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Analog Devices Inc. LTC9101-x, LTC9102, and LTC9103 PoE 2 Controllers are designed for use IEEE 802.3at Type 2, 802.3bt Type 3, and 4 compliant Power over Ethernet (PoE) systems. The LTC9101-1/-2, LTC9102, and LTC9103 implement up to 24 (71.3W) 4-pair or 48 (25.5W) 2-pair PSE ports in either an endpoint or midspan application. Virtually all necessary circuitry is included to implement an IEEE 802.3bt compliant PSE design, requiring a pair of external power MOSFETs and sense resistors per port. This integration minimizes power loss compared to alternative designs with onboard MOSFETs and increases system reliability.
Advanced power management features of the LTC9101-x, LTC9102, and LTC9103 include per-port 14-bit current/power monitoring, programmable current/ power limits, and versatile, fast shut-down of preselected ports. An advanced power management host software layer is available. PD detection uses a proprietary multi-point detection mechanism, ensuring excellent immunity from false PD identification. Autoclass detection and 5-event physical classification are supported.
The Analog Devices Inc. LTC9101-1, LTC9102, and LTC9103 PoE 2 Chipset includes an I2C serial interface operable up to 1MHz. These devices are pin or I2C programmable to negotiate PD delivered power up to 71.3W.
The LTC9101-1 is available in a 4.0mm x 4.0mm QFN-24 package. The LTC9102 and LTC9103 are available in a 7.0mm x 11.0mm QFN-64 package. All three devices feature a -40°C to +125°C operating temperature range.
