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TPSM63606: Behaviour under voltage inputs below desired V_out

Mat Z
Prodigy 10 points

Part Number: TPSM63606

Tool/software:

Hi. We've been using some TPSM63606 parts for reducing input voltage from typically 28V to output either 12V, 5V or 3V3 rails. However we have one application where we would actually need to use it with a 5V input, possibly even lower. How would it work in this case, for example if we still wanted the same output rails? For 5v in and out, would the module simply bypass or be non-functional? And of course I presume with lower in it would not work as it's a buck module.

If the TPSM63606 is no longer suitable, could you recommend any alternatives for this flexible application? Typically our systems are max 1-2W (though sometimes higher), and we would particularly like any modules that are well-suited to a cross-strapped architecture for redundancy.

Many thanks.

  • 0
    TI__Mastermind 25890 points

    Hi Mat,

    I've assigned an expert to this post.

    Thanks,

    Andrew

  • 0
    TI__Genius 14510 points

    Hello Many, 

    All converter devices have a minimum drop out voltage which must be satisfied for the device to properly regulate. In the case of this device the dropout voltage is 5.8V, meaning that the input must be greater than 5.8V for proper operation. We cannot guarantee what the output voltage will be at a 5V input for example. In the case of your design since the input voltage is equal to the desired output voltage, would it be possible to implement some sort of switch with external components. 

    Regards, 

    Oscar Ambriz