INA138_14 Datasheet, PDF (1/27 Pages) Texas Instruments – High-Side Measurement Current Shunt Monitor

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INA138, INA168
SBOS122D – DECEMBER 1999 – REVISED DECEMBER 2014
INA1x8 High-Side Measurement Current Shunt Monitor
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:
– Automotive, Telephone, Computers
• Portable and Battery-Backup Systems
• Battery Chargers
• Power Management
• Cell Phones
• Precision Current Source
3 Description
The INA138 and INA168 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 2.7 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA138
SOT-23 (5)
18.00 mm × 18.00 mm
INA168
SOT-23 (5)
18.00 mm × 18.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
V_IN+
Up To 60V
Typical Application Circuit
R_S
I_S
3
V_IN+
5kΩ
4
V_IN–
5kΩ
Load
V+
5
GND
2
OUT
1
V_O = I_SR_SR_L/5kΩ
R_L
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.