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Info TPS7A6933

Good day,

I'm doing a very simple RF device for my vehicule, the consuption is less than 100mAmp and works at 3v3, I found this device, the TPS7A6933, and looks marvelous, but there is no info about it, only a datasheet and the TPS7A6950 EVM. Using the WEBENCH, does not appear, and in the message of why was not used appears something about the Temperature Junction.

The other thing is that I do not know if I can put this TPS directly from battery, with some protection and without using some boost or buck.

Thanks

  • Hi Ryan,

    I am very glad to know you are interested about our high voltage LDO products, and TPS7A6933-Q1 is a member of TPS7A66/69 family. In the family, TPS7A6933-Q1 and TPS7A6950-Q1 are the fixed output voltage LDO, which has 3.3V and 5.0V output voltage respectively, and they are all qualified for automotive application.

    Most electronic characteristics of TPS7A6933-Q1 and TPS7A6950-Q1 are the same, and they also have the same package. The differences are the input voltage range and the output voltage, as TPS7A6933-Q1 has a range of 4V to 40V input voltage and a 3.3V fixed output, and TPS7A6950-Q1 has a range of 5.5V to 40V input voltage and a 5.0V fixed output. Therefore, if you would like to evaluate this product, you could use the TPS7A6950-Q1 EVM soldering with TPS7A6933-Q1 sample.

    At this moment, there is only a PSpice simulation model on www.ti.com, and we are still working on the WEBENCH modeling. I believe this device will launch up in WEBENCH soon.

    As TPS7A6933-Q1 is a high voltage LDO, you can put this part directly from battery.

    If any other question, please don’t hesitate to let me know.

    Best regards,

    Jason Liu

    Automotive Value Line

  • Hi, Jason,

    I can not wait for my samples, I appreciate the information you send me.

    Thanks.

    Walter Osorio

  • Hello Jason,

    Can you help me with  the SI(Sense input pin)  of the TPS7A6933-Q1, can you tell me why the resistors values, R3, R4 and R5 are so high in the EVM, and in the datasheet, in the 18 page says: "TI recommends that the values of both R3 and R4 be less than 100 kΩ. "

    Thanks,

    ANDRÉS FELIPE RODRÍGUEZ

  • Hi Andres,

    Our system engineer help explain this question, the statement in the datasheet page 18 is because of system reason. From many real cases, the resistors R3 and R4 is better for suppressing external noise interference from input voltage, which will trigger SI by mistake.
    And the design in the EVM was from another engineer, he was considering from low quiescent current aspect. He suppose the input voltage is clean enough, and larger R3, R4 and R5 could lower the current consumption.

    While designing, you could evaluate based on your system. However, words in datasheet is more rigorous.

    Best regards,
    Jason Liu
  • Hi Jason,
    Sorry for answer just now, I use thouse high resistors values and did work, any way I'm going to change the values for lower than 100k as you recommend. Thanks