• LT8640 Data sheet question

    On the first page of the LT8640 data sheet(s) there is a table describing all of the part variants. The far column is labeled INTERNAL CAPS. What are the internal caps? Thanks for any help.

  • What is the difference between the LT8640S & LT8640S-2 ?

    What is the difference between the LT8640S & LT8640S-2 ?

    Which products are newer?



  • RE: LT8640S Average output voltage tolerance

    Hi T-yoshi,

    I agree. Most relevant to compute for AVE output voltage should be feedback resistors value tolerance and reference voltage tolerance.

  • LT8640S

    I have a design with two LT8640S devices.  They are set to generate 12V from a 24V input.  One is used to power devices on another board.  The other powers on-board devices.  The LT8640S for the off-board devices works fine and generates 12V.  The LT8640S…

  • LT8640 Thermal Resistance Values

    The datasheet for LT8640/LT8640-1 lists theta_JC(PAD) = 12 C/W.

    First, I would like to confirm that this represents the junction-to-board thermal resistance. Typically, JC denotes junction-to-case, however, in this case it calls out the PAD which makes…

  • PCB file for LT8640

    Hello, can you confirm that PCB file for LT8640 works? Because I cannot run it with Altium Designer. I need this file for my thesis project. I would be happy if you can help me on it.

  • LT8640S and LT8643S


    I checked data sheets of LT8640S and LT8643S, both having same footprints except for One Pin(PIN 22). Please suggest the changes i have to make in the schematic to have common footprint



  • LT8302+LT8640S simualtion


    Our customer will use LT8302 fly back and LT8640S.

    (24V-> 5.5V by LT8302 and 5.5V-Vf-> 3.3V about 4A by LT8640S.

    (Refer to attached slide 1)

    He simulated this design by LTspice.

    (Result is attached slide 2)


    When LT8302 SW current reaches…

  • LT8640 not working


    I've designed a board with the LT8640.

    The switcher is not working and the IntVcc pin is stuck at 2V instead of the specced >3V.

    The input voltages are ok and the switching terminal is silent and doesn't do anything.

    Where could I start…

  • LT8640S and LT1764A Reliability

    Hi all,

    I'm doing reliability analysis (according to Telcordia SR332 Issue 3 method).

    Fit/MTBF values given by Analog here follow another standard and are not comparable to Telcordia values.

    I need MTBF/FIT value (according to Telcordia) for this…