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TPS25751: Questions about TPS25751D device behavior and configuration

Hiroki Sagara
Prodigy 20 points
Part Number: TPS25751
Other Parts Discussed in Thread: TPS55289-Q1

Hello TI Team,

I am currently evaluating the TPS25751D for use as a source-only PD controller in my design, and I would like to clarify several points regarding its startup behavior and configuration.
Could you please help confirm the following items?

Q1. CC1/CC2 pin behavior during startup
Please describe the state transitions of the CC1 and CC2 pins during startup.
Specifically, what is the condition of the CC lines during SafeMode startup and after initialization?
(For example, are they pulled high when VIN_3V3 is powered up, or only after the firmware is loaded from EEPROM?)

Q2. Device Configuration
According to Table 8-6 (“Device Configuration”), what operating mode will the device enter if ADCIN1 and ADCIN2 are set to a combination that is not listed (e.g., AD1 = 0, AD2 = 1)?
Also, which I²C target address from Table 8-5 will apply in that case?

image.png

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Q3. PP5V and PPHV power rail ramp-up time
Are there any specifications or recommendations for the ramp-up time of the PP5V and PPHV power rails?

Q4. Power ON/OFF sequence
Are there any required or recommended power-on or power-off sequencing conditions?

Q5. GPIO pull-up before LDO1.5V startup
Is it acceptable to pull up a GPIO line to 3.3 V before the LDO1.5V rail becomes active?

Thank you very much for your support.
Best regards,

  • 0
    TI__Mastermind 31182 points

    Hi Hiroki, 

    Thank you for reaching out!

    A couple questions: 

    1- What is the end-product you are designing?

    2- What are the sourcing capabilities of your device (i.e. power profiles)?

    3- Is the TPS25751 being paired with an external DCDC?

    Best Regards, 

    Aya Khedr

  • 0 in reply to Aya Khedr
    Prodigy 20 points

    Hi Aya,

    Thank you for your response.

    1. The end product is a mobile battery charger.

    2. The source power profiles are 20V/1.5A, 15V/2.0A, 12V/2.5A, 9V/3A, and 5V/3A.

    3. The PPHV rail will be powered by a TPS55289-Q1 device.
      I will also share a simple block diagram for reference.

    Best regards,
    Hiroki

  • 0 in reply to Hiroki Sagara
    TI__Mastermind 31182 points

    Hi Hiroki, 

    Thank you for sharing the block diagram. I will get back to you with detailed responses by end of week. 

    Best Regards, 

    Aya Khedr