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Original question:

TPS92682-Q1: TPS92682-Q1 operation at Vin between 4.1V to 7V

TPS92682-Q1: The lowest input voltage that can work.

Kami Huang60
Genius 3830 points
Part Number: TPS92682-Q1

Hello Tuan,

For the following series of questions raised by our customers, he ultimately wants only one answer.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1034340/tps92682-q1-tps92682-q1-operation-at-vin-between-4-1v-to-7v

The customer’s end product is car head lights. He wants to know what is the lowest Vin that the TPS92682-Q1 IC can work? Not VCC volatge.

The car will provide power to his headlights. Because of the long cable length, the input voltage will have voltage lost. So he wants such information.

Best Regards,

Kami Huang

  • 0
    TI__Genius 17690 points

    Hello Kami,

    As I mentioned to you on previous posting.  We spec our part with VCC and that is what we test to since this is the voltage that we use to run our the internal circuit with.  Again, VCC is linear regulated from Vin with about 300mV drop.,

    Thanks Tuan

  • 0 in reply to Tuan Tran74
    Genius 3830 points

    Hello Tuan,

    Thanks for you reply.

    The customer and I confuse the description of these two specifications.

    Could you please elaborate?

    4.9V+ 0.3V=5.2V.  But Min. Vin=6.5V?

    And 

    What does Vin Crank voltage mean? How long does TPS92682 work under Crank voltage?

    What the customer wants is to give him a voltage range within which the TPS92682 can operate normally.

    Best Regards,

    Kami Huang

  • 0 in reply to Kami Huang60
    TI__Genius 17690 points

    Kami,

    If you look at the specification on Vcrank or Vin can work down to 4.5V which means the part will work down to 4.5V indefinitely if it initially starts out at higher voltage like the recommended of 6.5V in the specification. However, the way we do under-voltage is off of VCC and not off of VIN.  As I mentioned before, we monitor VCC for operation and under-voltage lock out.  If VCC is above 4.9V then the part will start operating and if it's below 4.1V then it will stops...There is hystereris there.  There is about 300mV drop out from Vin to VCC so if you look at that then Vin will work down to 4.5V.

    Thanks Tuan

  • 0 in reply to Tuan Tran74
    Genius 3830 points

    Hello Tuan,
    I understand your explanation. What the customer cares about is not the VCC of the IC, but how much voltage he should provide to our TPS926882. How much voltage should Vin provide for TPS92682 to work normally? That's why he kept asking questions about Vin.
    Can I tell the customer like this? Vin accepted by TPS92682. When Vin starts, it must be greater than 6.5V. After TPS92682 works, the Vin voltage must be greater than 4.5V at least.

    Best Regards,

    Kami Huang

  • 0 in reply to Kami Huang60
    TI__Intellectual 1675 points

    Hi Kami,

    We are working on getting back to you regarding this confirmation, and will let you know within 24 hours. Thanks for your patience!

    Best Regards,

    Caroline

  • +1 in reply to Caroline Fuschino
    TI__Genius 17690 points

    Kami,

    You can tell them that if Vin to the TPS92682 is 6.5V first then the part will power up and stay working until Vin is below 4.5V.

    Thanks Tuan