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About operation of TPS22908 and TPS22922.

Satoshi
Guru 19485 points
Other Parts Discussed in Thread: TPS22908, TPS22922, TPS22964C

Please let me know two points below about TPS22908 and TPS22922.

- When ON signal is Hi-z, which logic does it become?
Is the exterior Pull down for protection required?

- If input voltage falls while ON signal has been ON (H), what will happen about a Discharge function?
(I think that the Discharge operates when ON signal is set to L.)

Thank you for your consideration.

  • 0
    TI__Expert 5275 points

    Hi Satoshi,

    For both parts, it is not recommended to leave the ON input signal floating per the Pin Descriptions/Terminal Functions.

     

    As for your second question, neither of these devices offer reverse current protection, so in the case where the input voltage falls while the ON signal is high, current will flow backward through the part effectively discharging the output to whatever is pulling down the intput.

     

    If you need reverse current protection AND want to be able to discarge the output when the input falls below the output, then consider the TPS22964C.  It offers both reverse current protection and quick output discharge.

     

    Let me know if you have any other questions.

     

    Best Regards,

    Adam Hoover

    DLS Applications Team