TI1 INA168QDBVRQ1 High-side measurement current shunt monitor Datasheet

INA138-Q1, IN168-Q1
www.ti.com
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
HIGH-SIDE MEASUREMENT CURRENT SHUNT MONITOR
Check for Samples: INA138-Q1, IN168-Q1
FEATURES
1
•
•
•
•
•
•
•
•
•
Qualified For Automotive Applications
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Complete Unipolar High-Side Current
Measurement Circuit
Wide Supply And Common-Mode Range
– INA138: 2.7 V to 36 V
– INA168: 2.7 V to 60 V
Independent Supply and Input Common-Mode
Voltages
Single Resistor Gain Set
Low Quiescent Current (25 µA typ)
Wide Temperature Range: –40°C to +125°C
TSSOP−8 and SOT23−5 Packages
APPLICATIONS
•
•
•
•
•
Current Shunt Measurement
Portable And Battery-Backup Systems
Battery Chargers
Power Management
Precision Current Source
DESCRIPTION
The INA138 and INA168 are high-side, unipolar,
current shunt monitors. Wide input common-mode
voltage range, low quiescent current, and tiny TSSOP
and SOT23 packaging enable uses in a variety of
applications.
Input common-mode and power-supply voltages are
independent and can range from 2.7 V to 36 V for the
INA138 and 2.7 V to 60 V for the INA168. Quiescent
current is only 25 mA, 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.
Both the INA138 and INA168 are available in
TSSOP−8 and SOT23−5 and are specified for the
–40°C to +125°C temperature range.
W
W
NC − No internal connection
W
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2010, Texas Instruments Incorporated
INA138-Q1, IN168-Q1
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
www.ti.com
ORDERING INFORMATION (1)
PRODUCT
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESIGNATOR (2)
PACKAGE−LEAD
PACKAGE
MARKING
TRANSPORT
MEDIA, QUANTITY
INA138QPWRQ1
TSSOP−8
PW
−40°C to +125°C
INA138
Tape and Reel, 2000
INA168QPWRQ1
TSSOP−8
PW
−40°C to +125°C
INA168
Tape and Reel, 2000
INA168QDBVRQ1
SOT23-5
DBV
−40°C to +125°C
LUIQ
Tape and Reel, 3000
(1)
(2)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ABSOLUTE MAXIMUM RATINGS (1)
over operating free-air temperature range (unless otherwise noted)
VALUE
Supply voltage, V+
Analog inputs, VIN+, VIN− , Common mode
INA138-Q1
−0.3 V to 60 V
INA168-Q1
−0.3 V to 75 V
INA138-Q1
−0.3 V to 60 V
INA168-Q1
−0.3 V to 75 V
Analog inputs, (VIN+) − (VIN−), Differential
−40 V to 2 V
Analog output, out
−0.3 V to 40 V
Operating temperature
−55°C to 150°C
Storage temperature
−65°C to 150°C
Junction temperature
150°C
Thermal resistance, junction-to-ambient, RΘJA
PW
150°C/W
DBV
200°C/W
Lead temperature (soldering, 10 seconds)
(1)
260°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
TA
= −40°C to 125°C, VS = 5 V, VIN+ = 12 V, and ROUT = 125 kΩ unless otherwise noted
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
100
500
mV
Input
Full-scale sense voltage
VSENSE = VIN+ − VIN−
Common-mode input range
Common-mode rejection
INA138
2.7
36
INA168
2.7
60
VIN+ = 2.7 V to 36 V, VSENSE
= 50 mV
INA138
VIN+ = 2.7 V to 60 V, VSENSE
= 50 mV
INA168
2
100
120
±0.2
Offset voltage vs temperature
(1)
120
dB
Offset voltage (1)
Offset voltage vs power supply, V+
100
±2
1
V+ = 2.7 V to 36 V, VSENSE =
50 mV
INA138
V+ = 2.7 V to 60 V, VSENSE =
50 mV
INA168
V
mV
mV/°C
0.1
10
0.1
10
mV/V
Defined as the amount of input voltage, VSENSE, to drive the output to zero.
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Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
INA138-Q1, IN168-Q1
www.ti.com
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
ELECTRICAL CHARACTERISTICS (continued)
TA
= −40°C to 125°C, VS = 5 V, VIN+ = 12 V, and ROUT = 125 kΩ unless otherwise noted
PARAMETER
Input bias current
TEST CONDITIONS
MIN
TYP
VIN+ = VIN− = 12 V
MAX
UNIT
10
mA
Output
Transconductance
VSENSE = 10 mV − 150 mV
Transconductance vs temperature
VSENSE = 100 mV
Nonlinearity error
VSENSE = 10 mV to 150 mV
Total output error
VSENSE = 100 mV
194
206
10
Output impedance
mA/V
nA/°C
±0.01%
±0.2 %
±0.5
±3.2
%
1
GΩ
5
pF
Voltage output swing to power
supply, V+
(V+) − 0.8
(V+) − 1.2
V
Voltage output swing to common
mode, VCM
VCM − 0.5
VCM − 1.2
V
Frequency Response
Bandwidth
Settling time (0.1%)
ROUT = 5 kΩ
5 V step
800
ROUT = 125 kΩ
32
ROUT = 5 kΩ
1.8
ROUT = 125 kΩ
30
kHz
ms
Noise
Output-current noise density
TA = 25°C
9
pA/√Hz
Total output-current noise
BW = 100 kHz
3
nA RMS
Power Supply
Operating range, V+
Quiescent current
INA138
2.7
36
INA168
2.7
60
VSENSE = 0, IO = 0
Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
25
60
Submit Documentation Feedback
V
mA
3
INA138-Q1, IN168-Q1
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
www.ti.com
TYPICAL CHARACTERISTICS
TA = +25°C, V+ = 5 V, VIN+ = 12 V, and RL = 125 kΩ, unless otherwise noted.
W
Gain (dB)
W
W
–
Common-Mode Rejection (dB)
COMMON-MODE REJECTION vs FREQUENCY
–
Figure 1.
Figure 2.
POWER-SUPPLY REJECTION vs FREQUENCY
Total Output Error (%)
Power-Supply Rejection (dB)
–
–
–
–
–
Figure 3.
Figure 4.
Quiescent Current (A)
Total Output Error (%)
TOTAL OUTPUT ERROR
vs POWER-SUPPLY VOLTAGE
–
–
Power-Supply Voltage (V)
Power-Supply Voltage (V)
Figure 5.
4
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Figure 6.
Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
INA138-Q1, IN168-Q1
www.ti.com
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
TYPICAL CHARACTERISTICS (continued)
TA = +25°C, V+ = 5 V, VIN+ = 12 V, and RL = 125 kΩ, unless otherwise noted.
m
m
Figure 7.
Figure 8.
Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
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INA138-Q1, IN168-Q1
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
www.ti.com
APPLICATION INFORMATION
Figure 9 illustrates the basic circuit diagram for both the INA138 and INA168. 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 op
amp, causing current to flow into the collector of Q1. External resistor RL converts the output current to a voltage,
VOUT, at the OUT pin. The transfer function for the INA138 is:
IO = gm (VIN+ − VIN−)
where gm = 200 mA/V.
In the circuit of Figure 9, the input voltage, (VIN+ − VIN−), is equal to IS x RS and the output voltage, VOUT, is
equal to IO x RL. The transconductance, gm, of the INA138 is 200 mA/V. The complete transfer function for the
current measurement amplifier in this application is:
VOUT = (IS) (RS) (200 mA/V) (RL)
The maximum differential input voltage for accurate measurements is 0.5 V, which produces a 10 mA 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, will be zero, but it will not cause damage.
BASIC CONNECTION
Figure 9 shows the basic connection of the INA138. The input pins, VIN+ and VIN−, should 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 INA138. However, applications with noisy or
high-impedance power supplies may require decoupling capacitors to reject power-supply noise. Connect bypass
capacitors close to the device pins.
POWER SUPPLIES
The input circuitry of the INA138 can accurately measure beyond its power-supply voltage, V+. For example, the
V+ power supply can be 5 V, whereas the load power supply voltage is up to +36 V (or +60 V with the INA168).
The output voltage range of the OUT terminal, however, is limited by the lesser of the two voltages (see Output
Voltage Range section).
SELECTING RS AND RL
The value chosen 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, the best performance is attained with an RS value that provides a
full-scale shunt voltage range of 50 mV to 100 mV. Maximum input voltage for accurate measurements is 500
mV.
RL is chosen to provide the desired full-scale output voltage. The output impedance of the INA138 OUT terminal
is very high which permits using values of RL up to 500 kΩ with excellent accuracy. The input impedance of any
additional circuitry at the output should be much higher than the value of RL to avoid degrading accuracy.
Some analog-to-digital (A/D) converters have input impedances that significantly affects measurement gain. The
input impedance of the A/D converter can be included as part of the effective RL if its input can be modeled as a
resistor to ground. Alternatively, an op amp can be used to buffer the A/D converter input. Figure 9 shows the
recommended values of RL.
6
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Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
INA138-Q1, IN168-Q1
www.ti.com
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
(A)
–
≤
≤
(A)
W
W
–
Figure 9. Basic Circuit Connections
OUTPUT VOLTAGE RANGE
The output of the INA138 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 the two equations below:
Vout max = (V+) − 0.7 V − (VIN+ − VIN−)
or
Vout max = VIN− − 0.5 V
(whichever is lower)
BANDWIDTH
Measurement bandwidth is affected by the value of the load resistor, RL. High gain produced by high values of
RL yields a narrower measurement bandwidth (see the Typical Characteristics section). 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 section.
If bandwidth limiting (filtering) is desired, a capacitor can be added to the output (see Figure 12). This will not
cause instability.
APPLICATIONS
The INA138 is designed for current shunt measurement circuits, as shown in Figure 9, but its basic function is
useful in a wide range of circuitry. An engineer may find many unforeseen uses in measurement and level
shifting circuits. A few ideas are illustrated in Figure 10 through Figure 15.
Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
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INA138-Q1, IN168-Q1
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
www.ti.com
–
–
Figure 10. Buffering Output to Drive and A/D
Converter
p
Figure 11. Output Filter
m
||
m
Figure 12. Offsetting the Output Voltage
8
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Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
INA138-Q1, IN168-Q1
www.ti.com
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
|
W
W
W
W
W
Figure 13. Bipolar Current Measurement
Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
Submit Documentation Feedback
9
INA138-Q1, IN168-Q1
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
www.ti.com
12-Bit
W
W
Figure 14. Bipolar Current Measurement Using Differential Input of A/D Converter
10
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Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
INA138-Q1, IN168-Q1
www.ti.com
SGLS174D – SEPTEMBER 2003 – REVISED DECEMBER 2010
12-Bit
Figure 15. Multiplexed Measurement Using Logic Signal for Power
Copyright © 2003–2010, Texas Instruments Incorporated
Product Folder Link(s): INA138-Q1 IN168-Q1
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PACKAGE OPTION ADDENDUM
www.ti.com
12-Oct-2011
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package
Drawing
Pins
Package Qty
Eco Plan
(2)
Lead/
Ball Finish
MSL Peak Temp
(3)
INA138QPWRQ1
ACTIVE
TSSOP
PW
8
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
INA168QDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
INA168QPWRG4Q1
ACTIVE
TSSOP
PW
8
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM
INA168QPWRQ1
ACTIVE
TSSOP
PW
8
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-1-260C-UNLIM
Samples
(Requires Login)
(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)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
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TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF INA138-Q1, INA168-Q1 :
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
12-Oct-2011
• Catalog: INA138, INA168
NOTE: Qualified Version Definitions:
• Catalog - TI's standard catalog product
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
1-Dec-2011
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
INA168QDBVRQ1
Package Package Pins
Type Drawing
SPQ
SOT-23
3000
DBV
5
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
180.0
8.4
Pack Materials-Page 1
3.2
B0
(mm)
K0
(mm)
P1
(mm)
3.1
1.39
4.0
W
Pin1
(mm) Quadrant
8.0
Q3
PACKAGE MATERIALS INFORMATION
www.ti.com
1-Dec-2011
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
INA168QDBVRQ1
SOT-23
DBV
5
3000
210.0
185.0
35.0
Pack Materials-Page 2
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