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LP3878-ADJ: clarification on Vsd (SHUTDOWN\ input voltage) specification

AnBer
Mastermind 28890 points
Part Number: LP3878-ADJ

Team,

-Could you please confirm that the SHUTDOWN\ pin is specified for the same condition as Vin?

-The EVM is showing a 51k resistor between Vin and SHUTDOWN\. What is the reason to use a resistor?
On the Webench generated schematics SHUTDOWN\. is directly tight to Vin.

Thanks in advance,

Anthony

  • 0
    TI__Mastermind 23361 points

    Hi Anthony,

    /Shutdown pin needs to be lower than Vin and no resistors are needed between Vin and /Shutdown. Some old designs tend to have the resistor which will giving the flexibility on the PCB layout if /Shutdown pin needs to be connected to something other than tied to Vin. But again, you don't have to have the resistor. 

    Regards, 
    Jason Song