7 Detailed Description

7.1 Overview

The INA280 is a high-side only current-sense amplifier that offers a wide common-mode range, 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 INA280 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

CM

+

±

Buffer

Current

Feedback

V

S

GND

RL

R1

R1

Bias

Load

R

SENSE

I

SENSE

7.3 Feature Description

7.3.1 Amplifier Input Common-Mode Range

The INA280 supports large input common-mode voltages from 2.7 V to 120 V and features a high DC CMRR of

140 dB (typical) and a 85-dB AC CMRR at 50 kHz. The minimum common-mode voltage is restricted by the

supply voltage as shown in Figure 7-1. The topology of the internal amplifiers INA280 restricts operation to high-

side, current-sensing applications.

Supply Voltage (V)

0

2.5

5

7.5

10

12.5

15

17.5

20

0

1

2

3

4

5

6

7

8

VCM = 2.7V

Figure 7-1. Minimum Common-Mode Voltage vs Supply

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INA280

SBOSA19 – OCTOBER 2020

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