AGND for Parallel LTC3310S

/When using two LTC3310S regulator, is the AGND shared between the master and the slave regulator or does the master receive its own separate AGND and the slave its own AGND?

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  • +1
    •  Analog Employees 
    on Jun 12, 2020 1:24 PM

    AGND does need to connect between the master and slaves because it is the return to the shared ITH node. AGND and ITH traces should be run from master to slaves closely coupled together for better noise immunity. Each slave should also use it's own local AGND area to connect the RT phase network and any local ITH capacitors. The SSTT slave pin(s) can float or be used to measure the temperature of the slave ICs. 

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  • +1
    •  Analog Employees 
    on Jun 12, 2020 1:24 PM

    AGND does need to connect between the master and slaves because it is the return to the shared ITH node. AGND and ITH traces should be run from master to slaves closely coupled together for better noise immunity. Each slave should also use it's own local AGND area to connect the RT phase network and any local ITH capacitors. The SSTT slave pin(s) can float or be used to measure the temperature of the slave ICs. 

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