(iTers News) - Linear Technology Corporation introduces the LTC4279 single port Power over Ethernet or PoE controller for power sourcing equipment or PSE, delivering up to 123W of power over CAT-5e cable for power-hungry applications.

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Demand for higher power delivery comes from a widespread set of applications, including LTE picocell base stations, LED signage, security monitoring systems, home automation and machine vision systems. The highly versatile LTC4279 delivers power to a wide variety of powered devices or PDs.

This includes all legacy (<13W), IEEE 802.3at Type 1 (13W) and Type 2 (25.5W) PDs, Linear’s proprietary LTPoE++ (up to 90W), and custom (<123W) PDs.  2-pair and 4-pair output topologies are supported, as well as single-signature and dual-signature architectures.

Resistor-adjustable power selection allows the LTC4279 to be easily configured for multiple sockets, simplifying design and bill of materials.

The LTC4279 provides fully autonomous operation for a wide variety of PSE applications, including endpoints and midspan power injectors.

A low power sense resistor and external MOSFET simplify thermal design; traditional PSEs utilize less robust MOSFETs with higher RDS(ON).

PD discovery is accomplished using a high reliability 4-point detection mechanism that ensures best-in-class immunity from false PD detection.

The LTC4279 provides a comprehensive set of PD classification mechanisms to enable wide system compatibility.

Robustness is reinforced with classification-dependent current cutoff and limit thresholds, short-circuit protection and ±80V cable surge protection.

The LTC4279 is offered in the industrial temperature grade (–40°C to 85°C) and is available in RoHS-compliant 4mm x 5mm QFN-20 and SO-16 packages.

The LTC4279 is priced starting at $3.45 each in 1,000-piece quantities and is now available in production quantities.

The LTC4279, combined with the LT4275 and LT4276 PD controllers, enable up to 123W end-to-end design.

 

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