Newly introduced by Linear Technology are the LTC4266A and LTC4274A, four-port and single-port Power over Ethernet (PoE) controllers for power sourcing equipment (PSE), delivering up to 90 W of power to powered devices (PDs).
The current IEEE standard, 802.3at (also known as PoE+), limits the maximum available power to PDs to 25,5 W. By the time the standard was ratified in 2009, applications were already demanding higher power levels. The LTC4266A and LTC4274A address this higher-power PoE market using Linear’s LTPoE++ signalling 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. 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. Capabilities of the LTC4266A and LTC4274A include very low power dissipation across low-RDS(ON) MOSFETs and sense resistors (0,34 Ω total per port).
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. Very high reliability PD discovery is accomplished using a proprietary dual-mode, four-point detection mechanism that ensures immunity from false PD detection.
Linear’s PSE controllers offer advanced power management that includes prioritised 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.
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