Sense Amplifier. INA381 Datasheet

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INA381 Datasheet
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Part INA381
Description Current Sense Amplifier
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Texas Instruments INA381
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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.



Texas Instruments 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



Texas Instruments INA381
www.ti.com
5 Pin Configuration and Functions
DGS Package
10-Pin VSSOP
Top View
INA381
SBOS848B – DECEMBER 2017 – REVISED OCTOBER 2019
DSG Package
8-Pin WSON
Top View
IN+
VS+
ALERT
RESET
GND
1
2
3
4
5
10 IN±
9 VOUT
8 CMPIN
7 CMPREF
6 NC
IN+
VS+
ALERT
RESET
18
27
Thermal Pad
36
45
IN±
VOUT
CMPIN
CMPREF
NAME
ALERT
CMPIN
CMPREF
GND
IN–
IN+
NC
RESET
VOUT
VS+
Thermal
Pad
Not to scale
Not to scale
PIN
DGS
3
8
7
5
10
1
6
4
9
2
DSG
3
6
5
8
1
4
7
2
Thermal
Pad
Pin Functions
TYPE
DESCRIPTION
Digital output
Analog input
Analog input
Ground
Analog input
Analog input
Digital input
Analog output
Supply
Overlimit alert, active low, open-drain output
Signal input to the comparator
Input reference to the comparator
Device ground. Connect the thermal pad to the system ground. See the layout
example in Figure 54.
Connect this pin to the load side of the shunt resistor
Connect this pin to the supply side of the shunt resistor
Not internal connection to device. This pin can be left floating, grounded, or
connected to the supply.
Transparent or latch mode selection input. See the Alert Modes section for a
detailed description on pin connections.
Current-sense amplifier output voltage
Power supply: 2.7 V to 5.5 V
Ground reference for the device that is also the thermal pad used to conduct heat
from the device. Tie this pad externally to ground.
Copyright © 2017–2019, Texas Instruments Incorporated
Product Folder Links: INA381
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