INA4181 (quad-channel)

INA4181 (quad-channel)

INA2181 (dual-channel)

INA181 (single-channel)

2.7 V to 5.5 V

ADC

Microcontroller

Up To 26 V

VS

Load

0.1 µF

GND

IN±

IN+

OUT

REF

+

±

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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.

INA181, INA2181, INA4181

SBOS793B – APRIL 2017 – REVISED NOVEMBER 2017

INAx181 Bidirectional, Low- and High-Side Voltage Output,

Current-Sense Amplifiers

1

1 Features

1

•

•

High Bandwidth: 350 kHz (A1 Devices)

•

Offset Voltage:

–

–

•

Output Slew Rate: 2 V/µs

•

Bidirectional Current-Sensing Capability

•

Accuracy:

–

±1% Gain Error (Max)

–

1-µV/°C Offset Drift (Max)

•

Gain Options:

–

20 V/V (A1 Devices)

–

50 V/V (A2 Devices)

–

100 V/V (A3 Devices)

–

200 V/V (A4 Devices)

•

Quiescent Current: 260 µA Max (INA181)

2 Applications

•

Motor Control

•

Battery Monitoring

•

Power Management

•

Lighting Control

•

Overcurrent Detection

•

Solar Inverters

3 Description

The INA181, INA2181, and INA4181 (INAx181)

current sense amplifiers are designed for cost-

optimized applications. These devices are part of a

family of bidirectional, current-sense amplifiers (also

called current-shunt monitors) that sense voltage

drops across current-sense resistors at common-

mode voltages from –0.2 V to +26 V, independent of

the supply voltage. The INAx181 family integrates a

matched resistor gain network in four, fixed-gain

device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V.

This matched gain resistor network minimizes gain

error and reduces the temperature drift.

These devices operate from a single 2.7-V to 5.5-V

power supply. The single-channel INA181 draws a

maximum supply current of 260 µA; whereas, the

dual-channel INA2181 draws a maximum supply

current of 450 µA, and the quad-channel INA4181

draws a maximum supply current of 900 µA.

The INA181 is available in a 6-pin, SOT-23 package,

the INA2181 is available in an 10-pin VSSOP

package, and the INA4181 is available in a 20-pin

TSSOP package. All device options are specified

over the extended operating temperature range of

–40°C to +125°C.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA181

SOT-23 (6)

2.90 mm × 1.60 mm

INA2181(2)

VSSOP (10)

3.00 mm × 3.00 mm

INA4181(2)

TSSOP (20)

6.50 mm × 4.40 mm

(1) For all available packages, see the package option addendum

at the end of the datasheet.

(2) INA2181 and INA4181 are preview devices.

Typical Application Circuit