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TPSM86838: Do the SW pins need to be connected to each other (TPSM86838 and TPSM86638)?

Isaac Kreft
Prodigy 50 points
Part Number: TPSM86838
Other Parts Discussed in Thread: TPSM86638,

Tool/software:

The datasheet states about the two SW pins: 

Switching node. Do not place any external component on this pin or connect to any signal. The amount of copper placed on this pin must be kept to a minimum to prevent issues with noise and EMI.

Later in the datasheet, as well as the datasheet for the eval module, the two SW pins are shown connected to each other, but nothing else:

Must these pins be connected to each other? Does it make a difference? Does this answer translate to the TPSM86638? Are these two parts pin-compatible otherwise?

  • 0
    TI__Mastermind 27466 points

    Hi Isaac

    The two sw pins are connected together in inner circuit, Also recommend connect the 2 sw pins together on the pcb since this helps reduce the parasitic impedance on the trace&pin, and is helpful to achieve better efficiency and thermal performance. 

    The SW copper plane is a high dv/dt node, and is antenna that make EMI performance worse, from this aspect we suggest keep SW plane smaller. 

    Wide& short SW trace is recommended.

    Thanks and best regards.

  • +1 in reply to Gui He
    Prodigy 50 points

    Thanks for the reply. To be clear, aside from the EMI, efficiency, and thermals, will the device function normally with those two SW pins unconnected? Also, is this answer the same for both TPSM86838 and TPSM86638?

  • 0 in reply to Isaac Kreft
    TI__Mastermind 27466 points

    Hi Isaac

    Yes it should be able to function normally unconnected, same for TPSM86838 and TPSM86638.

    Thanks and best regards.