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TLV702-Q1: How many inputs should I give if I want a stable 3V / 300mA? Does the circuit need to be adjusted?

user5707026
Genius 3145 points
Part Number: TLV702-Q1

Hi,

The PN is TLV70230QDSERQ1;

We use TLV70230QDSERQ1, input 3.3V or 4V, measured output is 2V, EN is 2.8V, how many inputs should be set to get stable 3V / 300mA, does the circuit need to be adjusted? How to adjust?

Is there a corresponding table for input, output, and current?

This is also the case when no-load, not like the problem of overload;

Thanks

Elsa Duan

  • 0
    TI__Mastermind 43580 points

    Hi Elsa,

    With 3.3VIN and 3.0VOUT at 300mA, you should not be getting into thermal shutdown. Also, you are within the drop-out margin so the LDO should be able to properly regulate 3.0V. If VIN is 4V, then maybe you can get closer to thermal shutdown. But as you mention that you see the lower output voltage even with no load, this is not likely the issue. 

    The best graph we have to show you that it should be working is here:

    This shows you show have ~50mV of margin at 300mA. 

    Have you tried swapping out the device? Any chance it was somehow damaged?

  • 0 in reply to JCHK
    Genius 3145 points

    Hi John

    From this table, there is a maximum voltage drop of 300mV at normal temperature, and no 2V output should appear;
    We changed six chips, and the results were all the same.
    If we need to change another chip, which one you will recommend?
    If we need not to change chip, what we should do?
    Thanks
    Elsa Duan
  • 0 in reply to JCHK
    Genius 3145 points

    Hi John

    Can you kindly recommend a 3.3V to 3V LDO with low quiescent current and short power-up time?

    The Load current is 300mA.

    Thanks.

    Elsa Duan

  • 0 in reply to user5707026
    TI__Mastermind 43580 points

    HI Else,

    Sorry for the long delay in response. I have been out of the office for the holidays in the US.

    Can you share an Oscilloscope shot sowing Enable, VIN, and VOUT?