VOUT

RESET

ALERT

IN+

IN±

VS+

GND

CMPIN

CMPREF

10 k:

+

±

0 V to 26 V

+

-

G = 20, 50,

100, 200

ADC

GPIO

GPIO

R1

R2

Microcontroller

5 V

2.7 V to 5.5 V

Load

INA381-Q1

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

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. PRODUCTION DATA.

INA381-Q1

SLYS041 – MARCH 2020

INA381-Q1 AEC-Q100, 26-V, 350-kHz Current Sense Amplifier With Integrated Overcurrent

Comparator

1

1 Features

1

•

Qualified for Automotive Applications

•

AEC-Q100 Qualified With the Following Results:

–

Device Temperature Grade 1: –40°C to

+125°C Ambient Operating Temperature

•

Common-mode input range: –0.2 V to +26 V

•

High accuracy amplifier:

–

–

–

–

Offset voltage drift: 1 µV/°C (maximum)

–

Gain error: 1% (maximum) at 25°C

–

Gain error drift: 20 ppm/°C (maximum)

•

Available amplifier gains:

–

INA381A1-Q1: 20 V/V

–

INA381A2-Q1: 50 V/V

–

INA381A3-Q1: 100 V/V

–

INA381A4-Q1: 200 V/V

•

Open-drain comparator:

–

Hysteresis: 50 mV

–

Propagation delay: 400 ns (typical)

–

Alert threshold set through external reference

voltage

–

Supports transparent and latching modes

•

Package: VSSOP-10

2 Applications

•

ADAS domain controller

•

Body control module (BCM)

•

Window module

•

Roof motor module

•

Seat position & fold module

•

Interior heater module

•

Telematics control unit

•

Digital cockpit processing unit

•

Automotive head unit

3 Description

The INA381-Q1 includes both a 26-V common-mode,

current-sensing

amplifier

and

a

high-speed

comparator.

This

device

detects

overcurrent

conditions by measuring the voltage developed

across a current-shunt resistor and comparing that

voltage to a user-defined threshold limit set by the

comparator reference pin. The current-shunt monitor

can measure differential voltage signals on common-

mode voltages that vary from –0.2 V up to 26 V,

independent of the supply voltage.

The open-drain alert output can be configured to

operate in two modes: transparent or latched. In

transparent mode, the output status follows the input

state. In latched mode, the alert output is cleared only

when the latch is reset. The standalone comparator

large-signal alert response time is less than 2 µs,

allowing for quick detection of overcurrent events.

The total system overcurrent protection response

time provided by the INA381-Q1 is less than 10 µs.

This device operates from a single 2.7-V to 5.5-V

supply, drawing a maximum supply current of 350 µA.

The device is specified over an operating temperature

range of –40°C to +125°C, and is available in the 10-

pin VSSOP package.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA381-Q1

VSSOP (10)

3.00 mm × 3.00 mm

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

at the end of the data sheet.

Typical Application