Order
Now
Product
Folder
Support &
Community
Tools &
Software
Technical
Documents
Reference
Design
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
INA1x9 High-Side Measurement Current Shunt Monitor
1 Features
3 Description
•
The INA139 and INA169 are high-side, unipolar,
current shunt monitors. Wide input common-mode
voltage range, high-speed, low quiescent current, and
tiny SOT-23 packaging enable use in a variety of
applications.
1
•
•
•
•
•
•
•
Complete Unipolar High-Side Current
Measurement Circuit
Wide Supply and Common-Mode Range
INA139: 2.7 V to 40 V
INA169: 2.7 V to 60 V
Independent Supply and Input Common-Mode
Voltages
Single Resistor Gain Set
Low Quiescent Current: 60 µA (Typical)
5-Pin, SOT-23 Packages
Input common-mode and power-supply voltages are
independent and can range from 2.7 V to 40 V for the
INA139 and 2.7 V to 60 V for the INA169. Quiescent
current is only 60 µA, which permits connecting the
power supply to either side of the current
measurement shunt with minimal error.
The device converts a differential input voltage to a
current output. This current is converted back to a
voltage with an external load resistor that sets any
gain from 1 to over 100. Although designed for
current shunt measurement, the circuit invites
creative applications in measurement and level
shifting.
2 Applications
•
•
•
•
•
•
Current Shunt Measurement:
– Automotive, Telephone, Computers
Portable and Battery-Backup Systems
Battery Chargers
Power Management
Cell Phones
Precision Current Source
Both the INA139 and INA169 are available in 5-pin
SOT-23 packages. The INA139 device is specified for
the –40°C to +125°C temperature range, and the
INA169 is specified from –40°C to +85°C.
Device Information(1)
PART NUMBER
INA139
PACKAGE
SOT-23 (5)
INA169
BODY SIZE (NOM)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
IS
RS
VIN+
Up to 60 V
4
3
VIN+
VIN–
1kΩ
Load
1kΩ
V+
5
OUT
GND
2
VO = ISRSRL/1kΩ
1
RL
Copyright © 2017, Texas Instruments Incorporated
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.
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
4
4
4
5
6
7
Absolute Maximum Ratings ......................................
ESD Ratings ............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Typical Characteristics ..............................................
Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................... 9
7.4 Device Functional Modes........................................ 10
8
Application and Implementation ........................ 11
8.1 Application Information............................................ 11
8.2 Typical Applications ............................................... 12
9 Power Supply Recommendations...................... 18
10 Layout................................................................... 19
10.1 Layout Guidelines ................................................. 19
10.2 Layout Example .................................................... 19
11 Device and Documentation Support ................. 20
11.1
11.2
11.3
11.4
11.5
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
20
20
20
20
20
12 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (December 2015) to Revision F
Page
•
Changed INA139 maximum temperature specification from +85°C to +125°C in Description section ................................. 1
•
Changed INA139 device maximum temperature specification from +85°C to +125°C in Description section ...................... 1
•
Updated Typical Application Circuit graphic on front page with 2017 copyright ................................................................... 1
•
Updated pinout diagram in Pin Configurations and Functions section .................................................................................. 3
•
Reformatted Recommended Operating Conditions table ...................................................................................................... 4
•
Changed common-mode rejection minimum value from 100 dB to 99 dB in the Electrical Characteristics table ................. 6
•
Changed offset voltage maximum value from ±1 mV to ±1.5 mV in the Electrical Characteristics table............................... 6
•
Changed INA139 nonlinearity error maximum value from ±0.1% to ± 0.13% in the Electrical Characteristics table ............ 6
•
Changed maximum value of INA139 temperature range specification from 85°C to 125°C in the Electrical
Characteristics table ............................................................................................................................................................... 6
•
Added updated copyright statement to Functional Block Diagram ....................................................................................... 9
Changes from Revision D (November 2005) to Revision E
•
2
Page
Changed ESD Ratings table, Feature Description section, Device Functional Modes, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section ............................................................... 1
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
5 Pin Configuration and Functions
DBV Package
5-Pin SOT-23
Top View
OUT
1
GND
2
VIN+
3
5
V+
4
VIN±
Not to scale
Pin Functions
PIN
NAME
NO.
I/O
DESCRIPTION
GND
2
—
Ground
OUT
1
O
Output current
VIN+
3
I
Positive input voltage
VIN–
4
I
Negative input voltage
V+
5
I
Power supply voltage
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
3
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
INA139
Supply voltage, VS
INA169
Common-mode
Analog inputs, INA139
Differential (VIN+) – (VIN–)
Common-mode
Analog inputs, INA169
Analog input, out
(2)
(2)
Differential (VIN+) – (VIN–)
(2)
MIN
MAX
UNIT
–0.3
60
V
–0.3
75
V
–0.3
60
V
–40
2
V
–0.3
75
V
–40
2
V
–0.3
40
V
10
mA
–55
125
°C
150
°C
125
°C
Input current into any pin
Operating temperature, TA
Junction temperature, TJ
Storage temperature, Tstg
(1)
(2)
–65
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The input voltage at any pin may exceed the voltage shown if the current at that pin is limited to 10 mA.
6.2 ESD Ratings
VALUE
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001
V(ESD)
(1)
(2)
Electrostatic discharge
(1)
UNIT
±1000
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
V
±500
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
V+
Power-supply voltage
Common-mode voltage
4
MIN
NOM
MAX
INA139
2.7
5
40
INA169
2.7
5
60
INA139
2.7
12
40
INA169
2.7
12
60
Submit Documentation Feedback
UNIT
V
V
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
6.4 Thermal Information
INA1x9
THERMAL METRIC (1)
DBV (SOT-23)
UNIT
5 PINS
RθJA
Junction-to-ambient thermal resistance
168.3
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
73.8
°C/W
RθJB
Junction-to-board thermal resistance
28.1
°C/W
ψJT
Junction-to-top characterization parameter
2.5
°C/W
ψJB
Junction-to-board characterization parameter
27.6
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
5
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
6.5 Electrical Characteristics
INA139: all other characteristics at TA = –40°C to +125°C, V+ = 5 V, VIN+ = 12 V, and ROUT = 25 kΩ, unless otherwise noted
INA169: all other characteristics at TA = –40°C to +85°C V+ = 5 V, VIN+ = 12 V, and ROUT = 25 kΩ, unless otherwise noted
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
100
500
mV
INPUT
Full-scale sense voltage
Common-mode input range
Common-mode rejection
Offset voltage
(1)
RTI
vs. temperature
vs power supply (V+)
VSENSE = VIN+ – VIN–
INA139
2.7
40
INA169
2.7
60
INA139:
VIN+ = 2.7 V to 40 V, VSENSE = 50 mV
99
115
dB
INA169:
VIN+ = 2.7 V to 60 V, VSENSE = 50 mV
100
120
dB
INA139
±0.2
±1.5
INA169
±0.2
±1
TMIN to TMAX
1
V
mV
µV/°C
INA139:
V+ = 2.7 V to 40 V, VSENSE = 50 mV
0.5
10
µV/V
INA169:
V+ = 2.7 V to 60 V, VSENSE = 50 mV
0.1
10
µV/V
Input bias current
10
µA
OUTPUT
Transconductance vs temperature
VSENSE = 10 mV – 150 mV
990
VSENSE = 10 mV
Nonlinearity error
VSENSE = 10 mV to 150
mV
Total output error
VSENSE = 100 mV
1010
10
µA/V
nA/°C
INA139
±0.01%
±0.13%
INA169
±0.01%
±0.1%
±0.5%
±2%
Output impedance
Voltage output
1000
1 || 5
GΩ || pF
Swing to power supply, V+
(V+) – 0.9
(V+) – 1.2
Swing to common-mode, VCM
VCM – 0.6
VCM – 1
V
FREQUENCY RESPONSE
Bandwidth
Settling time (0.1%)
ROUT = 10 kΩ
440
kHz
ROUT = 20 kΩ
220
kHz
5-V step, ROUT = 10 kΩ
2.5
µs
5-V step, ROUT = 20 kΩ
5
µs
20
pA/√Hz
7
nA RMS
NOISE
Output-current noise density
Total output-current noise
BW = 100 kHz
POWER SUPPLY
Operating range, V+
Quiescent current
INA139
2.7
INA169
2.7
VSENSE = 0, IO = 0
40
60
V
60
V
125
µA
125
°C
TEMPERATURE RANGE
Specification, TMIN to TMAX
INA139
–40
INA169
–40
85
°C
Operating
–55
125
°C
Storage
–65
150
°C
Thermal resistance, θJA
(1)
6
200
°C/W
Defined as the amount of voltage (VSENSE) to drive the output to zero.
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
6.6 Typical Characteristics
at TA = 25°C, V+ = 5 V, VIN+ = 12 V, and RL = 125 kΩ, unless otherwise noted.
120
40
Common-Mode Rejection (dB)
RL = 100 kΩ
30
RL = 10 kΩ
Gain (dB)
20
10
RL = 1 kΩ
0
–10
G = 100
100
80
G = 10
60
G=1
40
20
0
–20
100
10k
1k
100k
0.1
10M
1M
10
1
100
10k
1k
100k
Frequency (Hz)
Frequency (Hz)
Figure 1. Gain vs Frequency
Figure 2. Common-Mode Rejection vs Frequency
5
140
VIN = (VIN+ − VIN−)
–55°C
Total Output Error (%)
120
G = 100
PSR (dB)
100
G = 10
80
G=1
60
0
+150°C
–5
+25°C
–10
40
–15
20
1
100
10
1k
25
0
100k
10k
50
Frequency (Hz)
100
125
150
200
VIN (mV)
Figure 3. Power-Supply Rejection vs Frequency
Figure 4. Total Output Error vs VIN
2
100
Output error is essentially
independent of both
V+ supply voltage and
input common-mode voltage.
1
Quiescent Current (μA)
Total Output Error (%)
75
G=1
0
G = 10
G = 25
–1
–2
+150°
80
+125°
60
+25°
40
–55°
20
Use the INA169 with
(V+) > 40V
0
0
10
20
30
40
50
60
70
0
10
Power-Supply Voltage (V)
20
30
40
50
60
70
Power-Supply Voltage (V)
Output error is essentially independent both of V+ supply voltage and
input common-mode voltage.
Figure 5. Total Output Error vs Power-Supply Voltage
Figure 6. Quiescent Current vs Power-Supply Voltage
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
7
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
Typical Characteristics (continued)
at TA = 25°C, V+ = 5 V, VIN+ = 12 V, and RL = 125 kΩ, unless otherwise noted.
1.5V
1V
G = 100
G = 50
0.5V
0V
1V
2V
G = 100
G = 10
0V
0V
20µs/div
10µs/div
Figure 7. Step Response
8
Figure 8. Step Response
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
7 Detailed Description
7.1 Overview
The INA139 and INA169 devices are comprised of a high voltage, precision operational amplifier, precision thin
film resistors trimmed in production to an absolute tolerance and a low noise output transistor. The INA139 and
INA169 devices can be powered from a single power supply and their input voltages can exceed the power
supply voltage. The INA139 and INA169 devices are ideal for measuring small differential voltages, such as
those generated across a shunt resistor in the presence of large, common-mode voltages. See the Functional
Block Diagram, which illustrates the functional components within both the INA139 and INA169 devices.
7.2 Functional Block Diagram
VIN+
VIN-
V+
+
OUT
GND
Copyright © 2017, Texas Instruments Incorporated
7.3 Feature Description
7.3.1 Output Voltage Range
The output of the INA139 is a current, which is converted to a voltage by the load resistor (RL). The output
current remains accurate within the compliance voltage range of the output circuitry. The shunt voltage and the
input common-mode and power-supply voltages limit the maximum possible output swing. The maximum output
voltage compliance is limited by the lower of Equation 1 and Equation 2.
V OUTMAX
V
0.7 V
V IN
V IN
(1)
or whichever is lower
V OUTMAX
V IN
0.5 V
(2)
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
9
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
Feature Description (continued)
7.3.2 Bandwidth
Measurement bandwidth is affected by the value of the load resistor (RL). High gain produced by high values of
RL yield a narrower measurement bandwidth (see the Typical Characteristics graphs). For widest possible
bandwidth, keep the capacitive load on the output to a minimum. Reduction in bandwidth due to capacitive load
is shown in the Typical Characteristics graphs.
If bandwidth limiting (filtering) is desired, a capacitor can be added to the output (see Figure 12). This does not
cause instability.
7.4 Device Functional Modes
For proper operation the INA139 and INA169 devices must operate within their specified limits. Operating either
device outside of their specified power supply voltage range or their specified common-mode range results in
unexpected behavior and is not recommended. Additionally operating the output beyond their specified limits with
respect to power supply voltage and input common-mode voltage will also produce unexpected results. See the
Electrical Characteristics table for device specifications.
10
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
8.1.1 Operation
Figure 9 illustrates the basic circuit diagram for both the INA139 and INA169. Load current IS is drawn from
supply VS through shunt resistor RS. The voltage drop in shunt resistor VS is forced across RG1 by the internal
operational amplifier, causing current to flow into the collector of Q1. The external resistor RL converts the output
current to a voltage, VOUT, at the OUT pin.
The transfer function for the INA139 is given by Equation 3:
IO
g m V IN
V IN
where
•
gm = 1000 µA/V
(3)
In the circuit of Figure 9, the input voltage (VIN+ – VIN–) is equal to IS × RS and the output voltage(VOUT) is equal
to IO × RL. The transconductance (gm) of the INA139 is 1000 µA/V. The complete transfer function for the current
measurement amplifier in this application is given by Equation 4:
V OUT
I S R S 1000 µA / V R L
(4)
The maximum differential input voltage for accurate measurements is 0.5 V, which produces a 500-µA output
current. A differential input voltage of up to 2 V will not cause damage. Differential measurements (pins 3 and 4)
must be unipolar with a more-positive voltage applied to pin 3. If a more-negative voltage is applied to pin 3, the
output current, IO, is zero, but it will not cause damage.
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
11
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
Application Information (continued)
VP
Load Power Supply
2.7 V to 40 V (1)
V+ power can be
common or
independent of
load supply.
Shunt
RS
VIN+
IS
VIN–
4
3
Load
V+
RG1
1kΩ
RG2
1kΩ
2.7 V≤ (V+) ≤ 40 V(1)
5
Q1
VOLTAGE GAIN
(1)
EXACT R L ( Ω )
NEAREST 1% R
1
1k
1k
2
2k
2k
5
5k
4.99k
10
10k
10k
20
20k
20k
50
50k
49k
100
100k
100k
L
(Ω )
INA139
2
OUT
1
+
IO
RL
VO
–
Copyright © 2017, Texas Instruments Incorporated
For the INA169 device, maximum VP and V+ voltage is 60 V.
Figure 9. Basic Circuit Connections
8.2 Typical Applications
The INA139 is designed for current shunt measurement circuits, as shown in Figure 9, but its basic function is
useful in a wide range of circuitry. A creative engineer will find many unforeseen uses in measurement and level
shifting circuits. A few ideas are illustrated in Figure 14 through Figure 18.
8.2.1 Buffering Output to Drive an ADC
IS
3
4
INA139
OPA340
ZIN
RL
Copyright © 2017, Texas Instruments Incorporated
(1)
Buffer of amp drives the A/D converter without effecting gain
Figure 10. Buffering Output to Drive the A/D Converter
8.2.1.1 Design Requirements
Digitize the output of the INA139 or INA169 devices using a 1-MSPS analog-to-digital converter (ADC).
12
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
Typical Applications (continued)
8.2.1.2 Detailed Design Procedure
8.2.1.2.1 Selecting RS and RL
In Figure 9 the value selected for the shunt resistor ( RS) depends on the application and is a compromise
between small-signal accuracy and maximum permissible voltage loss in the measurement line. High values of
RS provide better accuracy at lower currents by minimizing the effects of offset, while low values of RS minimize
voltage loss in the supply line. For most applications, best performance is attained with an RS value that provides
a full-scale shunt voltage of 50 mV to 100 mV; maximum input voltage for accurate measurements is 500 mV.
RL is selected to provide the desired full-scale output voltage. The output impedance of the INA139 and INA169
OUT terminal is very high, which permits using values of RL up to 100 kΩ with excellent accuracy. The input
impedance of any additional circuitry at the output must be much higher than the value of RL to avoid degrading
accuracy.
Some analog-to-digital converters (ADCs) have input impedances that significantly affect measurement gain. The
input impedance of the ADC can be included as part of the effective RL if the input can be modeled as a resistor
to ground. Alternatively, an operational amplifier can be used to buffer the ADC input, as shown in Figure 10. The
INA139 and INA169 are current output devices, and have an inherently large output impedance. The output
currents from the amplifier are converted to an output voltage through the load resistor (RL) connected from the
amplifier output to ground. The ratio of the load resistor value to that of the internal resistor value determines the
voltage gain of the system.
In many applications, digitizing the output of the INA139 or INA169 devices is required. This is accomplished by
connecting the output of the amplifier to an ADC. It is very common for an ADC to have a dynamic input
impedance. If the INA139 or INA169 output is connected directly to an ADC input, the input impedance of the
ADC is effectively connected in parallel with the gain setting resistor (RL.) This parallel impedance combination
affects the gain of the system and the impact on the gain is difficult to estimate accurately. A simple solution that
eliminates the paralleling of impedances, simplifying the gain of the circuit is to place a buffer amplifier (such as
the OPA340) between the output of the INA139 or INA169 devices and the input to the ADC.
Figure 10 illustrates this concept. A low-pass filter can be placed between the OPA340 output and the input to
the ADC. The filter capacitor is required to provide any instantaneous demand for current required by the input
stage of the ADC. The filter resistor is required to isolate the OPA340 output from the filter capacitor to maintain
circuit stability. The values for the filter components vary according to the operational amplifier used for the buffer
and the particular ADC selected. For more information regarding the design of the low-pass filter, see the 16-bit
1-MSPS Data Acquisition Reference Design for Single-Ended Multiplexed Applications TI Precision Design.
Figure 11 shows the expected results when driving an analog-to-digital converter at 1 MSPS with and without
buffering the INA139 or INA169 output. Without the buffer, the high impedance of the INA139 or INA169 reacts
with the input capacitance and sample and hold (S/H) capacitance of the analog-to-digital converter and does not
allow the S/H to reach the correct final value before the S/H resets and the next conversion starts. Adding the
buffer amplifier significantly reduces the output impedance driving the S/H and allows for higher conversion rates
than can be achieved without adding the buffer.
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
13
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
Typical Applications (continued)
8.2.1.3 Application Curve
Input to ADC (0.25 V/div)
with buffer
without Buffer
Time
Figure 11. Driving an ADC With and Without a Buffer
8.2.2 Output Filter
3
4
f–3dB
INA139
f–3dB =
1
2pRLCL
VO
RL
CL
Copyright © 2017, Texas Instruments Incorporated
Figure 12. Output Filter
8.2.2.1 Design Requirements
Filter the output of the INA139 or INA169 devices.
8.2.2.2 Detailed Design Procedure
A low-pass filter can be formed at the output of the INA139 or INA169 devices simply by placing a capacitor of
the desired value in parallel with the load resistor. First, determine the value of the load resistor required to
achieve the desired gain. See the table in Figure 9. Next, determine the capacitor value that results in the
desired cutoff frequency according to the equation shown in Figure 12. Figure 13 illustrates various combinations
of gain settings (determined by RL) and filter capacitors.
14
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
Typical Applications (continued)
8.2.2.3 Application Curve
40
RL = 100 kΩ
30
RL = 10 kΩ
Gain (dB)
20
10
RL = 1 kΩ
0
–10
–20
100
1k
10k
100k
10M
1M
Frequency (Hz)
Figure 13. Gain vs Frequency
8.2.3 Offsetting the Output Voltage
For many applications using only a single power supply, it may be required to level shift the output voltage away
from ground when there is no load current flowing in the shunt resistor. Level shifting the output of the INA139 or
INA169 devices is easily accomplished by one of two simple methods shown in Figure 14. The method on the
left hand side of Figure 14 illustrates a simple voltage divider method. This method is useful for applications that
require the output of the INA139 or INA169 devices to remain centered with respect to the power supply at zero
load current through the shunt resistor. Using this method the gain is determined by the parallel combination of
R1 and R2, while the output offset is determined by the voltage divider ratio R1 and R2. For applications that may
require a fixed value of output offset independent of the power supply voltage, TI recommends using the current
source method shown on the right hand side of Figure 14 . With this method, a REF200 constant current source
is used to generate a constant output offset. Using this method. the gain is determined by RL and the offset is
determined by the product of the value of the current source and RL.
3
4
3
VR
INA139
4
REF200
100 µA
INA139
R1
VO
1
V+
VO
1
R2
RL
Copyright © 2017, Texas Instruments Incorporated
(1)
Gain set by R1 || R2. Output offset = (VR) R2 / (R1 + R2) using resistor divider.
(2)
Gain set by RL. Output offset = 100 µA × RL (independent of V+) using current source.
Figure 14. Offsetting the Output Voltage
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
15
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
Typical Applications (continued)
8.2.4 Bipolar Current Measurement
The INA139 or INA169 devices can be configured as shown in Figure 15 in applications where measuring current
bi-directionally is required. Two INA devices are required connecting their inputs across the shunt resistor as
shown in Figure 15. A comparator, such as the TLV3201, is used to detect the polarity of the load current. The
magnitude of the load current is monitored across the resistor connected between ground and the connection
labeled Output. In this example the 20-kΩ resistor results in a gain of 20 V/V. The 10-kΩ resistors connected in
series with the INA139 or INA169 output current are used to develop a voltage across the comparator inputs.
Two diodes are required to prevent current flow into the INA139 or INA169 output, as only one device at a time is
providing current to the Output connection of the circuit. The circuit functionality is illustrated in Figure 16.
+/-1 A
Load Curent
RSH
1
VIN+
VIN-
VIN-
VIN+
Bus
Voltage
1k
5V
1k
1k
V+
+5 V
V+
+
+
INA139
or
INA169
Load
Current
1k
OUT
OUT
GND
GND
1N4148
INA139
or
INA169
1N4148
+
Sign
TLV3201
10 k
10 k
Output
20 k
Copyright © 2017, Texas Instruments Incorporated
Figure 15. Bipolar Current Measurement
16
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
Typical Applications (continued)
8.2.4.1 Application Curve
Voltage
Load Current
Output
Sign
Time
Figure 16. Bipolar Current Measurement Results (Arbitrary Scale)
8.2.5 Bipolar Current Measurement Using a Differential Input of the A/D Converter
The INA139 or INA169 devices can be used with an ADC such as the ADS7870 programmed for differential
mode operation. Figure 17 illustrates this configuration. In this configuration, the use of two devices allows for
bidirectional current measurement. Depending upon the polarity of the current, one of the devices provides an
output voltage while the other output is zero. In this way, the ADC reads the polarity of current directly, without
requiring additional circuitry.
RS
V+
4
3
4
3
5V
5V
5V
REFOUT BUFIN
5
5
REF
Digital
I/O
INA139
2
1
BUFOUT
BUF
INA139
2
RL
25 kΩ
1
MUX
RL
25 kΩ
12-Bit
A/D
Converter
PGIA
Clock
Divider
Oscillator
Serial
I/O
ADS7870
The A/D converter is programmed for differential input.
Depending on the polarity of the current, one INA139 provides
an output voltage whereas the output of the other is zero.
Copyright © 2017, Texas Instruments Incorporated
Figure 17. Bipolar Current Measurement Using a Differential Input of the A/D Converter
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
17
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
Typical Applications (continued)
8.2.6 Multiplexed Measurement Using Logic Signal for Power
Multiple loads can be measured as illustrated in Figure 18. In this configuration, each INA139 or INA169 device
is powered by the digital I/O from the ADS7870. Multiplex each device by switching the desired I/O on or off.
Other INA169s
Digital I/O on the ADS7870 provides power to
select the desired INA169. Diodes prevent
output current of an on INA169 from flowing
into an off INA169.
INA169
V+
5V
––
REFOUT BUFIN
REF
Digital
I/O
BUFOUT
BUF
INA169
V+
––
MUX
12-Bit
A/D
Converter
PGIA
1N4148
RL
Clock
Divider
Oscillator
Serial
I/O
ADS7870
Copyright © 2017, Texas Instruments Incorporated
Figure 18. Multiplexed Measurement Using Logic Signal for Power
9 Power Supply Recommendations
The input circuitry of the INA139 can accurately measure beyond the power-supply voltage (V+). For example,
the V+ power supply can be 5 V, whereas the load power supply voltage is up to 40 V (or 60 V with the INA169).
However, the output voltage range of the OUT terminal is limited by the lesser of the two voltages (see the
Output Voltage Range section). TI recommends placing a 0.1-µF capacitor near the V+ pin on the INA139 or
INA169. Additional capacitance may be required for applications with noisy supply voltages.
18
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
INA139, INA169
www.ti.com
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
10 Layout
10.1 Layout Guidelines
Figure 19 shows the basic connection of the INA139. The input pins (VIN+ and VIN–) must be connected as
closely as possible to the shunt resistor to minimize any resistance in series with the shunt resistance. The
output resistor, RL, is shown connected between pin 1 and ground. Best accuracy is achieved with the output
voltage measured directly across RL. This is especially important in high-current systems where load current
could flow in the ground connections, affecting the measurement accuracy.
No power-supply bypass capacitors are required for stability of the INA139. However, applications with noisy or
high-impedance power supplies may require decoupling capacitors to reject power-supply noise; connect the
bypass capacitors close to the device pins.
10.2 Layout Example
VIA to Ground Plane
Output
OUT
GND
RL
To Bus
Voltage
Supply Voltage
V+
INA139
INA169
VIN+
0.1 µF
VIN-
PCB Pad
PCB Pad
To Load
RSHUNT
Copyright © 2017, Texas Instruments Incorporated
Figure 19. Typical Layout Example
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
19
INA139, INA169
SBOS181F – DECEMBER 2000 – REVISED FEBRUARY 2017
www.ti.com
11 Device and Documentation Support
11.1 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 1. Related Links
PARTS
PRODUCT FOLDER
ORDER NOW
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
INA139
Click here
Click here
Click here
Click here
Click here
INA169
Click here
Click here
Click here
Click here
Click here
11.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
20
Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: INA139 INA169
PACKAGE OPTION ADDENDUM
www.ti.com
20-Aug-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
INA139NA/250
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
E39
INA139NA/3K
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
E39
INA169NA/250
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
A69
INA169NA/250G4
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
A69
INA169NA/3K
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
A69
INA169NA/3KG4
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
A69
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
工商网监
湘ICP备2023018690号
