Power Supply

(0 V to 26 V)

Load 1

Load 2

Power Supply

(0 V to 26 V)

Load 3

Power Supply

(0 V to 26 V)

0.1 µF

Voltage)

CH 1

CH 2

CH 3

I

and

SMBus-

Compatible

Interface

SDA

SCL

A0

Critical

Warning

GND

ADC

Shunt

Voltages 1-3

Critical Limit

Alerts 1-3

Bus

Voltages 1-3

Power Valid (PV)

Timing Control (TC)

Shunt Voltage

Sum Alerts

10 k

VPU

10 k

Product

Folder

Sample &

Buy

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.

INA3221

SBOS576B – MAY 2012 – REVISED MARCH 2016

INA3221 Triple-Channel, High-Side Measurement,

1

1 Features

1

•

Senses Bus Voltages From 0 V to 26 V

•

Reports Shunt and Bus Voltage

•

High Accuracy:

–

Offset Voltage: ±80 µV (max)

–

Gain Error: 0.25% (max)

•

Configurable Averaging Options

•

Four Programmable Addresses

•

Programmable Alert and Warning Outputs

•

Power-Supply Operation: 2.7 V to 5.5 V

2 Applications

•

Computers

•

Power Management

•

Telecom Equipment

•

Battery Chargers

•

Power Supplies

•

Test Equipment

3 Description

The INA3221 is a three-channel, high-side current

compatible interface. The INA3221 monitors both

shunt voltage drops and bus supply voltages, in

addition to having programmable conversion times

and averaging modes for these signals. The INA3221

offers both critical and warning alerts to detect

multiple programmable out-of-range conditions for

each channel.

The INA3221 senses current on buses that can vary

from 0 V to 26 V. The device is powered from a

single 2.7-V to 5.5-V supply, and draws 350

μA (typ)

of supply current. The INA3221 is specified over the

operating temperature range of –40°C to +125°C.

four programmable addresses.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA3221

VQFN (16)

4.00 mm x 4.00 mm

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

at the end of the datasheet.

Typical Application