INA138 - 36V, High-Side, Current Output Current Sense Amplifier

The INA138 and INA168 (INA1x8) are high-side, unipolar, current shunt monitors. Wideinput common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in avariety of applications.

Input common-mode and power-supply voltages are independent and can range from 2.7 V to36 V for the INA138 and 2.7 V to 60 V for the INA168. Quiescent current is only 25 µA, whichpermits connecting the power supply to either side of the current measurement shunt with minimalerror.

The device converts a differential input voltage to a current output. This current isconverted back to a voltage with an external load resistor that sets any gain from 1 to over 100.Although designed for current shunt measurement, the circuit invites creative applications inmeasurement and level shifting.

Both the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to125°C temperature range.

• Complete Unipolar High-Side Current Measurement Circuit
• Wide Supply and Common-Mode Range
• INA138: 2.7 V to 36 V
• INA168: 2.7 V to 60 V
• Independent Supply and Input Common-Mode Voltages
• Single Resistor Gain Set
• Low Quiescent Current (25 µA Typical)
• Wide Temperature Range: –40°C to +125°C
• 5-Pin SOT-23 Package

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