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TPS65311-Q1: Start up sequence on non-permanent power supply

Kuramochi Tadahiko
Guru 28715 points
Part Number: TPS65311-Q1

Hi,

I received the following question from my customer.

Theyr requires that ramp up doesn't start after non-permanent supply power starts up.

Except for sending LPM0 command via SPI and occurring any error, is there any way to realize above?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 30260 points
    TQ,

    I assigned this post to an engineer who is familiar with the TPS65311-Q1 device and will be able to answer your question or ask follow-up questions to understand your question more clearly.
  • 0 in reply to Brian Berner
    TI__Expert 8730 points
    Hi Kuramochi-san,

    TPS65311 powers up as soon as VBAT/VIN rises above POR threshold and we do not have any control on this. If they want to delay the ramp of VBUCK1 by few milliseconds, may be they can increase the capacitor on VT pin slightly to delay the ramp up. If they increase the capacitor on VT pin, voltage on VT pin ramps up slowly reaching the VT threshold can be delayed slightly.

    Else, they will have to use some kind of external logic to control the GPFET (if they use it).

    Regards,

    Murthy
  • 0 in reply to Krishnamurthy Hegde
    Guru 28715 points
    Murthy-san,

    Thank you for your answer.

    Please let confirm follows.

    > we do not have any control on this.
    I'm understanding that sending LPM0 command via SPI or occurring any error is valid as question.
    Is it correct?

    Best regards,
    Kuramochi
  • 0 in reply to Kuramochi Tadahiko
    TI__Expert 8730 points

    Hi Kuramochi-san,

    Device can be put in LPM0 mode using SPI and WAKE (low to high signal) can be used to enable the device again. But when the supply is ramping up for the first time, device turns on as soon as POR threshold is reached and WAKE does not have any control during first time battery ramp up.

    Regards,

    Murthy