INA381 Amplifier Datasheet

INA381 Datasheet, PDF, Equivalent


Part Number

INA381

Description

Current Sense Amplifier

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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INA381
SBOS848B – DECEMBER 2017 – REVISED OCTOBER 2019
INA381 26-V, High-Speed, Current Sense Amplifier With Integrated Comparator
1 Features
1 Common-mode input range: –0.2 V to +26 V
• High accuracy amplifier:
– Offset voltage at TA = 25°C
– 500 µV (maximum) at VCM = 12 V
– 150 µV (maximum) at VCM = 0 V
– Offset voltage drift: 1 µV/°C (maximum)
– Gain error: 1% (maximum) at 25°C
– Gain error drift: 20 ppm/°C (maximum)
• Available amplifier gains:
– INA381A1: 20 V/V
– INA381A2: 50 V/V
– INA381A3: 100 V/V
– INA381A4: 200 V/V
• Open-drain comparator:
– Hysteresis: 50 mV
– Propagation delay: 400 ns (typ)
– Alert threshold set through external reference
voltage
– Supports transparent and latching modes
• Packages: VSSOP-10 and WSON-8
2 Applications
Merchant network and server PSU
Merchant DC/DC
DC-input BLDC motor drive
Cordless power tool
Headsets, headphones and earbuds
3 Description
The INA381 includes both a 26-V common-mode,
current-sensing amplifier and a high-speed
comparator. This device detects overcurrent
conditions by measuring the voltage developed
across a current-shunt resistor and comparing that
voltage to a user-defined threshold limit set by the
comparator reference pin. The current-shunt monitor
can measure differential voltage signals on common-
mode voltages that vary from –0.2 V up to 26 V,
independent of the supply voltage.
The open-drain alert output can be configured to
operate in two modes: transparent or latched. In
transparent mode, the output status follows the input
state. In latched mode, the alert output is cleared only
when the latch is reset. The standalone comparator
large-signal alert response time is less than 2 µs,
allowing for quick detection of overcurrent events.
The total system overcurrent protection response
time provided by the INA381 is less than 10 µs.
This device operates from a single 2.7-V to 5.5-V
supply, drawing a maximum supply current of 350 µA.
The device is specified over an operating temperature
range of –40°C to +125°C, and is available in 8-pin
WSON and 10-pin VSSOP packages.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA381
VSSOP (10)
WSON (8)
3.00 mm × 3.00 mm
2.00 mm × 2.00 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
0 V to 26 V
INA381
IN+
RSENSE
IN±
Load
Typical Application
VS+
2.7 V to 5.5 V
+
G = 20, 50,
100, 200
±
GND
5 V R1
VOUT
10 k:
RPULL-UP
Microcontroller
ADC
CMPIN
+
- ALERT
CMPREF
R2
RESET
GPIO
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.

INA381
INA381
SBOS848B – DECEMBER 2017 – REVISED OCTOBER 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 .............................................. 6
7 Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 17
8 Applications and Implementation ...................... 19
8.1 Application Information............................................ 19
8.2 Typical Applications ................................................ 25
9 Power Supply Recommendations...................... 29
10 Layout................................................................... 30
10.1 Layout Guidelines ................................................. 30
10.2 Layout Example .................................................... 30
11 Device and Documentation Support ................. 31
11.1 Documentation Support ........................................ 31
11.2 Receiving Notification of Documentation Updates 31
11.3 Support Resources ............................................... 31
11.4 Trademarks ........................................................... 31
11.5 Electrostatic Discharge Caution ............................ 31
11.6 Glossary ................................................................ 31
12 Mechanical, Packaging, and Orderable
Information ........................................................... 31
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (April 2018) to Revision B
Page
• Added DGS (VSSOP-8) package and associated content to data sheet ............................................................................. 1
• Added specified temperature to offset voltage and gain error features bullets...................................................................... 1
• Changed response time features bullet at 500 ns to propagation delay at 400 ns................................................................ 1
• Changed applications bullets to new items ............................................................................................................................ 1
• Added plus-minus symbol to TYP and MAX values of comparator offset voltage ................................................................. 5
• Changed Figure 54 to remove reset connection to supply................................................................................................... 30
Changes from Original (December 2017) to Revision A
Page
• Released to production .......................................................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: INA381
Copyright © 2017–2019, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity INA381 SBOS848B – DECEMBER 20 17 – REVISED OCTOBER 2019 INA381 26-V , High-Speed, Current Sense Amplifier W ith Integrated Comparator 1 Features 1 Common-mode input range: –0.2 V t o +26 V • High accuracy amplifier: Offset voltage at TA = 25°C – 500 µV (maximum) at VCM = 12 V – 150 µV (maximum) at VCM = 0 V – Offset volt age drift: 1 µV/°C (maximum) – Gain error: 1% (maximum) at 25°C – Gain error drift: 20 ppm/°C (maximum) • A vailable amplifier gains: – INA381A1: 20 V/V – INA381A2: 50 V/V – INA381 A3: 100 V/V – INA381A4: 200 V/V • O pen-drain comparator: – Hysteresis: 5 0 mV – Propagation delay: 400 ns (typ ) – Alert threshold set through exter nal reference voltage – Supports tran sparent and latching modes • Packages : VSSOP-10 and WSON-8 2 Applications Merchant network and server PSU • M erchant DC/DC • DC-input BLDC motor drive • Cordless power tool • Headsets, headphones and earbuds 3 Description The .
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