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Technical inquiry about TPS7A2418DBVR

Migaki Yamada
Intellectual 575 points

P/N: TPS7A2418DBVR
We have received technical inquiries from our customers (Panasonic).
Please check the contents of the five inquiries, fill in the answers, and submit to me.

(1) What is the operating variation temperature of the TSD operation start / release temperature?
    Is the operation of TSD a design guarantee?

(2) What is the operating value of overcurrent protection?
    Is the operation guarantee of overcurrent protection a design guarantee?

(3) Is there a connection impedance specification for the FB terminal?

(4) What V is required for the min input potential difference when I-OUT is output at 200mA?

(5) Did we receive a request to confirm the phase characteristics?


Best Regrads,
Migaki YAMADA (SATORI-SPT)

  • 0
    TI__Mastermind 23361 points

    Hi Yamada-san, 

    Please see my comments below your questions. 

    (1) What is the operating variation temperature of the TSD operation start / release temperature?
        Is the operation of TSD a design guarantee?

    --Thermal shutdown is normally obtained from bench testing as the design model is not that good at extreme temperatures. We don't expect to see a big shift in the temperatures from unit to unit. But it's a typical number. 

    (2) What is the operating value of overcurrent protection?

        Is the operation guarantee of overcurrent protection a design guarantee?

    No, this is included in the production test and it has min and max specifications. 

    (3) Is there a connection impedance specification for the FB terminal? 

    Please see 8.1.1 Adjustable Device Feedback Resistors. 

    (4) What V is required for the min input potential difference when I-OUT is output at 200mA?

    We recommend having 250mV headroom for 200mA load. We don't recommen to use the min value here as when condition change, the LDO could be in dropout. 

    (5) Did we receive a request to confirm the phase characteristics?

    We don't recommend running phase check for stability, instead, we highly recommend performing load transients for stability concern. 

    Regards, 
    Jason Song

  • 0 in reply to Jason Song
    Intellectual 575 points

    Hi Janson-san,

    I informed your answer to the customer.
    As a result of customer confirmation, there are additional inquiries from customers for your answers.

    For (1), the customer understood "TPY of TSD"
    Please indicate the upper and lower limits of the TSD design start and release.

    For (2)-(5), the customer understood with the contents of your answer.

    Best Regards,
    Migaki YAMADA (SATORI-SPT)

  • 0 in reply to Migaki Yamada
    TI__Mastermind 23361 points

    Hi Yamada-san, 

    For (1), the customer understood "TPY of TSD"
    Please indicate the upper and lower limits of the TSD design start and release.

    --We only have the typical thermal shutdown number, as this is not a parameter that runs at production. The customer is not intended to use the LDO near thermal shutdown temperature. In the lab, to run one thermal shutdown test, it normally takes 30 - 60 minutes, and in order to have maximum and minimum temperatures for a parameter, we need to run thousands of data and this is simply not possible and not feasible. We cannot use simulations to get the min and max values either because, at extremely high temperatures, the model is not accurate. 

    Thank you, 
    Jason

  • 0 in reply to Jason Song
    Intellectual 575 points

    Hi Janson-san,

    For (1), the answer seems to be a little different from the customer's intention, and the customer has an additional question.

    ## Customer question ##
    What I would like you to answer is that there is a variation in the TSD start temperature, which is predicted by the TSD design simulation, so I would like to confirm that temperature.

    ＊Temperature at which TSD operates at the latest: MAX temperature
    ＊Temperature at which TSD operates fastest: MIN temperature


    Best Regards,
    Migaki YAMADA (SATORI-SPT)

  • 0 in reply to Migaki Yamada
    TI__Mastermind 23361 points

    Since the maximum recommended junction temperature is 150C, and the device has been tested for functionalities up to 150C. The TSD temperature will be higher than 150C.