• LTC4291-1/LTC4292 about power recovery after power cut off


    My customer is considering PoE LTC4291-1 and LTC4292 and I got questions.

    It is assumed that power is supplied to the LTC4291-1 but LTC4992 power is not supplied (cut off) and after that power is recovery.
    In this case, what kind of operation does…

  • the LTC4292 Issue


    i's working on a device that should have two ports PoE Type 2 (IEEE Compliant Output).

    I would like to use the LTC4292 PSE  for my design but I'm confused if could be the right one.

    does this IC must be connected to 4 PoE or we can connect…

  • RE: PoE Injector Port Power

    The LTC4292/LTC4291 solution will support dual-signature and signal-signature PDs.  For your single-signature 71W power level, set the LTC4292/LTC4291 PM1 and PM0 pins logic high.

    SELV stands for Safety Extra Low Voltage.  One requirement of SELV is limiting…

  • RE: IEEE 802.3bt Backward Compatibility with market in general

    Yes the 802.3bt PSE & PD. LTC4291/LTC4292 and LT4321.

  • LTC4291-1 & LTC4292 Issue


    We are using LTC4291-1 and LTC4292 in our PSE application. While connecting the the PD through LAN I don't get output. Gate pin stays low always. Below waveform (10x) is the one I'm getting on OUT1A when connecting PD. When PD is not connected…

  • LTSpice model for LTC4292


    I would like to simulate the LTC4292 PSE controller for my project, but I couldn't find the model for it (.lib).

    what should I do to add it to my library ?

    thank you,

    best regards,


  • LTC4292-1/LTC4291 Power supply board

    Hi , 

    Would like to know if there is a power supply evaluation board to evaluate LTC4292-1/LTC4291.

    We are planning to use bt 71.3E x 4 port which adds to 200 + watts.

    Please let me know if there any Power supply board from analog device to evalute all…

  • RE: 4PVALID Working for 802.3af and 802.3at

    IEEE 802.3af and 802.3at compliant PDs are both single signature PDs and present a valid signature on both pairsets.  If operating in Auto mode, or controlled in Semi-auto mode, the LTC4291-4/LTC4292 chipset will detect, classify and power either of these…

  • RE: Enable power using LTC4291 -1

    LTC4291-1 / LTC4292 can run autonomously by tying the AUTO pin high. With AUTO pin high during startup or reset, the PSE will operate in Auto mode. Each port will detect and classify repeatedly until a valid PD is discovered. LTC4291-1 / LTC4292 will t…

  • LTC4291-1/LTC4292 doesn't get the output power

    Hi ,

    My question seems LTC4291-1 doesn't work well.

    So I check the LTC4291-1 whether it is fail or ok by I2C read back. 

    I have tried to read the register by MCU I2C ,but it shows I2C not ack.(Please see the attached picture)

    I have tried auto pin…