Power

Power sourcing equipment controller delivers up to 71.3W

25th June 2018
Lanna Deamer
0

Analog Devices has announced the Power by Linear LTC4291/LTC4292 isolated four port Power Sourcing Equipment (PSE) controller chipset designed for use in IEEE 802.3bt (PoE++) Power over Ethernet (PoE) systems. The LTC4291/LTC4292 provides four independent PSE ports comprised of two channels each, ensuring fully compliant support for the next generation of IEEE 802.3bt Powered Devices (PDs).

The LTC4291 includes a digital interface to the PSE host, while the LTC4292 implements the high voltage Ethernet power interface. The two ICs intercommunicate using an inexpensive Ethernet transformer. 

The transformer-isolated communication protocol replaces up to six expensive opto-couplers and a complex isolated 3.3V supply used in traditional designs, resulting in significant BOM cost savings and a more robust and easy to manufacture design. 

The LTC4291/LTC4292 chipset operates seamlessly with compliant 802.3bt PD controllers, the LT4294 or LT4295, forming complete end-to-end PoE++, PoE+ and PoE solutions. Up to 71.3W of power can be delivered to single-signature or dual-signature PDs. Users will appreciate the robustness of the 80V pins.

PD discovery is accomplished using a multipoint voltage and current detection mechanism, ensuring the best immunity from false PD detection. Advanced power management includes Autoclass support, prioritised fast shutdown, 14-bit per-port power and current readback, 8-bit programmable power limits and 7-bit programmable overload current limits.

Systems can be updated with field-upgradable firmware.  A 1MHz I2C interface allows a host controller to digitally configure the chipset or query port status. Power management “C” demonstration libraries are also available to reduce NRE and improve time to market.

The LTC4291/LTC4292 chipset is offered in the industrial temperature range. The LTC4291 digital controller is in a RoHS-compliant 24-pin 4x4mm QFN package, while the LTC4292 analogue controller is in a 40-pin 6x6mm QFN package. The LTC4291/LTC4292 is Analog Devices’ first 802.3bt PSE controller and provides an upgrade path from the popular LTC4266 4-port 802.3at PSE controller.

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