PoE 2 controllers provide advanced power management features

Analog Devices Inc. LTC9101-1, LTC9102, and LTC9103 PoE 2 Controllers, available now from Mouser, are created for usage IEEE 802.3at Type 2, 802.3bt Type 3, and 4 compliant PoE systems. They implement up to 24 (71.3W) four-pair or 48 (25.5W) two-pair PSE ports in either an endpoint or midspan application. Virtually all necessary circuitry is incorporated to implement an IEEE 802.3bt compliant PSE design, needing a pair of external power MOSFETs and sense resistors per port. This integration reduces power loss compared to alternative designs with onboard MOSFETs and increases system reliability.

Advanced power management features of the devices comprise 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 offered. PD detection employs a proprietary multi-point detection mechanism, providing excellent immunity from false PD identification. Autoclass detection and five-event physical classification are supported.

The 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 provided in a 4mm x 4mm QFN-24 package. The LTC9102 and LTC9103 are offered in a 7mm x 11mm QFN-64 package. All three devices feature a -40C to +125C operating temperature range.