IN2±

IN2+

VS

OUT2

INA2181

IN1±

IN1+

OUT1

+

±

GND

+

±

Copyright © 2017, Texas Instruments Incorporated

REF

IN±

IN+

GND

VS

OUT

INA181

+

±

Copyright © 2017, Texas Instruments Incorporated

REF

13

INA181, INA2181

www.ti.com

SBOS793A – APRIL 2017 – REVISED AUGUST 2017

Product Folder Links: INA181 INA2181

Submit Documentation Feedback

Copyright © 2017, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The INA181 and INA2181 (INAx181) are 26-V, common-mode, current-sensing amplifiers used in both low-side

and high-side configurations. These specially-designed, current-sensing amplifier accurately measures voltages

developed across current-sensing resistors on common-mode voltages that far exceed the supply voltage

powering the device. Current can be measured on input voltage rails as high as 26 V, and the devices can be

powered from supply voltages as low as 2.7 V.

8.2 Functional Block Diagrams

Figure 34. INA181 Functional Block Diagram

Figure 35. INA2181 Functional Block Diagram