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TPS544B20: what's the behavior when CNTL floating ?

Mark Chen52
Expert 5685 points
Part Number: TPS544B20

Hi All,

For the TPS544B20 default setting, power up was control by CNTL pin, If under default setting of IC and let CNTL floating, I think CNTL pin will be zero voltage, since which is input pin. does anyone  could help to double confirm it? thank you.

BR,

Mark Chen

  • 0
    TI__Prodigy 240 points

    Hi Mark,

    It is not recommend leave the CNTL pin floating.  The reason being is that the device (TPS544B20), would be in an undetermined state with the CNTL pin left floating.

    For reference, the recommended voltage for the CNTL signal is as follows:

    The minimum input high threshold for the CNTL signal is 2.1 V, and the maximum input low threshold for the CNTL signal is 0.8 V.  The CNTL pin can be configured as either active high or active low (inverted) logic.  The max voltage for the CNTL signal is 7 V.

    Thanks,

    Ryan

  • 0 in reply to Ryan Wallace
    TI__Expert 5685 points
    thanks Ryan,

    I was double confirm the CNTL pin on EVM, whatever I set to CONTROL PIN ONLY or operation only, the CNTL always keep 6.5V, I think the CNTL pin was pull high to BP6 of internal , right?
    can I use external bias voltage to CNTL to control enable converter what I want it?

    thank you,
    Mark Chen
  • 0 in reply to Mark Chen52
    TI__Prodigy 240 points
    Hi Mark,

    You are correct, there is an internal current source from BP6 to CNTL of 6.6 uA nominal, 10uA max.

    You can use an external bias voltage to CNTL in order to enable/disable the converter, you just need to be able to pull 10 uA of current below 0.8 V to ensure the part turns off.

    Thanks,