ADC

Load

Microcontroller

GPIO

0.1µF

5-V Supply

-

+

IN-

IN+

REF

GND

GS0

GS1

OUT

INA225

GAIN SELECT

GS0

GS1

GAIN

GND

GND

VS

VS

VS

VS

GND

GND

25

50

100

200

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INA225

SBOS612A – FEBRUARY 2014 – REVISED MARCH 2014

INA225 36-V, Programmable-Gain, Voltage-Output, Bidirectional, Zero-Drift Series,

Current-Shunt Monitor

1 Features

3 Description

The

INA225

is

a

voltage-output,

current-sense

1

•

Wide Common-Mode Range: 0 V to 36 V

amplifier that senses drops across current-sensing

•

Offset Voltage: ±150

μV (Max, All Gains)

resistors at common-mode voltages that can vary

•

Offset Voltage Drift: 0.5

μV/°C (Max)

from 0 V to 36 V, independent of the supply voltage.

The device is a bidirectional, current-shunt monitor

•

Gain Accuracy, Over Temperature (Max):

that allows an external reference to be used to

–

25 V/V, 50 V/V: ±0.15%

measure current flowing in both directions across a

–

100 V/V: ±0.2%

current-sensing resistor.

–

200 V/V: ±0.3%

Four discrete gain levels are selectable using the two

–

10-ppm/°C Gain Drift

gain-select terminals (GS0 and GS1) to program

gains of 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The

•

250-kHz Bandwidth (Gain = 25 V/V)

low-offset, zero-drift architecture and precision gain

•

Programmable Gains:

values enable current-sensing with maximum drops

–

G1 = 25 V/V

across the shunt as low as 10 mV of full-scale while

maintaining very high accuracy measurements over

–

G2 = 50 V/V

the entire operating temperature range.

–

G3 = 100 V/V

The device operates from a single +2.7-V to +36-V

–

G4 = 200 V/V

power supply, drawing a maximum of 350

μA of

•

Quiescent Current: 350

μA (Max)

supply current. The device is specified over the

•

Package: MSOP-8

extended operating temperature range (–40°C to

+125°C), and is offered in an MSOP-8 package.

2 Applications

Device Information

•

Power Supplies

ORDER NUMBER

PACKAGE

BODY SIZE

•

Motor Control

INA225AIDGK

MSOP (8)

3,0 mm x 3,0 mm

•

Computers

•

Telecom Equipment

•

Power Management

•

Test and Measurement

1

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.