INA139 Datasheet, PDF (1/11 Pages) Texas Instruments – High-Side Measurement CURRENT SHUNT MONITOR

INA139
INA169
SBOS181C – DECEMBER 2000 – REVISED JULY 2004
High-Side Measurement
CURRENT SHUNT MONITOR
FEATURES
q COMPLETE UNIPOLAR HIGH-SIDE
CURRENT MEASUREMENT CIRCUIT
q WIDE SUPPLY AND COMMON-MODE RANGE
q INA139: 2.7V to 40V
q INA169: 2.7V to 60V
q INDEPENDENT SUPPLY AND INPUT COMMON-
MODE VOLTAGES
q SINGLE RESISTOR GAIN SET
q LOW QUIESCENT CURRENT (60µA typ)
q SOT23-5 PACKAGE
APPLICATIONS
q CURRENT SHUNT MEASUREMENT:
Automotive, Telephone, Computers
q PORTABLE AND BATTERY-BACKUP
SYSTEMS
q BATTERY CHARGERS
q POWER MANAGEMENT
q CELL PHONES
q PRECISION CURRENT SOURCE
DESCRIPTION
The INA139 and INA169 are high-side, unipolar, current
shunt monitors. Wide input common-mode voltage range,
high-speed, low quiescent current, and tiny SOT23 packag-
ing enable use in a variety of applications.
Input common-mode and power-supply voltages are inde-
pendent and can range from 2.7V to 40V for the INA139 and
2.7V to 60V for the INA169. Quiescent current is only 60µA,
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 cir-
cuit invites creative applications in measurement and level
shifting.
Both the INA139 and INA169 are available in SOT23-5
packages and are specified for the –40°C to +85°C industrial
temperature range.
V_IN+
Up to 60V
R_S
I_S
3
V_IN+
1kΩ
4
V_IN–
1kΩ
Load
V+
5
GND
2
OUT
1
V_O = I_SR_SR_L/1kΩ
R_L
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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