what is max voltage drop for REF3425 at 2mA ouput current? Unfortunately the datasheet only specs 100mV at 0mA and 500mV.at 10mA. Our budget is 250mVmax at 2mA.
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The datasheet spec is a max worst case and typically tested at production. Since 2mA is not tested a max cannot be guaranteed for 2mA. The typical dropout graph is shown on page 1 and shows a very linear relationship between current and dropout voltage. I am confident that your 0.25V will work for 2mA.