7 Detailed Description

7.1 Overview

The INA290-Q1 is a high-side only current-sense amplifier that offers a wide common-mode range, precision

zero-drift topology, excellent common-mode rejection ratio (CMRR), high bandwidth, and fast slew rate. Different

gain versions are available to optimize the output dynamic range based on the application. The INA290-Q1 is

designed using a transconductance architecture with a current-feedback amplifier that enables low bias currents

of 20 µA and a common-mode voltage of 120 V.

7.2 Functional Block Diagram

IN+

IN±

OUT

V

BUS

+

±

Buffer

Current

Feedback

V

S

GND

RL

R1

R1

Bias

Load

R

SENSE

I

SENSE

INA290-Q1

SBOS995A – OCTOBER 2019 – REVISED NOVEMBER 2020

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