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Ethernet Extender - Linear Technology Introduces PoE Controllers
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August 22, 2011

Linear Technology Introduces PoE Controllers

By Anuradha Shukla
TMCnet Contributor


Linear Technology has announced the launch of the LTC4266A and LTC4274A.

These four-port and single-port Power over Ethernet (PoE) controllers for power sourcing equipment (PSE) can deliver up to 90 W of power to devices (PDs).

Linear Technology notes that the current IEEE (News - Alert) standard, 802.3at limits the maximum available power to PDs to 25.5 W.

The applications available in the market demand higher power levels and the LTC4266A and LTC4274A have been designed to address this higher-power PoE market.

These controllers use Linear’s LTPoE++ signalling scheme to mutually identify and provide PDs with up to 90 W of power. Also, these products ensures backward compatibility and interoperability with equipment based on the existing IEEE PoE standard.

Because Linear offers high-power versions covering 35 W, 45 W, 70 W and 90 W power levels, discrete components and magnetics can be sized accordingly.

The company has made available low-power 13 W versions, the LTC4266C and LTC4274C, for fully automatic Type 1 PoE systems.

Linear claims that both its newly released products – 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.

Both the LTC4266A and LTC4274A include very low power dissipation across low-RDS(ON (News - Alert)) MOSFETs and sense resistors (0,34 Ω total per port).

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Anuradha Shukla is a contributing editor for TMCnet. To read more of her articles, please visit her columnist page.

Edited by John Lahtinen

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