PoE Power Sourcing Equipment (PSE)

Linear Technology’s Power Sourcing Equipment (PSE) controllers support multiple power levels of Power over Ethernet: IEEE PoE (13W), IEEE PoE+ (25.5W) and Linear Technology LTPoE++ (up to 90W) standard. PSE controllers are ultimately responsible for detecting and classifying Powered Devices (PDs), as well as sourcing the right amount of power to PDs over the Ethernet cables. Our latest generation PSE controllers are IEEE compliant, use 0.1Ω sense resistors to lower power dissipation, and use a high reliability 4-point PD detection scheme to eliminate false PD detections. External MOSFETs, a scalable cable discharge protection scheme, an 80V abs max rating on all analog pins, and overtemperature protection all ensure robust operation. The low EMI 8-port LTC4290/71 and 12-port LTC4270/71 PSE controller chipsets reduce total solution costs by replacing multiple high speed optocouplers and an isolated supply with inexpensive Ethernet transformers.  The single port LTC4279 PSE controller provides a simple, off-the-shelf, solution for PDs needing up to 123W.

Linear Technology’s LTPoE++ is a proprietary high power standard that uses a single CAT-5e Ethernet cable to provide four different PD power levels: 38.7W, 52.7W, 70W and 90W. These LTPoE++ power levels allow external components in the power path, such as transformers and DC/DC converters, to be sized accordingly so designs can be optimized both in terms of cost and efficiency. LTPoE++ is interoperable and backward compatible with both IEEE 802.af PoE and 802.3at PoE+ standards, so LTPoE++, PoE+ and PoE devices can all be mixed and matched. LTPoE++ has a simple plug-n-play nature, so PSE and PD controllers can seamlessly connect, classify and communicate with one another. With a complete end-to-end solution that requires no additional code, LTPoE++ PSE and PD controllers can power a wide variety of power hungry applications, including heated outdoor surveillance cameras, microwave dishes and pico cells.

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