INA139

INA169

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 (60

q SOT23-5 PACKAGE

High-Side Measurement

CURRENT SHUNT MONITOR

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 60

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 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.

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

R

S

2

1

OUT

GND

R

L

V

Load

1k

Ω

1k

Ω

V

IN+

Up to 60V

V

IN+

V

IN–

3

4

I

S

V+

5

SBOS181C – DECEMBER 2000 – REVISED JULY 2004

www.ti.com

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.

Copyright © 2000-2004, Texas Instruments Incorporated

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.