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Sequence of TPS65261

Takahiro Nishizawa
Genius 5575 points
Other Parts Discussed in Thread: TPS65261

I have questions about TPS65261.

Please check the attached document.

We want to set sequence.

1.1V→1.5V→2.5V→1.8V→3.3V

PG of TPS65261① connects to EN3 pin of TPS65261②.

Question 1.

Are there any problems with this configuration?

Question 2.

We do not use BUCK3 of TPS65261②.

Is BUCK3 pin floating or connected to GND?

Question 3.

If we have problems about this configuration,

Please tell us the suitable circuit.

Best regards,

Takahiro Nishizawa

TPS65261.pdf

  • 0
    TI__Genius 9550 points
    hi,
    I am going to look into this and get back to you after Chinese New Year Vacation- Feb. 21.
  • 0
    TI__Mastermind 19080 points
    Hi,

    It seems that you are trying to use the Automotic Power Sequencing. If you are doing that, below is the answer:

    Q1: No problem. The power sequence can be achieved by using first TPS65261's PG to enable second part.

    Q2: For unused Buck3, please follow this below,

    Connect FB3 to COMP3;

    Connect COMP3 to GND via 10k and 1nF (series);

    SS3 floating;

    PVIN3/LX3/BST3 floating.

    Q3: No problem.

    If there is any further question, please let me know. Thanks!

    Best regards,
    Sam Zhang
  • 0 in reply to Sam(MPAA) Zhang
    TI__Genius 15135 points
    Additional comments:

    Q1:
    Please connect C1 between EN1 and GND for TPS65261① .
    Please connect C2 between EN2 and GND for TPS65261① .
    Please connect C3 between EN3 and GND for TPS65261① .
    Please connect C4 between EN1 and GND for TPS65261② .
    Please connect C5 between EN2 and GND for TPS65261② .
    And set C1 < C2 < C3 < C4 < C5, which can achieve 1.1V→1.5V→2.5V→1.8V→3.3V sequence.

    Q2:
    If BUCK3 is not used, it is not needed to connect PG to EN3, just connect EN3 pin to GND, and the related pin of BUCK3 can be floating.