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REF3030: dropout voltage with load current for REF30XX

Ken Zhang
Expert 3285 points

Part Number: REF3030

Tool/software:

HI,

what are the dropout voltage with load current  for REF30XX for full temperature range? is the maximum dropout voltage is 300mV for all REF30XX for full temperature range and Iout<=25mA?

below curve is on Page 1 of REF30XX datasheet.

  • 0
    TI__Expert 7910 points

    Hi Ken,

    What input voltage are you planning on using?

    The electrical characteristics table states that the data is at 25°C unless specified otherwise. I will look to see if we have any data to share with regards to temperature.

    Thanks,

    Jackson

  • 0 in reply to Jackson Wightman
    TI__Expert 3285 points

    Jackson

    The input voltage minimum is 3V.

    customer wants to know if output voltage of REF3030 can be regulated at 3V for both full temperature voltage and Iout<=25mA?

  • 0 in reply to Ken Zhang
    TI__Expert 7910 points

    Hi Ken,

    Looking at the electrical characteristics table in REF3030's datasheet, we can see the dropout voltage has a maximum value of 50 mV with a load current of 0 mA at room temperature. 

    For this reason, I would suggest that a minimum input voltage of 3V is too low, regardless of temperature, especially if using an Iout of 25mA, which can have a dropout voltage of up to 300 mV:

    However, if a sufficient voltage input is applied to REF3030, there will be no issues having the output regulating to 3V across full temperature range and up to 25mA output current.

    Thanks,

    Jackson

  • 0 in reply to Jackson Wightman
    TI__Expert 3285 points

    Jackson

    sorry, there is an input error!

    The input voltage minimum is 3.3V.As there is no the curve of dropout voltage vs load current with different temperature and no data for REF3030(data listed in datasheet is for REF3025),customer wants to know if output voltage of REF3030 can be regulated at 3.3V for both full temperature voltage and Iout<=25mA?

  • 0 in reply to Ken Zhang
    TI__Expert 7910 points

    Hi Ken,

    Even at 25°C, using a 3.3V input voltage is risky. If the voltage were to drop below 3.3V when the load current is 25 mA due to error in the power supply from an LDO or DC/DC converter, then there is also risk of the device not operating properly. For REF3030, I would suggest maybe something higher than 3.3V for the input voltage.

    You could consider a pin-to-pin option, such as REF3330 or REF3130 which has a lower dropout voltage. However, these devices can only source up to 5 mA to 10mA. How much current does the customer need to source from the reference?

    Thanks,

    Jackson

  • 0 in reply to Jackson Wightman
    TI__Expert 3285 points

    Jackson

    well noted!

    Customer just wants to know the maximum voltage drop to avoid any risks for their application. the 15mA is the maximum in current project.

  • 0 in reply to Ken Zhang
    TI__Expert 7910 points

    Hi Ken,

    That makes sense. Since REF3030 is an older part, it may be a while until we are able to find raw data reporting the dropout voltage at high temperatures. I would expect the dropout voltage to remain close to the curve included in the datasheet, but I cannot provide a maximum value at this time. If I am able to find this data, I will contact you with the information. For now, I would suggest an input voltage above 3.3 V.

    Thanks,

    Jackson