Power

Supply

(0V to 26V)

Load 1

Load 2

Power

Supply

(0V to 26V)

Load 3

Power

Supply

(0V to 26V)

0.1µF

Voltage)

CH 1

CH 2

CH 3

I

Interface

SDA

SCL

A0

Critical

Warning

GND

ADC

Shunt

Voltages 1-3

Critical Limit

Alerts 1-3

Bus

Voltages 1-3

Power Valid

Timing Control

Shunt Voltage

Sum Alerts

10kΩ

VPU

10kΩ

INA3221

www.ti.com

SBOS576 – MAY 2012

Triple-Channel, High-Side Measurement, Shunt and Bus Voltage Monitor

Check for Samples: INA3221

1

FEATURES

DESCRIPTION

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

23

•

Senses Bus Voltages From 0 V to +26 V

•

Reports Shunt and Bus Voltage

INA3221 monitors both shunt voltage drops and bus

•

High Accuracy:

supply voltages in addition to having programmable

conversion times and averaging modes for these

–

Offset Voltage: ±80 µV (max)

signals. The INA3221 offers both critical and warning

–

Gain Error: 0.25% (max)

alerts to detect multiple programmable out-of-range

•

Configurable Averaging Options

conditions for each channel.

•

Four Programmable Addresses

The INA3221 senses current on buses that can vary

•

Power-Supply Operation: 2.7 V to 5.5 V

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

•

Programmable Alert and Warning Outputs

(typ) of supply current. The INA3221 is specified over

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

APPLICATIONS

The

interface

features

four

programmable

•

Computers

addresses.

•

Power Management

RELATED PRODUCTS

•

Telecom Equipment

DESCRIPTION

DEVICE

•

Battery Chargers

High- or low-side, bi-directional current and

INA226

power monitor with two-wire interface

•

Power Supplies

Zero-drift, bi-directional current power monitor

•

Test Equipment

INA219

with two-wire interface

Current and power monitor with watchdog,

INA209

peak-hold, and fast comparator functions

Zero-drift, low-cost, analog current-shunt

INA210, INA211, INA212,

monitor series in small package

INA213, INA214

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.