LTC4268IDKD-1#PBF

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The LTC®4268IDKD-1#PBF is a high performance and high integration controller for Power Over Ethernet (PoE) applications that operates on either mains or DC power. It combines an efficient buck-boost power converter with an on-board Ethernet interface and support for second generation PoE standards (IEEE 802.3at Type III and dual Class 4) and provides a complete solution for portable and distributed applications. Compared to the conventional low voltage, discretely-based, PoE charging and powering systems, the LTC4268IDKD-1#PBF offers significant design and system cost savings, improved power efficiency and higher reliability.

The LTC4268IDKD-1#PBF is a high-integrity device with an integrated Ethernet controller, an auto-detect input power selector, a buck-boost regulator and PoE PD power interface. The controller provides up to 48VDC of output power with a maximum of 25W delivery to the powered device (PD). The power of the PD can be adjusted with the on-board digital potentiometer and the controller will detect the voltage level of PD and adjust the power path to ensure that the output power is within the required range. The single supply input voltage ranges from 9V to 28V and has in-built over-temperature, over-voltage and under-voltage protection.

The LTC4268IDKD-1#PBF has two selectable Power Over Ethernet (PoE) modes: type 3 (installation) and dual Class4 (long-term). Type 3 mode is for rapid charging of PDs with a maximum power of 25W and allows for powering of PDs from 24V or 48V with an over current protection of 30A. The dual Class4 mode is designed for long-term power delivery of PDs with a maximum power of 16W and allows 24V or 48V input. In both modes, the controller monitors the temperature of the PD and adjusts the power supply in order to maintain the performance of the PD without exceeding the temperature limit.

The LTC4268IDKD-1#PBF features a wide range of features and performance characteristics. It includes an integrated Ethernet controller which provides 24/48VDC PoE detection and on-board IEEE 802.3at compliant PD auto-detection. In addition, it provides input protection up to ±60V, output short circuit protection, over-temperature and voltage protection and undervoltage lockout. The controller is also capable of tracking the voltage of the PD and automatically adjusting the output power path to ensure that the power is within the required range.

The controller also supports diode-OR enable, chip enable, and synchronize enable. These features allow the controller to accurately detect the power level of the connected PD and enable efficient power delivery. It provides a user-programmable output voltage range of 9V-48V, a low voltage start-up of 9V and rise/fall time control. The device also has an adjustable current limit, adjustable output voltage, and adjustable voltage limit.

In summary, the LTC4268IDKD-1#PBF is an integrated, high-performance PoE controller designed to provide efficient and reliable power delivery to a PD from a mains or DC power source. It provides input protection up to ±60V, output short circuit protection, over-temperature and voltage protection and undervoltage lockout, and features an integrated Ethernet controller, auto-detect input power selector and support for both Type 3 and dual Class4 PoE standards. The device is highly integrated, low power consuming and provides efficient and reliable power delivery to a PD from a mains or DC power source.

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