LTC4296-1/LTC9111 SPoE/PD Controllers

ADI's LTC4296-1 is an IEEE 802.3cg-compliant, five port, Single-Pair Power over Ethernet (SPoE), PSE controller. SPoE simplifies system design and installation with standardized power and Ethernet data over a single-pair cable. It is designed for interoperability with 802.3cg PDs in 24 V or 54 V systems. The LTC4296-1 delivers power using external, low drain-to-source on-resistance (R_DS(ON)), N-channel metal-oxide semiconductor field-effect transistors (MOSFETs), which minimize voltage drop and ensure application ruggedness.

The LTC4296-1 provides a versatile SPoE, PSE solution for 10BASE-T1L controllers and switches and can easily be integrated with ADI's 10BASE-T1L transceiver portfolio, such as the ADIN1100 (physical layer, PHY), ADIN1110 (MACPHY), and ADIN2111 (2-port switch).

The LTC9111 is an IEEE 802.3cg-compliant SPoE PD controller. A wide 2.3 V to 60 V operating range capability and polarity correction make the LTC9111 particularly well suited for classification-based systems in building and factory automation.

SCCP-based classification ensures full operating voltage is applied by the PSE only when a valid PD is connected. The LTC9111 drives two external N-channel MOSFET switches during classification with micropower operation to minimize reservoir capacitor requirements. An external N-channel MOSFET switch isolates the output capacitance from the connector during classification and inrush. A voltage supervisor enables the external MOSFET when the PD input voltage exceeds the on-voltage threshold for the configured class and after a mandated delay. The EN output asserts after the controlled GATE pin ramp-up. The MOSFET is disabled if the input voltage drops below the off-voltage threshold for the configured class. The LTC9111 drives a pair of external low-side N-channel MOSFETs with a low start-up voltage of 1.6 V for polarity correction with reduced power losses.

The EVAL-SPoE-KIT-AZ is an IEEE 802.3cg SPoE evaluation kit. The kit features the LTC4296-1, 5-port SPoE PSE controller, and the LTC9111, SPoE PD to evaluate IEEE 802.3cg Class 10 through 15 SPoE power. The ADIN1100, 10BASE-T1L PHY provides the Ethernet data in the system.