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TUSB1210 - About how to use VDD33 pin

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Guru 21045 points
Other Parts Discussed in Thread: TUSB1210

I think as follows.

Is my understanding right?

 

<When VDD33 is shorted to VBAT externally>

TUSB1210 does not use internal LDO and uses the supply voltage from VBAT.

Efficiency is improved if I use DC-DC for VBAT supply.

However, does TUSB1210 malfunction when The output ripple of DC-DC is big?

 

<When VDD33 is supplied internally>

An electrical characteristic of Table5-2 is guaranteed by using LDO in TUSB1210.

However, the efficiency worsens than I use the external DC-DC.

  • 0
    Guru 21045 points

    Hi,

    Please let me ask one more question.

    When my customer uses external DC-DC , how much is the necessary output precision?

    If output precision is less than +/-5%, is it acceptable?

    * VDD33 is shorted to VBAT externally

     

    I'll be grateful if you can reply to me.

     

    Regards,

    kanemaru

  • 0 in reply to Hide
    Guru 21045 points

    Hi,

     

    I’m sorry.I have add question.

    When I don't use VDD33 LDO (When VDD33 is shorted to VBAT externally),

    is the value of VUSB3V3_VSEL good as Default(“011”)?

     

    <guess>

    I think that it is "VUSB3V3_VSEL = don't care".

    so, I think that the value of VUSB3V3_VSEL  is good as Default(“011”).

     

    my customer wants an answer as soon as possible.

    I’m sorry to trouble you, but I would really appreciate it if you could confirm.

     

    Regards,

    kanemaru

  • 0 in reply to Hide
    Guru 21045 points

    Hi,

    I'm sorry to trouble you, but give me advice.

    Regards,

    kanemaru

  • 0
    TI__Genius 11280 points
    Hello Kanemaru,

    We don't have any test supporting your questions. The customer can choose to use the internal LDO depending of the specific application.

    Regards