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High-Side Measurement Current Shunt Monitor (Rev. C)
Texas Instruments

Description
The INA138 and INA168 are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT23 packaging enable use in a variety of applications. Input common-mode and power-supply voltages are independent and can range from 2.7V to 36V for the INA138 and 2.7V to 60V for the INA168. Quiescent current is only 25µA, 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.
Features
COMPLETE UNIPOLAR HIGH-SIDE CURRENT MEASUREMENT CIRCUIT WIDE SUPPLY AND COMMON-MODE RANGE INA138: 2.7V to 36V INA168: 2.7V to 60V INDEPENDENT SUPPLY AND INPUT COMMONMODE VOLTAGES SINGLE RESISTOR GAIN SET LOW QUIESCENT CURRENT (25µA typ) WIDE TEMPERATURE RANGE: –40°C to +125°C SOT23-5 PACKAGE APPLICATIONS CURRENT SHUNT MEASUREMENT: Automotive, Telephone, Computers PORTABLE AND BATTERY-BACKUP SYSTEMS BATTERY CHARGERS POWER MANAGEMENT CELL PHONES PRECISION CURRENT SOURCE All trademarks are the property of their respective owners.

Related Datasheets
Part Number Description Category
•  INA139 High-Side Measurement Current Shunt Monitor (Rev. D) Actives - Sensors and Transducers
•  INA168 High-Side Measurement Current Shunt Monitor (Rev. C) Actives - Sensors and Transducers
•  INA169 High-Side Measurement Current Shunt Monitor (Rev. D) Actives - Sensors and Transducers
•  INA170 High-Side, Bidirectional Current Shunt Monitor (Rev. D) Actives - Sensors and Transducers
•  INA193 Current Shunt Monitor, -16V to +80V Common-Mode Range (Rev. E) Actives - Sensors and Transducers
•  INA200 High-Side Measurement Current-ShuntMonitor with Comparator and Reference (Rev. B) Actives - Sensors and Transducers
•  INA209 High-Side Measurement, Bi-Directional Current/Power Monitor with I2C Interface (Rev. A) Actives - Sensors and Transducers



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