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INA168NA/250
High-Side Measurement Current Shunt Monitor, Current Output
RSVIN+
UpTo 60 V 3 4
VIN+ VIN–
5 kΩ 5 kΩ
Load
GND
OUTIRS
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INA138, INA168SBOS122E –DECEMBER 1999–REVISED DECEMBER 2017
INA1x8 High-Side Measurement Current Shunt Monitor Features Complete Unipolar High-Side Current
Measurement Circuit Wide Supply and Common-Mode Range INA138: 2.7Vto 36V INA168: 2.7Vto 60V Independent Supply and Input Common-Mode
Voltages Single Resistor Gain Set Low Quiescent Current (25 µA Typical) Wide Temperature Range: –40°Cto +125°C 5-Pin SOT-23 Package
Applications Current Shunt Measurement: Telephone, Computers Portable and Battery-Backup Systems Battery Chargers Power Management Cell Phones Precision Current Source
DescriptionThe INA138 and INA168 (INA1x8) are high-side,
unipolar, current shunt monitors. Wide input common-
mode 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 2.7Vto 36V for the
INA138 and 2.7Vto 60V for the INA168. Quiescent
currentis only 25 µA, which permits connecting the
power supply to either side of the current
measurement shunt with minimal error.
The device convertsa differential input voltagetoa
current output. This currentis converted backtoa
voltage with an external load resistor that sets any
gain from1 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 availablein SOT23- and are specified for the –40°C to 125°C
temperature range.
Device Information(1)(1) Forall available packages, seethe package option addendumthe endofthe datasheet.
Typical Application Circuit
