INA138_11 Datasheet, PDF (1/15 Pages) Burr-Brown (TI) – High-Side Measurement CURRENT SHUNT MONITOR

INA138
INA168
SBOS122C – DECEMBER 1999 – REVISED NOVEMBER 2005
High-Side Measurement
CURRENT SHUNT MONITOR
FEATURES
q COMPLETE UNIPOLAR HIGH-SIDE
CURRENT MEASUREMENT CIRCUIT
q WIDE SUPPLY AND COMMON-MODE RANGE
q INA138: 2.7V to 36V
q INA168: 2.7V to 60V
q INDEPENDENT SUPPLY AND INPUT COMMON-
MODE VOLTAGES
q SINGLE RESISTOR GAIN SET
q LOW QUIESCENT CURRENT (25µA typ)
q WIDE TEMPERATURE RANGE: –40°C to +125°C
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
V_IN+
Up To 60V
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 inde-
pendent 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.
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
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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.
www.ti.com
Copyright © 1999-2005 Texas Instruments Incorporated