IN±

IN+

GND

VS

OUT

+

±

ENABLE

+

±

±

+

TI-Device

TM

12

INA191

SLYS020A – FEBRUARY 2019 – REVISED APRIL 2019

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7 Detailed Description

7.1 Overview

The INA191 is a low bias current, 40-V common-mode, current-sensing amplifier with an enable pin. When

disabled, the output goes to a high-impedance state, and the supply current draw is reduced to less than 0.1 µA.

The INA191 is intended for use in either low-side and high-side current-sensing configurations where high

accuracy and low current consumption are required. The INA191 is a specially designed, current-sensing

amplifier that accurately measure voltages developed across current-sensing resistors on common-mode

voltages that far exceed the supply voltage. Current can be measured on input voltage rails as high as 40 V, with

a supply voltage as low as 1.7 V.

7.2 Functional Block Diagram