The INA138 and INA168 are high-side, unipolar,current shunt monitors. Wide input common-modevoltage range, low quiescent current, and tiny SOT-23packaging enable use in a variety of applications.Input common-mode and power supply voltages areindependent and can range from 2.7V to 36V for theINA138 and 2.7V to 60V for the INA168. Bothmodels draw only 25mA quiescent current, which alsopermits connecting the power supply to either side ofthe current measurement shunt with minimal error.The device converts a differential input voltage to acurrent output. This current is converted back to avoltage with an external load resistor that sets anygain from 1 to over 100. Although designed forcurrent shunt measurement, the circuit invites creativeapplications in measurement and level shifting.Both the INA138 and INA168 are available inSOT23-5 and are specified for the –40°C to +85°Cindustrial temperature range.
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