LTM4675 Vout sense when parallel

When using the LTM4675 part with the outputs combined for a single 18A capable output, do both Vout sense pins need to be connected?  Or can just Vout0 or 1 be connected to the load for sensing?  Does it make a difference if the part will only be resistor pin set and not use the programming interface? 

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    •  Analog Employees 
    on Mar 5, 2020 4:05 PM

    Hello, 

    LTM4675 can be used with resistor pin set and it will work well without using programming interface.

    To have parallel operation, Vout sense pins are required to be all tied together and then position it at desired VOUT sense location.

    Thanks. 

  • Thank you Haihua. 

    When you say "Vout sense pins are required to be all tied together and then position it at desired VOUT sense location.", I have some follow up questions:

    1.  Does this mean I need to have the sense pins connected together at the load? 

    2.  Is it ok to connect them together close to the part and then route a single pair of combined sense pins to the load?

    3.  The Vout1 sense- pin is really the SGND pin, is there anything special that needs to be considered for the shared case?  Or do I just connected SGND to local GND near the part as usual per the datasheet?

    Mark

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  • Thank you Haihua. 

    When you say "Vout sense pins are required to be all tied together and then position it at desired VOUT sense location.", I have some follow up questions:

    1.  Does this mean I need to have the sense pins connected together at the load? 

    2.  Is it ok to connect them together close to the part and then route a single pair of combined sense pins to the load?

    3.  The Vout1 sense- pin is really the SGND pin, is there anything special that needs to be considered for the shared case?  Or do I just connected SGND to local GND near the part as usual per the datasheet?

    Mark

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