7 Detailed Description

7.1 Overview

The INA190-Q1 is a low bias current, low offset, 40-V common-mode, current-sensing amplifier. The DDF

SOT-23 package also features an enable pin. The INA190-Q1 is a specially designed, current-sensing amplifier

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

far exceed the supply voltage. Current is measured on input voltage rails as high as 40 V at VIN+ and VIN–, with

a supply voltage, VS, as low as 1.7 V. When disabled, the output goes to a high-impedance state, and the supply

current draw is reduced to less than 0.1 µA. The INA190-Q1 is intended for use in both low-side and high-side

current-sensing configurations where high accuracy and low current consumption are required.

7.2 Functional Block Diagram

IN±

IN+

GND

VS

OUT

+

±

REF

ENABLE

(1)

+

±

±

+

INA190-Q1

1. The ENABLE pin is available only in the DDF package.

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INA190-Q1

SBOS871A – MAY 2019 – REVISED MARCH 2022

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Product Folder Links: INA190-Q1