INA138 INA168 Texas Instruments TI pdf datasheet download

INA138
INA168

High-Side Measurement
CURRENT SHUNT MONITOR

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

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.

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