Quad PSE Controller IC Meets IEEE 802.3at (PoE+) and IEEE802.3af (PoE)

摘要

Linear Technology's LTC4266 is a four-port Power over Ethernet (PoE) controller IC for power-sourcing equipment (PSE) that can provide IEEE 802.3at (25.5rnW) and proprietary higher power levels (Fig. 2). Thernoutput from each of the ports is applied to a circuit similar to that in Fig. 2.rnNext-generation PoE applications will call for more power to support demanding features, and at the same time demand increased power efficiency in an effort to be more "green" and reduce costs. The LTC4266 provides up to 100 W over four-pair Ethernet cabling, is fully compliant with the new IEEE 802.3at (PoE+) standard, and is backward-compatible with the prior IEEE 802.3af (PoE) standard. This allows users to mix and match up to four PoE and P0E+ powered devices (PDs). It incorporates older recognition and classification schemes as well as the new ones for PoE+.