INA225 Monitor Datasheet

INA225 Datasheet, PDF, Equivalent


Part Number

INA225

Description

Current-Shunt Monitor

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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INA225
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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
1 Wide Common-Mode Range: 0 V to 36 V
• Offset Voltage: ±150 μV (Max, All Gains)
• Offset Voltage Drift: 0.5 μV/°C (Max)
• Gain Accuracy, Over Temperature (Max):
– 25 V/V, 50 V/V: ±0.15%
– 100 V/V: ±0.2%
– 200 V/V: ±0.3%
– 10-ppm/°C Gain Drift
• 250-kHz Bandwidth (Gain = 25 V/V)
• Programmable Gains:
– G1 = 25 V/V
– G2 = 50 V/V
– G3 = 100 V/V
– G4 = 200 V/V
• Quiescent Current: 350 μA (Max)
• Package: MSOP-8
2 Applications
• Power Supplies
• Motor Control
• Computers
• Telecom Equipment
• Power Management
• Test and Measurement
3 Description
The INA225 is a voltage-output, current-sense
amplifier that senses drops across current-sensing
resistors at common-mode voltages that can vary
from 0 V to 36 V, independent of the supply voltage.
The device is a bidirectional, current-shunt monitor
that allows an external reference to be used to
measure current flowing in both directions across a
current-sensing resistor.
Four discrete gain levels are selectable using the two
gain-select terminals (GS0 and GS1) to program
gains of 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The
low-offset, zero-drift architecture and precision gain
values enable current-sensing with maximum drops
across the shunt as low as 10 mV of full-scale while
maintaining very high accuracy measurements over
the entire operating temperature range.
The device operates from a single +2.7-V to +36-V
power supply, drawing a maximum of 350 μA of
supply current. The device is specified over the
extended operating temperature range (–40°C to
+125°C), and is offered in an MSOP-8 package.
Device Information
ORDER NUMBER
PACKAGE
BODY SIZE
INA225AIDGK
MSOP (8)
3,0 mm x 3,0 mm
RSHUNT
Load
5-V Supply
INA225
IN-
IN+
-
+
VS
OUT
GAIN SELECT
GS0 GS1
GND
GND
VS
VS
GND
VS
GND
VS
GAIN
25
50
100
200
GS0
GS1
REF
GND
CBYPASS
0.1µ F
ADC
Microcontroller
GPIO
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.

INA225
INA225
SBOS612A – FEBRUARY 2014 – REVISED MARCH 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Terminal Configuration and Functions................ 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 Handling Ratings....................................................... 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 13
7.4 Device Functional Modes........................................ 16
8 Applications and Implementation ...................... 19
8.1 Application Information............................................ 19
8.2 Typical Applications ................................................ 19
9 Power Supply Recommendations...................... 25
10 Layout................................................................... 25
10.1 Layout Guidelines ................................................. 25
10.2 Layout Example .................................................... 25
11 Device and Documentation Support ................. 26
11.1 Related Documentation ....................................... 26
11.2 Trademarks ........................................................... 26
11.3 Electrostatic Discharge Caution ............................ 26
11.4 Glossary ................................................................ 26
12 Mechanical, Packaging, and Orderable
Information ........................................................... 26
4 Revision History
Changes from Original (February 2014) to Revision A
Page
• Made changes to product preview data sheet........................................................................................................................ 1
2 Submit Documentation Feedback
Product Folder Links: INA225
Copyright © 2014, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community INA225 SBOS612A – FEBRUARY 2014 – REVISED MARCH 2014 INA225 36- V, Programmable-Gain, Voltage-Output, B idirectional, Zero-Drift Series, Curren t-Shunt Monitor 1 Features •1 Wide C ommon-Mode Range: 0 V to 36 V • Offse t Voltage: ±150 μV (Max, All Gains) Offset Voltage Drift: 0.5 μV/°C (M ax) • Gain Accuracy, Over Temperature (Max): – 25 V/V, 50 V/V: ±0.15% – 100 V/V: ±0.2% – 200 V/V: ±0.3% 10-ppm/°C Gain Drift • 250-kHz Ban dwidth (Gain = 25 V/V) • Programmable Gains: – G1 = 25 V/V – G2 = 50 V/V – G3 = 100 V/V – G4 = 200 V/V • Quiescent Current: 350 μA (Max) • Pa ckage: MSOP-8 2 Applications • Power Supplies • Motor Control • Computer s • Telecom Equipment • Power Manag ement • Test and Measurement 3 Descr iption The INA225 is a voltage-output, current-sense amplifier that senses dro ps across current-sensing resistors at common-mode voltages that can vary from 0 V to 36 V, independent of the supply vo.
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