INA302 Amplifiers Datasheet

INA302 Datasheet, PDF, Equivalent


Part Number

INA302

Description

Current-Sense Amplifiers

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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INA302, INA303
SBOS775C – SEPTEMBER 2016 – REVISED MARCH 2019
INA30x 36-V, Overcurrent Protection, Precision,
Current-Sense Amplifiers With Dual Integrated Comparators
1 Features
1 Wide common-mode input range: –0.1 V to +36 V
• Dual comparator outputs:
– INA302: Two independent overlimit alerts
– INA303: Window comparator
– Threshold levels set individually
– Comparator 1 alert response: 1 µs
– Comparator 2 adjustable delay: 2 µs to 10 s
– Open-drain outputs with independent latch
control modes
• High accuracy amplifier:
– Offset voltage: 30 µV (max, A3 version)
– Offset voltage drift: 0.5 µV/°C (max)
– Gain error: 0.15% (max, A3 version)
– Gain error drift: 10 ppm/°C
• Available amplifier gains:
– INA302A1, INA303A1: 20 V/V
– INA302A2, INA303A2: 50 V/V
– INA302A3, INA303A3: 100 V/V
2 Applications
• Overcurrent protection
• Motor control
• Power-supply protection
• Computers and servers
• Telecom equipment
3 Description
The INA302 and INA303 (INA30x) devices feature a
high common-mode, bidirectional, current-sensing
amplifier and two high-speed comparators to detect
out-of-range current conditions. The INA302
comparators are configured to detect and respond to
overcurrent conditions. The INA303 comparators are
configured to respond to both overcurrent and
undercurrent conditions in a windowed configuration.
These devices feature an adjustable limit threshold
range for each comparator set using an external limit-
setting resistor. These current-shunt monitors can
measure differential voltage signals on common-
mode voltages that can vary from –0.1 V up to +36 V,
independent of the supply.
The open-drain alert outputs can be configured to
operate in either a transparent mode (output status
follows the input state), or in a latched mode (alert
output is cleared when the latch is reset). The alert
response time for comparator 1 is under 1 µs, and
the alert response for comparator 2 is set through an
external capacitor ranging from 2 µs to 10 s.
These devices operate from a single 2.7-V to 5.5-V
supply, drawing a maximum supply current of 950 μA.
The devices are specified over the extended
operating temperature range of –40°C to +125°C, and
are available in a 14-pin TSSOP package.
PART NUMBER
INA302
INA303
Device Information
PACKAGE
BODY SIZE (NOM)
TSSOP (14)
4.40 mm × 5.00 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
Typical Application
2.7 V to 5.5 V
CBYPASS
Supply
(0 V to 36 V)
Load
INA30x
IN+ +
IN-
0.1 F
VS
COMP1
+
COMP2
-(+)
+ (-)
GND
Reference Voltage
LIMIT1
RLIMIT1
ALERT1
LATCH1
OUT
RPULL-UP
10 k
Microcontroller
GPIO
GPIO
ADC
ALERT2
LATCH2
DELAY
LIMIT2
RLIMIT2
GPIO
GPIO
CDELAY
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.

INA302
INA302, INA303
SBOS775C – SEPTEMBER 2016 – REVISED MARCH 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD 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 ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 14
7.3 Feature Description................................................. 15
7.4 Device Functional Modes........................................ 21
8 Application and Implementation ........................ 23
8.1 Application Information .......................................... 23
8.2 Typical Application .................................................. 29
9 Power Supply Recommendations...................... 31
10 Layout................................................................... 31
10.1 Layout Guidelines ................................................. 31
10.2 Layout Example .................................................... 32
11 Device and Documentation Support ................. 33
11.1 Documentation Support ....................................... 33
11.2 Related Links ........................................................ 33
11.3 Receiving Notification of Documentation Updates 33
11.4 Community Resources.......................................... 33
11.5 Trademarks ........................................................... 33
11.6 Electrostatic Discharge Caution ............................ 33
11.7 Glossary ................................................................ 33
12 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (April 2017) to Revision C
Page
• Changed locations and text of some sections for clarity; no content was changed............................................................... 1
• Added MIN and MAX values to VCM and VS rows of Recommended Operating Conditions table......................................... 4
• Deleted VCM, VS, and temperature range rows from Electrical Characteristics table; same content listed in
Recommended Operating Conditions table............................................................................................................................ 5
Changes from Revision A (February 2017) to Revision B
Page
• Changed y-axis units from 0.5 V/div to 1 V/div and changed (INA30xA1) to (INA30x) in title of Comparator 1 Total
Propagation Delay figure ...................................................................................................................................................... 12
• Changed y-axis units from 0.5 V/div to 1 V/div and changed (INA303A1) to (INA303) in title of Comparator 2 Total
Propagation Delay figure ...................................................................................................................................................... 12
• Deleted Comparator 1 Total Propagation Delay (INA30xA2), Comparator 1 Total Propagation Delay (INA30xA3),
Comparator 2 Total Propagation Delay (INA303A2), and Comparator 2 Total Propagation Delay (INA303A3) figures ..... 12
• Changed (INA303A1) to (INA303) in title of Comparator 2 Total Propagation Delay figure ................................................ 12
• Deleted Comparator 2 Total Propagation Delay (INA303A2) and Comparator 2 Total Propagation Delay (INA303A3)
figures ................................................................................................................................................................................... 12
• Added Comparator 2 Total Propagation Delay (INA302A1) and Comparator 2 Total Propagation Delay (INA302A1)
figures ................................................................................................................................................................................... 12
Changes from Original (September 2016) to Revision A
Page
• Released to production .......................................................................................................................................................... 1
2 Submit Documentation Feedback
Copyright © 2016–2019, Texas Instruments Incorporated
Product Folder Links: INA302 INA303


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity INA302, INA303 SBOS775C – SEP TEMBER 2016 – REVISED MARCH 2019 INA3 0x 36-V, Overcurrent Protection, Precis ion, Current-Sense Amplifiers With Dual Integrated Comparators 1 Features • 1 Wide common-mode input range: –0.1 V to +36 V • Dual comparator outputs: – INA302: Two independent overlimit alerts – INA303: Window comparator Threshold levels set individually – Comparator 1 alert response: 1 µs – Comparator 2 adjustable delay: 2 µs t o 10 s – Open-drain outputs with inde pendent latch control modes • High ac curacy amplifier: – Offset voltage: 3 0 µV (max, A3 version) – Offset volt age drift: 0.5 µV/°C (max) – Gain e rror: 0.15% (max, A3 version) – Gain error drift: 10 ppm/°C • Available a mplifier gains: – INA302A1, INA303A1: 20 V/V – INA302A2, INA303A2: 50 V/V – INA302A3, INA303A3: 100 V/V 2 Appli cations • Overcurrent protection • Motor control • Power-supply protection • Computers and servers • Telecom .
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