1 Features

? AEC-Q100 qualified for automotive applications

– Temperature grade 1: –40°C ≤ TA ≤ 125°C

– HBM ESD classification level 2

– CDM ESD classification level C6

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? Common-mode range (VCM): –0.2V to 26V

? High bandwidth: 350kHz (A1 devices)

? Offset voltage:

– ±150μV (maximum) at VCM = 0V

– ±500μV (maximum) at VCM = 12V

? Output slew rate: 2V/μs

? Bidirectional current-sensing capability

? Accuracy:

– ±1 gain error (maximum)

– 1μV/°C offset drift (maximum)

? Gain options:

– 20V/V (A1 devices)

– 50V/V (A2 devices)

– 100V/V (A3 devices)

– 200V/V (A4 devices)

? Quiescent current: 260μA maximum (INA181-Q1)

2 Applications

? Motor control

? Battery monitors and balancers

? Power management

? Lighting control

3 Description

The INA181-Q1, INA2181-Q1, and INA4181-Q1

(INAx181-Q1) 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 –0.2V to 26V,

independent of the supply voltage. The INAx181-Q1

family integrates a matched resistor gain network in

four, fixed-gain device options: 20V/V, 50V/V, 100V/V,

or 200V/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-Q1 draws

a maximum supply current of 260μA; whereas, the

dual-channel INA2181-Q1 draws a maximum supply

current of 500μA, and the quad-channel INA4181-Q1

draws a maximum supply current of 900μA.

The INA181-Q1 is available in both the 6-pin, SOT-23

and SC70 packages. The INA2181-Q1 is available

in a 10-pin, VSSOP package. The INA4181-Q1 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.