INA170_17 Datasheet, PDF (1/15 Pages) Texas Instruments – High-Side, Bidirectional CURRENT SHUNT MONITOR

INA170
SBOS193D – MARCH 2001 – REVISED JANUARY 2006
High-Side, Bidirectional
CURRENT SHUNT MONITOR
FEATURES
q COMPLETE BIDIRECTIONAL CURRENT
MEASUREMENT CIRCUIT
q WIDE SUPPLY RANGE: 2.7V to 40V
q SUPPLY-INDEPENDENT COMMON-MODE
VOLTAGE: 2.7V TO 60V
q RESISTOR PROGRAMMABLE GAIN SET
q LOW QUIESCENT CURRENT: 75µA (typ)
q MSOP-8 PACKAGE
APPLICATIONS
q CURRENT SHUNT MEASUREMENT:
Automotive, Telephone, Computers, Power
Systems, Test, General Instrumentation
q PORTABLE AND BATTERY-BACKUP
SYSTEMS
q BATTERY CHARGERS
q POWER MANAGEMENT
q CELL PHONES
DESCRIPTION
The INA170 is a high-side, bidirectional current shunt moni-
tor featuring a wide input common-mode voltage range, low
quiescent current, and a tiny MSOP-8 package.
Bidirectional current measurement is accomplished by out-
put offsetting. The offset voltage level is set with an external
resistor and voltage reference. This permits measurement of
a bidirectional shunt current while using a single supply for
the INA170.
Input common-mode and power-supply voltages are inde-
pendent. Input voltage can range from +2.7V to +60V on any
supply voltage from +2.7V to +40V. Low 10µA input bias
current adds minimal error to the shunt current.
The INA170 converts a differential input voltage to a current
output. This current develops a voltage across an external
load resistor, setting any gain from 1 to over 100.
The INA170 is available in an MSOP-8 package, and is
specified over the extended industrial temperature range,
–40°C to +85°C with operation from –55°C to +125°C.
V_SUPPLY
I_S
R_S
V_IN+
2
V_I^–_N
1
Load
V_{REF 3}
R_{OS 5}
R_OS
V+
8
R_G1
1kΩ
R_G2
1kΩ
A1
Q1
6
OUT
A2
Q2
R_L
INA170
GND 4
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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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