R

S

2

1

OUT

GND

R

L

V

O = ISRSRL/1kΩ

Load

1kΩ

1kΩ

V

IN+

Up to 60 V

V

IN+

V

IN–

3

4

I

S

V+

5

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Design

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.

INA139, INA169

SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017

INA1x9 High-Side Measurement Current Shunt Monitor

1

1 Features

1

•

Complete Unipolar High-Side Current

Measurement Circuit

•

Wide Supply and Common-Mode Range

•

INA139: 2.7 V to 40 V

•

INA169: 2.7 V to 60 V

•

Independent Supply and Input Common-Mode

Voltages

•

Single Resistor Gain Set

•

Low Quiescent Current: 60 µA (Typical)

•

5-Pin, SOT-23 Packages

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 INA139 and INA169 are high-side, unipolar,

current shunt monitors. Wide input common-mode

voltage range, high-speed, 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 40 V for the

INA139 and 2.7 V to 60 V 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

circuit

invites

creative applications in measurement and level

shifting.

Both the INA139 and INA169 are available in 5-pin

SOT-23 packages. The INA139 device is specified for

the –40°C to +125°C temperature range, and the

INA169 is specified from –40°C to +85°C.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA139

SOT-23 (5)

2.90 mm × 1.60 mm

INA169

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit