INAx290 2.7-V to 120-V, 1.1-MHz, Ultra-Precise Current Sense Amplifier

1 Features

• Wide common-mode voltage:

– Operational voltage: 2.7 V to 120 V

– Survival voltage: −20 V to +122 V

• Excellent CMRR:

– 160-dB DC

– 85-dB AC at 50 kHz

• Accuracy

– Gain:

• Gain error: ±0.1% (maximum)

• Gain drift: ±5 ppm/°C (maximum)

– Offset:

• Offset voltage: ±12 µV (maximum)

• Offset drift: ±0.2 µV/°C (maximum)

• Available gains:

– INAx290A1: 20 V/V

– INAx290A2: 50 V/V

– INAx290A3: 100 V/V

– INAx290A4: 200 V/V

– INAx290A5: 500 V/V

• High bandwidth: 1.1 MHz

• Slew rate: 2 V/µs

• Quiescent current: 370 µA(per channel)

2 Applications

• Active antenna system mMIMO (AAS)

• Macro remote radio unit (RRU)

• 48-V rack server

• 48-V merchant network & server power supply

• Test and measurement

3 Description

The INAx290 is an ultra-precise current sense

amplifier that can measure voltage drops across shunt

resistors over a wide common-mode range from 2.7 V

to 120 V. It is in a highly space-efficient SC-70

package with a PCB footprint of only 2.0 mm × 2.1

mm. The ultra-precise current measurement accuracy

is achieved thanks to the combination of an ultra-low

offset voltage of ±12 µV (maximum), a small gain

error of ±0.1% (maximum), and a high DC CMRR of

160 dB (typical). The INAx290 is not only designed for

DC current measurement, but also for high-speed

applications (like fast overcurrent protection, for

example) with a high bandwidth of 1.1 MHz (at gain of

20 V/V) and an 85-dB AC CMRR (at 50 kHz).

The INAx290 provides the capability to make ultra-

precise current measurements by sensing the voltage

drop across a shunt resistor over a wide common-

mode range from 2.7 V to 120 V. The INAx290

devices come in highly space-efficient packages. The

single channel INA290 device is featured in the SC-70

package while the dual channel INA2290 device is

available in the VSSOP-8 package.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

INA290

SC-70 (5)

2.00 mm × 1.25 mm

INA2290(2)

VSSOP (8)

3.00 mm × 3.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

(2)

Advanced information

SAR

ADC

IN+

IN±

OUT

+

±

Buffer

Current

Feedback

GND

RL

R1

R1

Bias

Load

INA290 (single channel)

INA2290 (dual channel)

Typical Application

www.ti.com

INA290, INA2290

SBOS961A – JUNE 2020 – REVISED SEPTEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

Submit Document Feedback

1

Product Folder Links: INA290 INA2290

INA290, INA2290

SBOS961A – JUNE 2020 – REVISED SEPTEMBER 2020

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.