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TPS3762: Regarding TPS3762D02OVDDFR Usage in Attached Circuit

Conor
Guru 12115 points
Part Number: TPS3762

Tool/software:

Hi,

I am currently considering using the TPS3762D02OVDDFR in the attached circuit configuration.

I have reviewed the datasheet, but I would like to confirm a few points to ensure proper functionality.

  1. For the TPS3762D02OVDDFR, should the SENSE pin be set to 0.8V as calculated in the attached circuit?
  2. If I use a variant with a 5V threshold voltage, such as TPS3762DK0OVDDFR, should the SENSE pin be directly connected to the 5V output of the DC/DC converter?
  3. Regarding operation, does the RESET pin initially go High at the minimum VDD (2.7V) during power-up, and then go Low if the SENSE pin voltage exceeds or falls below the threshold?
  4. What does "OV" represent in the part number TPS3762D02OVDDFR? Does it mean "Over Voltage" detection?
  5. Are there any potential issues with the attached circuit configuration that we should be aware of?
  6. Is any pull-up or pull-down resistor required for the BIST_EN pin in this configuration?

Thanks,

Conor

  • +1
    TI__Mastermind 18710 points

    Hi Conor,

    Please see my answer below.

    1. For the TPS3762D02OVDDFR, should the SENSE pin be set to 0.8V as calculated in the attached circuit? 
      1. The desired threshold of the 5V rail should be set as the .8V output of the voltage divider. 
    2. If I use a variant with a 5V threshold voltage, such as TPS3762DK0OVDDFR, should the SENSE pin be directly connected to the 5V output of the DC/DC converter?
      1. If the nominal rail voltage is 5V, I would recommend using a lower voltage threshold device unless a reset assert is desired at 5V. 
    3. Regarding operation, does the RESET pin initially go High at the minimum VDD (2.7V) during power-up, and then go Low if the SENSE pin voltage exceeds or falls below the threshold?
      1.  At start-up, for the overvotlage monitoring device, if the the monitored rail exceeds the threshold during the reset time delay, the RESET will stay asserted low and will only de-assert high, if the rail stays below the threshold for the duration of tctr.
    4. What does "OV" represent in the part number TPS3762D02OVDDFR? Does it mean "Over Voltage" detection?
      1. yes, OV does stands for overvoltage monitoring device
    5. Are there any potential issues with the attached circuit configuration that we should be aware of?
      1. For the pull-up resistors of the RESET and BIST, I would recommend using a 10kohm. Other than that the schematic looks good.
    6. Is any pull-up or pull-down resistor required for the BIST_EN pin in this configuration?
      1. No requirements. A pull-up or pull-down may be required if MPU GPIO is at unknown state during start-up. 

    Jesse 

  • 0 in reply to Jesse Villanueva
    Guru 12115 points

    Hi Jesse, 

    Thank you for your reply.

    Q1.
    I am reviewing the TPS3762 datasheet and noticed that the specific threshold voltage (VIT) for the "W7 ±7%" setting is not explicitly mentioned. Could you please clarify what baseline threshold voltage the "W7" setting is based on, and provide details about the exact threshold voltage values?

    Q2.
    It's a little hard to determine the detailed model number from the data sheet. For example, what would the model number be if the threshold is 5V, the hysteresis is 10%, and both over/under detection is required? Also, could you tell me about the availability of that model number?

    If you need the answer to the above by email, please contact the email address registered with E2E. We are in a bit of a hurry to decide whether to adopt the IC, so it would be very helpful if you could contact us as soon as possible.

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Mastermind 18710 points

    Hi Conor,

    The W7 variant is a window voltage monitoring with a +/-7% window tolerance. So the RESET will assert at .744V, UV assertion, or .856V, OV assertion. 

    For Q2, what is the nominal voltage rail, the overvoltage threshold, and under voltage threshold needed? 

    Also what is the timing and bist and latch config needed?

    Jesse 

  • 0 in reply to Jesse Villanueva
    Guru 12115 points

    Jesse

    Considering the schedule for prototyping and evaluation, we need to select parts by February at the latest. One of the selection criteria is whether the parts can be obtained at the time of prototyping.

    Specifically, I would like to know the availability of the custom ICs in the red frame in the attached PDF. The IC's function is required to have two-sided detection.

    LM5155DSSR.pdf

    The reason I did not specify a specific part number is that I would like you to confirm whether there are any custom part numbers other than "TPS3762D02OVDDF" that are likely to be available by February at the latest. If there are, I would like to consider whether they can be used.

    If it takes time to prepare custom ICs other than TPS3762D02OVDDF, please let me know.

    You can reply by email or private message. I'm sorry for asking too much because I don't have much time, but I would be very grateful if you could reply within 24 hours.

    Thanks,

    Conor

  • +1 in reply to Conor
    TI__Mastermind 18710 points

    Continuing discussion through email.

    Jesse