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Questions of TPS27081A

Takahiro Nishizawa
Genius 5575 points
Other Parts Discussed in Thread: TPS27081A, TPS22918

I have questions about TPS27081A.

Question 1.

 - Can the IC operate Q1 by inputting LOW to R1/C1 pin regardless of status of EN pin? 

Question 2.

 - When Q1 is in the ON state, can this IC supply current bidirectionally?

   We try to set battery on the input side.

   Current flows bidirectionally with charging and discharge.

Best regards,

Takahiro Nishizawa

  • 0
    TI__Genius 15760 points

    Hi Takahiro,

    This device is pretty simple; it is essentially a PMOS + NMOS controller. By pulling the voltage on R1/C1 down, you can force the PMOS to turn on regardless of the enable pin voltage.

    Because the device does not have reverse current blocking, it can be used for bidirectional applications when turned on. When turned off, the device will block current from VIN to VOUT, but not from VOUT to VIN.

    If you are looking for a more integrated device with better performance and simple switching logic, you can take a look at the TPS22918. We also have other load switches that can save space depending on your manufacturing capabilities (CSP, QFN, etc.). Let me know if you would like any additional information.

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Genius 5575 points
    Thank you for your help!

    Are the following understandings correct?

    When Low signal inputs to R1/C1 pin, this IC can turn ON / OFF Q1 regardless EN pin status.
    (We connect Nch-FET toR1/C1 pin.)

    Best regards,


    Takahiro Nishizawa
  • 0 in reply to Takahiro Nishizawa
    TI__Genius 15760 points

    Hi Takahiro,

    That is correct. Out of curiosity, why are you trying to bypass the NMOS?

    Thanks,

    Alek Kaknevicius