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TPS25910 Quiescent Current when turned OFF

Juan Medrano83
Intellectual 535 points
Other Parts Discussed in Thread: TPS25910

Hi everyone,

I wanted to confirm if a parameter in the TPS25910 datasheet SLUSAR6D, is correct.

It states, in page 4, the IN pin Bias Current of 2.5mA(typ) and 4mA(max) when turned OFF (EN pin is active low). Is this correct, a turned OFF current of 2.5mA typical?! In the mA order? I would expect something around tens of uA. That looks really strangely high, even more when compared to most other similar devices with similar characteristcs (eFuses).

Thanks for your confirmation.

  • 0
    TI__Genius 15770 points

    Hi Juan,

    I have contacted the appropriate engineer and he will get back to you soon.

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Intellectual 535 points

    Thanks Alek. I have another question regarding this device: Page 7, of the datasheet SLUSAR6D, states for the EN pin the following "Because high impedance pullup and or down resistors are used to reduce current draw, any external FET controlling this pin must be low leakage."

    What does exactly "low leakage" means? Maybe it is a newbie question but I am not sure what is the maximum input current or the minimum output impedance of the driver should be to drive the EN pin. Actually,  the device is being driven by a BJT inverter (using an mmbt3904) with some resistors:

    So I would like your guidance as to how to design the driver circuit for this pin and to now if the current driver would work or how should it be modified.

    Thanks for your fast response.

  • 0
    TI__Intellectual 2980 points
    Hello Juan,
    That is true, this is an old device and bias current is 2.5mA(typ) with /EN= High.
    Please help us understand you application, we probably will suggest the most suitable part to you.
    Best Regards
    Dinesh
  • 0 in reply to Dinesh Kumar6
    Intellectual 535 points
    Hi Dinesh,

    Thanks for your reply, in the other thread I requested your email to share with you schematic and other design files. I will appreciate if you share it with me to continue talking.

    Do you have any comments regarding the question I posted above about the driver circuit for the ENABLE pin?

    Thanks for your reply back.
  • 0 in reply to Juan Medrano83
    TI__Intellectual 2980 points
    Hello Juan,
    I am sorry , I missed your other question in the discussion,
    /EN is pulled to VIN by a 10-MΩ resistor, pulled to GND by 16.8 MΩ, and this was basically done to reduce current draw in the IC,
    Now if you use any external FET/BJT circuit connected which has lower impedance (in Off state ), that may give undesirable lower voltage at /EN pin and that it may be treated as the device disable input , which will turn off the device.

    Now to comment your circuit , since you have used strong pull up (R34) and pull down(R37), with external BJT, you should be fine with it, I mean that will not give any undesirable input to the /EN pin.

    Best Regards
    Dinesh