MAX6069 1μA Ultra-Tiny Shunt Voltage Reference Typical Application Circuits Shunt Regulator Connection In the typical shunt regulator connection shown here, RBIAS sets the current through the load (IL) and the current through the shunt regulator(IR). There are two worst-case situations that RBIAS needs to be sized for: 1) RBIAS must be small enough that when VS (supply voltage) is at its minimum and IL is at its maximum, IR is equal to at least the minimum operating current of the shunt regulator. 2) RBIAS must be large enough that when VS is at its maximum and IL is at its minimum, IR is < 2mA. VS IR + IL RBIAS VR VOUT IL 10nF MAX6069 IR VS - VR RBIAS = IL + IR Precision Current SinkPrecision Current SourceMAX6069CMAX6069C R1 200kΩ R1 +10V 200kΩ -10V IOUT IOUT R2 R2 +1V TO +7V -1V to -7V 2.5V 2.5V IOUT = R2 IOUT = R2 www.analog.com Analog Devices │ 7
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