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TPS25221: Revers current blocking

d_zero
Genius 4765 points
Part Number: TPS25221
Other Parts Discussed in Thread: TPS2553D, TVS0500

Dear *,

can you tell what is the difference between TPS25221 Reverse Current Blocking and TPS2553D Reverse Input-Output Voltage Protection ?

which device would you recommend for DFP port for USB HUB?

Best Regards,

David.

  • 0
    TI__Mastermind 18031 points

    Hi David,

    For both parts, as IC disabled, both of them can block the reverse current.

    As IC powered, TPS2553D can also block the reverse current but the response time is 5ms.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.

  • 0 in reply to Ziv Zhang
    Genius 4765 points

    Hi Ziv,

    which one would you recommend for a ne hub design?

    1)

    also i have a question regarding ESD protection of a VBUS (DFP port)

    does it make sense to do this kind of protection with TVS0500 and ferrite bead ( see picture below) because there is a 120uF at output ?

    if yes i noticed one thing that Vc of TVS0500 is around 9V and ABS max of OUT ( pin 6 DBV package) is 6V, is there a USB switch that has larger rating for OUT pin?

    2) 

    in the DS of load switches (TPS25221  and TPS2553D)  the output cap 120uF is located at the OUT pin but in some application notes like in below the bulk cap is located before the load switch, which one is correct?

    Best Regards,

    David.

  • 0 in reply to d_zero
    TI__Mastermind 18031 points

    1) If the TVS VC is around 9V, I think it doesn't work for ESD protection. Don't have larger rate.

    2) For input cap, at least 10uF+0.1uF. For output cap, also at least 10uF+0.1uF.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.

  • 0 in reply to Ziv Zhang
    Genius 4765 points

    Hi Ziv,

    what is then recommended ESD protection of the OUT pin (connector VBUS ) from TPS25221  and TPS2553D when VBUS is source?

    Br,

    David.

  • 0 in reply to d_zero
    TI__Mastermind 18031 points

    Don't need ESD protection as it integrates the function. But the output cap need to be at least 10uF+0.1uF.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.