1 Features

1• 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

2 Applications

• Current Shunt Measurement:

– Telephone, Computers

• Portable and Battery-Backup Systems

• Battery Chargers

• Power Management

• Cell Phones

• Precision Current Source

3 Description The INA138 and INA168 (INA1x8) are high-side, unipolar, current shunt monitors. Wide input commonmode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications. Input common-mode and power-supply voltages are independent and can range from 2.7 V to 36 V for the INA138 and 2.7 V to 60 V for the INA168. Quiescent current is only 25 μA, which permits connecting the power supply to either side of the current measurement shunt with minimal error. The device converts a differential input voltage to a current output. This current is converted 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 in measurement and level shifting. Both the INA138 and INA168 are available in SOT23- 5 and are specified for the –40°C to 125°C temperature range.

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