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Power Sequencing - .9V USB

Marty Shank
Intellectual 2100 points

Other Parts Discussed in Thread: TPS65001

Can a voltage divider off the 1V CVDDC be generated for the .9V VDD_USB_0P9 or will that violate the sequencing requirements?

  • 0
    TI__Mastermind 25055 points

    Marty,

    The requirement for the USB PHY supply sequencing is 3.3V -> 1.8V -> 0.9V.  As shown in the datasheet, the device power supplies must be sequenced in the following order:
    1. 3.3 V
    2. 1-V AVS
    3. 1-V Constant
    4. 1.8 V
    5. 1.5 V
    6. 0.9 V

    So, using a voltage divider off the 1V CVDDC to generate the .9V for VDD_USB_0P9 would violate the sequencing requirements.

    Regards,
    Marc

  • 0 in reply to MarcPyne
    TI__Mastermind 30975 points

    Hi Marc,

    Customer is looking at the power supply design. There are no info provided for the VDD_USB_0P9 supply. Do we have some info on the max current on VDD_USB_0P9 so that customer can design the supply accordingly?
    Or should the DM8168 EVM power design be used as reference (meaning using the TPS65001 to generate 0V9_A)?

    Thanks in advance,

    Anthony

  • 0 in reply to AnBer
    TI__Mastermind 25055 points

    Hi Anthony,

    The max current on VDD_USB_0P9 is very small (just a few mA) compared to the other power supplies. Hence, it was not included as a separate item.  The latest EVM can be used a reference on this.

    Regards,
    Marc