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TPS51200: Are there any pull-down resistors configured on the EN pin inside

Rhea Gao
Expert 2580 points
Part Number: TPS51200

Hi,

May I ask whether TI's TPS51200 and TPS73501 power supply chips are equipped with some pull-down resistors inside the EN pin?

Generally, the PG of the previous sequential power supply is used by the customer to enable the next sequential power supply chip. Usually, the PG of the previous sequential power supply requires a pull-up resistor. If there are some pull-up resistors on the EN pin inside the chip, it may have some impact on the use.

The customer did not find a clear explanation on the functional block diagram of these two chips.

Thanks~

  • 0
    TI__Mastermind 21935 points

    Hi Rhea,

    The EN input has a leakage current of +/-1uA according to the below spec (click to enlarge):

    There's no mention of any internal pull-up or pull-down resistors on the EN pin. Usually, a PGOOD pin will operate as an open-drain output with a pull-up resistor. This would mean that the connected EN pin input is either pulled high by the PGOOD pull-up source or discharged to GND by the open-drain FET when PGOOD is de-asserted.

    I do not support the TPS73501 but there's a good chance it works the same way with the EN pin. Check the EN pin leakage specs to see what kind of current you can expect on these pins.

    The TPS51200 should have no issue using the PGOOD of a previous device for its enable signal.

    Regards,

    James