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INA181, INA2181, INA4181

SBOS793G – APRIL 2017 – REVISED MAY 2020

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Product Folder Links: INA181 INA2181 INA4181

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Copyright © 2017–2020, Texas Instruments Incorporated

Table of Contents

1

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

2

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

3

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

4

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

5

Device Comparison Table..................................... 4

6

Pin Configuration and Functions ......................... 4

7

Specifications......................................................... 7

7.1

Absolute Maximum Ratings ..................................... 7

7.2

ESD Ratings.............................................................. 7

7.3

Recommended Operating Conditions ....................... 7

7.4

Thermal Information .................................................. 7

7.5

Electrical Characteristics........................................... 8

7.6

Typical Characteristics .............................................. 9

8

Detailed Description ............................................ 16

8.1

Overview ................................................................. 16

8.2

Functional Block Diagrams ..................................... 16

8.3

Feature Description................................................. 18

8.4

Device Functional Modes........................................ 20

9

Application and Implementation ........................ 23

9.1

Application Information............................................ 23

9.2

Typical Application .................................................. 30

10

Power Supply Recommendations ..................... 32

10.1

Common-Mode Transients Greater Than 26 V .... 32

11

Layout................................................................... 33

11.1

Layout Guidelines ................................................. 33

11.2

Layout Example .................................................... 33

12

Device and Documentation Support ................. 37

12.1

Device Support...................................................... 37

12.2

Documentation Support ........................................ 37

12.3

Related Links ........................................................ 37

12.4

Receiving Notification of Documentation Updates 37

12.5

Support Resources ............................................... 37

12.6

Trademarks ........................................................... 37

12.7

Electrostatic Discharge Caution ............................ 37

12.8

Glossary ................................................................ 37

13

Mechanical, Packaging, and Orderable

Information ........................................................... 38

4 Revision History

Changes from Revision F (March 2019) to Revision G

Page

•

Added INA2181 10-pin WSON package to the data sheet .................................................................................................... 1

Changes from Revision E (July 2018) to Revision F

Page

•

Added new paragraph regarding phase reversal to end of Input Differential Overload section........................................... 21

•

Changed Figure 57 to fix pin number typos ......................................................................................................................... 33

•

Changed Figure 58 to fix pin number typos ........................................................................................................................ 34

Changes from Revision D (March 2018) to Revision E

Page

•

Changed instances of INAx180 to INAx181 (typos) ............................................................................................................... 1

Changes from Revision C (December 2017) to Revision D

Page

•

Changed INA4181 device from preview to production data (active) ..................................................................................... 1

•

Added new Figure 25 for INA4181 ....................................................................................................................................... 12

•

Added new Figure 28 for INA4181 ....................................................................................................................................... 12

•

Added "other" to first sentence after Figure 49 to clarify channel connection in Summing Multiple Currents section......... 27

Changes from Revision B (November 2017) to Revision C

Page

•

Changed INA2181 device from preview to production data (active) ...................................................................................... 1

•

Added "Both Inputs" to Figure 21 title .................................................................................................................................. 11

•

Added new Figure 24 for INA2181 ....................................................................................................................................... 11

•

Added new Figure 25 placeholder for INA4181 ................................................................................................................... 12

•

Added new Figure 27 for INA2181 ....................................................................................................................................... 12