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The internal voltage reference is 0.6V +/-1% over the temperature range .
The output accuracy when using an external reference is +/-0.6% (SS/REFIN-to-FB Accuracy)
plus the external reference accuracy.
The output accuracy will depend on the output voltage, internal reference accuracy, resistor tolerance and the SS/REFIN to FB accuracy using an external reference.
%Vo = %VREF + 2/(1+Rfbls/Rfbls)*%Rtol see page 26 of www.ti.com/.../slup207.pd