Quad and single LTPoE++ PSE controllers deliver up to 90-W

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By eeNews Europe

The LTC4266A and LTC4274A address the higher power PoE market using Linear’s LTPoE++ signaling scheme to mutually identify and provide PDs with up to 90 W of power, while ensuring backward compatibility and interoperability with equipment based on the existing IEEE PoE standard.

Linear offers high power versions covering 35 W, 45 W, 70 W and 90 W power levels, so that discrete components and magnetics can be sized accordingly, minimizing total solution costs. Low power 13 W  versions, the LTC4266C and LTC4274C, are also now available for fully automatic Type 1 PoE systems.

The LTC4266A and LTC4274A enable a new generation of high power PoE applications, including long range wireless access points (WAP), thin clients and heated surveillance cameras.

Key benefits include low power dissipation across low RDS(ON) MOSFETs and sense resistors (0.34 Ohm total per port). Linear Technology LTPoE++ PDs can request up to 90 W of power by responding to a proprietary classification mechanism, confirming that the PD is indeed a high power LTPoE++ compliant device.

High reliability PD discovery is accomplished using a proprietary dual-mode, four point detection mechanism that ensures the best immunity from false PD detection.

Linear Technology PSE controllers offer advanced power management that includes prioritized fast shutdown, accurate 14.5-bit per-port voltage and current read back, 8-bit programmable current limits and 7-bit programmable overload current limits. A 1 MHz I²C interface allows a host controller to digitally configure the IC or to query port readings. Firmware is conveniently field upgradable.

The LTC4266A/C and LTC4274A/C offer guaranteed specifications for operation in industrial environments, and are available in a RoHS-compliant 5 mm x 7 mm QFN-38 package. The LTC4266A/C and LTC4274A/C are priced at $5.00 and $4.50 each, respectively in 1,000 piece quantities and are now available in production quantities. Application circuits for both LTPoE++ PSE and PD controllers are available today from Linear Technology.

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