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REF3012 voltage reference output drive

Other Parts Discussed in Thread: REF3012


Does the REF3012 support a 1.71V input at output loads between 50-100uA?

I see conflicting notes in the datasheet that say:

Note 1, Minimum supply voltage for REF3012 is 1.8V, but then a little above that in the power supply section the min spec over temp is Vref + 50mV (min).

We are using the REF3012 on a number of our boards with a 1.8V supply that could dip as low as 1.71V (3% tolerance).


Steve Logan


  • Steve,

    If you read the REF30xx PDS carefully, there should be no confusion regarding the minimum supply voltage; see below CONDITIONS for Line Regulation (PSRR) - for REF3012 (Vref=1.250V) the required supply voltage range, VIN, is from 1.8V to 5.5V while for all other (higher voltage) reference options VIN is from Vref+50mV to 5.5V; 

    In other words, 1.8V minimum supply voltage is required for the circuit as a whole (bandgap) to work properly but in order for the reference voltage (output stage) to maintain its high precision (like line regulation), it needs to be powered from supply above Vref  (above so called dropout voltage) , VIN>Vref+50mV. 

    All in all, REF30xx family including REF3012 is NOT tested with supply below 1.8V and thus no spec is specified under such conditions but REF30xx circuit topology will allow normal circuit operation with supply down to 1.7V