environmental conditions.

In conclusion, the LTC4263CS#PBF is a highly efficient and cost effective PMIC specifically designed for IEEE 802.3af/at applications. It features 5 independently operating power stages with independent control logic, providing safety features for the system. It also offers a dedicated protection circuit, a programmable timer, and on-chip ADC for measuring current. With its advanced features, this IC is ideal for powering up remote Ethernet devices.

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