The LTC4266 is suitable for a wide variety of PSE applications, including next-generation switches, routers, hubs and midspans. Users will appreciate the extremely low power dissipation which makes thermal design significantly easier than when designing with PSEs that integrate more fragile, normally higher RDS(ON), MOSFETs. Up to four independent PSE channels are available. IEEE 802.3at powered devices (PDs) can request up to 25.5W of power by responding to 2-event classification from the LTC4266, confirming that the PD is indeed a high power device. PD discovery is accomplished using a proprietary dual-mode, four point detection mechanism that ensures the best immunity from false PD detection. Advanced power management also includes prioritized fast shutdown, 14.5-bit per-port voltage and current readback, 8-bit programmable current limits and 7-bit programmable overload current limits. A 1MHz I2C interface allows a host controller to digitally configure the IC or query port readings.
The LTC4266 is offered in commercial and industrial temperature grades, and is available in RoHS-compliant 5mm x 7mm QFN-38 or SSOP-36 packages.