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INA181, INA2181, INA4181

SBOS793C – APRIL 2017 – REVISED DECEMBER 2017

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Product Folder Links: INA181 INA2181 INA4181

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Copyright © 2017, Texas Instruments Incorporated

Table of Contents

1

Features .................................................................. 1

2

Applications ........................................................... 1

3

Description ............................................................. 1

4

Revision History..................................................... 2

5

Device Comparison Table..................................... 3

6

Pin Configurations and Functions ....................... 3

7

Specifications......................................................... 6

7.1

Absolute Maximum Ratings ..................................... 6

7.2

ESD Ratings.............................................................. 6

7.3

Recommended Operating Conditions ....................... 6

7.4

Thermal Information .................................................. 6

7.5

Electrical Characteristics........................................... 7

7.6

Typical Characteristics .............................................. 8

8

Detailed Description ............................................ 15

8.1

Overview ................................................................. 15

8.2

Functional Block Diagrams ..................................... 15

8.3

Feature Description................................................. 17

8.4

Device Functional Modes........................................ 19

9

Application and Implementation ........................ 22

9.1

Application Information............................................ 22

9.2

Typical Application .................................................. 29

10

Power Supply Recommendations ..................... 31

10.1

Common-Mode Transients Greater Than 26 V .... 31

11

Layout................................................................... 32

11.1

Layout Guidelines ................................................. 32

11.2

Layout Example .................................................... 32

12

Device and Documentation Support ................. 35

12.1

Device Support...................................................... 35

12.2

Documentation Support ........................................ 35

12.3

Related Links ........................................................ 35

12.4

Receiving Notification of Documentation Updates 35

12.5

Community Resources.......................................... 35

12.6

Trademarks ........................................................... 35

12.7

Electrostatic Discharge Caution ............................ 35

12.8

Glossary ................................................................ 36

13

Mechanical, Packaging, and Orderable

Information ........................................................... 36

4 Revision History

Changes from Revision B (November 2017) to Revision C

Page

•

Changed INA2180 device from preview to production data (active) ...................................................................................... 1

•

Added "Both Inputs" to Figure 21 title .................................................................................................................................. 10

•

Added new Figure 24 for INA2181 ....................................................................................................................................... 10

•

Added new Figure 25 placeholder for INA4181 ................................................................................................................... 11

•

Added new Figure 27 for INA2181 ....................................................................................................................................... 11

•

Added new Figure 28 placeholder for INA4181 ................................................................................................................... 11

•

Changed Figure 29 and added "(A3 Devices)" to end of title............................................................................................... 11

•

Added new Figure 38 for INA2181 ....................................................................................................................................... 13

•

Changed "less than 150 μV" to "within ±150 μV" regarding offset voltage in Precise Low-Side Current Sensing section.. 18

•

Added text regarding RC filter and reference to application report to note at the bottom of Figure 45 .............................. 22

•

•

•

Added new content to Summing Multiple Currents section and moved to Application Information section ........................ 26

•

Added new content to Detecting Leakage Currents section and moved to Application Information section ....................... 27

•

Added new bullet to Layout Guidelines section .................................................................................................................. 32

Changes from Revision A (August 2017) to Revision B

Page

•

Added INA4181 preview device and associated content to data sheet ................................................................................. 1

•

Changed design parameter name in Table 3 from "Accuracy" to "Current sensing error" for clarity .................................. 29

•

Changed "RMS" to "RSS" in reference to equation 7 ......................................................................................................... 30

Changes from Original (April 2017) to Revision A

Page

•

Added INA2181 preview device and associated content to data sheet ................................................................................. 1