I

S

R

S

V

IN+

Up To 60V

3

4

V

IN+

V

IN–

5kΩ

5kΩ

Load

V+

5

GND

2

OUT

1

V = I R R

O

S

S

R

L

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INA138, INA168

SBOS122D – DECEMBER 1999 – REVISED DECEMBER 2014

INA1x8 High-Side Measurement Current Shunt Monitor

1 Features

3 Description

The INA138 and INA168 are high-side, unipolar,

1

•

Complete Unipolar High-Side Current

current shunt monitors. Wide input common-mode

Measurement Circuit

voltage range, low quiescent current, and tiny SOT-

•

Wide Supply and Common-Mode Range

23 packaging enable use in a variety of applications.

•

INA138: 2.7 V to 36 V

Input common-mode and power-supply voltages are

•

INA168: 2.7 V to 60 V

independent and can range from 2.7 V to 36 V for the

•

Independent Supply and Input Common-Mode

INA138 and 2.7 V to 60 V for the INA168. Quiescent

current is only 25 µA, which permits connecting the

Voltages

power

supply

to

either

side

of

the

current

•

Single Resistor Gain Set

measurement shunt with minimal error.

•

Low Quiescent Current (25 µA Typical)

The device converts a differential input voltage to a

•

Wide Temperature Range: –40°C to +125°C

current output. This current is converted back to a

•

5-Pin SOT-23 Package

voltage with an external load resistor that sets any

gain from 1 to over 100. Although designed for

2 Applications

current

shunt

measurement,

the

circuit

invites

creative applications in measurement and level

•

Current Shunt Measurement:

shifting.

–

Automotive, Telephone, Computers

Both the INA138 and INA168 are available in SOT23-

•

Portable and Battery-Backup Systems

5 and are specified for the –40°C to 125°C

•

Battery Chargers

temperature range.

•

Power Management

Device Information(1)

•

Cell Phones

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Precision Current Source

INA138

SOT-23 (5)

18.00 mm × 18.00 mm

INA168

SOT-23 (5)

18.00 mm × 18.00 mm

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

the end of the datasheet.

Typical Application Circuit

1

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.