INA170EA/250 [TI]
2.7V 至 60V、双向、400kHz 可变增益电流感应放大器 | DGK | 8 | -40 to 85;
| 型号： | INA170EA/250 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 2.7V 至 60V、双向、400kHz 可变增益电流感应放大器 | DGK | 8 | -40 to 85 放大器 PC 光电二极管 |
| 文件： | 总15页 (文件大小：889K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INA170
SBOS193D – MARCH 2001 – REVISED JANUARY 2006
High-Side, Bidirectional
CURRENT SHUNT MONITOR
FEATURES
● COMPLETE BIDIRECTIONAL CURRENT
MEASUREMENT CIRCUIT
● WIDE SUPPLY RANGE: 2.7V to 40V
● SUPPLY-INDEPENDENT COMMON-MODE
VOLTAGE: 2.7V TO 60V
● RESISTOR PROGRAMMABLE GAIN SET
● LOW QUIESCENT CURRENT: 75µA (typ)
● MSOP-8 PACKAGE
DESCRIPTION
The INA170 is a high-side, bidirectional current shunt moni-
tor featuring a wide input common-mode voltage range, low
quiescent current, and a tiny MSOP-8 package.
Bidirectional current measurement is accomplished by out-
put offsetting. The offset voltage level is set with an external
resistor and voltage reference. This permits measurement of
a bidirectional shunt current while using a single supply for
the INA170.
Input common-mode and power-supply voltages are inde-
pendent. Input voltage can range from +2.7V to +60V on any
supply voltage from +2.7V to +40V. Low 10µA input bias
current adds minimal error to the shunt current.
APPLICATIONS
● CURRENT SHUNT MEASUREMENT:
Automotive, Telephone, Computers, Power
Systems, Test, General Instrumentation
● PORTABLE AND BATTERY-BACKUP
SYSTEMS
The INA170 converts a differential input voltage to a current
output. This current develops a voltage across an external
load resistor, setting any gain from 1 to over 100.
The INA170 is available in an MSOP-8 package, and is
specified over the extended industrial temperature range,
–40°C to +85°C with operation from –55°C to +125°C.
● BATTERY CHARGERS
● POWER MANAGEMENT
● CELL PHONES
V+
8
VSUPPLY
RG1
1kΩ
VIN+
2
IS
RG2
1kΩ
RS
A1
VI–N
Q1
1
6
OUT
RL
VREF
3
Load
A2
Q2
INA170
ROS
5
4
GND
ROS
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2001-2006, Texas Instruments Incorporated
www.ti.com
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommendsthatallintegratedcircuitsbehandledwith
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
Supply Voltage, V+ to GND ................................................. –0.3V to 40V
Analog Inputs, Common Mode(2) ......................................... –0.3V to 75V
Differential (VI+N) – (VI–N) .................................. –40V to 2V
Analog Output, Out(2) ........................................................... –0.3V to 40V
Input Current Into Any Pin ............................................................... 10mA
Operating Temperature ..................................................–55°C to +125°C
Storage Temperature .....................................................–65°C to +150°C
Junction Temperature .................................................................... +150°C
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.
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those specified is not implied.
(2) The input voltage at any pin may exceed the voltage shown if the current
at that pin is limited to 10mA.
PACKAGE/ORDERING INFORMATION(1)
SPECIFIED
PACKAGE
DESIGNATOR
TEMPERATURE
RANGE
PACKAGE
MARKING
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
PRODUCT
INA170EA
"
PACKAGE-LEAD
MSOP-8
DGK
–40°C to +85°C
INA170EA
INA170EA/250
INA170EA/2K5
Tape and Reel, 250
Tape and Reel, 2500
"
"
"
"
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at
www.ti.com.
PIN CONFIGURATION
PIN DESCRIPTION
TOP VIEW
MSOP
PIN
DESIGNATOR
DESCRIPTION
1
2
3
4
5
6
7
8
VI–N
VI+N
Inverting Input
Noninverting Input
Reference Voltage Input
Ground
VI–N
VI+N
1
2
3
4
8
7
6
5
V+
VREF
GND
ROS
OUT
NC
NC
VREF
GND
OUT
ROS
Offset Resistor
Output
No Connection
Supply Voltage
V+
INA170
2
SBOS193D
www.ti.com
ELECTRICAL CHARACTERISTICS
At TA = –40°C to +85°C, VS = 5V, VI+N = 12V, ROUT = 25kΩ, unless otherwise noted.
INA170EA
TYP
PARAMETER
CONDITION
MIN
MAX
UNITS
INPUT
Full-Scale Sense (Input) Voltage
Common-Mode Input Range
Common-Mode Rejection
Offset Voltage(1) RTI
vs Temperature
V
SENSE = VI+N – VI–N
100
500
+60
mV
V
+2.7
100
VI+N = +2.7V to +60V, VSENSE = 50mV
120
±0.2
1
0.1
10
dB
±1
mV
µV/°C
µV/V
uA
T
MIN to TMAX
vs Power Supply
Input Bias Current
V+ = +2.7V to +60V, VSENSE = 50mV
VI+N, VI–N
10
OFFSETTING AMPLIFIER
Offsetting Equation
Input Voltage
Input Offset Voltage
vs Temperature
Programming Current through ROS
Input Impedance
Input Bias Current
V
OS = (RL/ROS) VREF
1
0
VS – 1
±1
V
mV
µV/°C
mA
Ω || pF
nA
±0.2
10
T
MIN to TMAX
1
1010 || 4
+10
VI+N, VI–N
OUTPUT
Transconductance
vs Temperature
Nonlinearity Error
Total Output Error
Output Impedance
Voltage Output
VSENSE = 10mV to 150mV
SENSE = 100mV
SENSE = 10mV to 150mV
0.990
1
50
±0.01
±0.5
1 || 5
1.01
mA/V
nA/°C
%
V
V
±0.1
±2
V
SENSE = 100mV
%
GΩ || pF
Swing to Power Supply, V+
Swing to Common Mode, VCM
(V+) – 0.9
VCM – 0.6
(V+) – 1.2
VCM – 1.0
V
V
FREQUENCY RESPONSE
Bandwidth
Settling Time (0.1%)
ROUT = 10kΩ
5V Step, ROUT = 10kΩ
400
3
kHz
µs
NOISE
Output-Current Noise Density
Total Output-Current Noise
20
7
pA/√Hz
nA RMS
BW = 100kHz
POWER SUPPLY
Operating Range
Quiescent Current
V+
+2.7
+40
125
V
µA
VSENSE = 0, IO = 0
75
TEMPERATURE RANGE
Specification, TMIN to TMAX
Operating
–40
–55
–65
+85
+125
+150
°C
°C
°C
Storage
Thermal Resistance, θJA
150
°C/W
NOTE: (1) Defined as the amount of input voltage, VSENSE, to drive the output to zero.
INA170
SBOS193D
3
www.ti.com
TYPICAL CHARACTERISTICS
At TA = +25°C, V+ = 5V, VI+N = 12V, RL = 25kΩ, unless otherwise noted.
COMMON-MODE REJECTION vs FREQUENCY
GAIN vs FREQUENCY
40
120
100
80
60
40
20
0
RL = 100kΩ
G = 100
30
RL = 10kΩ
20
G = 10
G = 1
10
RL = 1kΩ
0
–10
–20
100
1k
10k
100k
1M
10M
100k
40
0.1
1
10
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
TOTAL OUTPUT ERROR vs VIN
VIN = (VI+N – VI–N
POWER-SUPPLY REJECTION vs FREQUENCY
5
0
140
120
100
80
)
–55°C
G = 100
G = 10
+150°C
–5
+25°C
G = 1
60
–10
–15
40
20
25
50
75
VIN (mV)
100
125
150
0
200
1
10
100
1k
10k
Frequency (Hz)
TOTAL OUTPUT ERROR
vs POWER-SUPPLY VOLTAGE
QUIESCENT CURRENT
vs POWER-SUPPLY VOLTAGE
2
1
100
80
60
40
20
0
Output error is essentially
independent of both
V+ supply voltage and
input common-mode voltage.
+150°
+125°
+25°
G = 1
0
–55°
G = 10
G = 25
–1
–2
0
10
20
Power-Supply Voltage (V)
30
0
10
20
30
40
Power-Supply Voltage (V)
INA170
4
SBOS193D
www.ti.com
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, V+ = 5V, VI+N = 12V, RL = 25kΩ, unless otherwise noted.
STEP RESPONSE
STEP RESPONSE
1.5V
1V
G = 100
0.5V
G = 50
0V
1V
G = 100
0V
2V
G = 10
0V
20µs/div
10µs/div
INA170
SBOS193D
5
www.ti.com
bipolar with a more-positive voltage applied to pin 2. If a
more-negative voltage is applied to pin 1, output current IO
will decrease towards zero.
OPERATION
Figure 1 shows the basic circuit diagram for the INA170.
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.
BASIC CONNECTION
Figure 1 shows the basic connection of the INA170. The
input pins, VI+N and VI–N, 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 6 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.
Without offset, the transfer function for the INA170 is:
IO = gm (VI+N – VI–N)
(1)
(2)
where gm = 1000µA/V
In the circuit of Figure 1, the input voltage, (VI+N – VI–N), is
equal to IS • RS and the output voltage, VOUT, is equal to
IO • RL. The transconductance, gm, of the INA170 is
1000µA/V. The complete transfer function for the current
measurement amplifier in this application is:
No power-supply bypass capacitors are required for stability
of the INA170. However, applications with noisy or high
impedance power supplies may require de-coupling capaci-
tors to reject power-supply noise. Connect bypass capacitors
close to the device pins.
POWER SUPPLIES
VOUT = (IS) (RS) (1000µA/V) (RL)
(3)
The input circuitry of the INA170 can accurately measure
beyond its power-supply voltage, V+. For example, the V+
power supply can be 5V, while the load power-supply
voltage (INA170 input voltage) is up to +60V. However, the
output-voltage range of the OUT terminal (pin 6) is limited
by the supply.
Applying a positive reference voltage to pin 3 causes a
current to flow through ROS, forcing output current IO to be
offset from zero. The transfer function then becomes:
VREF • RL
ROS
IS • RS • RL
VOUT
=
±
(4)
1kΩ
SELECTING RS AND RL
The maximum differential input voltage for accurate mea-
surements is 0.5V, which produces a 500µA output current.
A differential input voltage of up to 2V will not cause
damage. Differential measurements (pins 1 and 2) can be
The value chosen for the shunt resistor, RS, depends on the
application and is a compromise between small-signal accu-
racy and maximum permissible voltage loss in the measure-
ment line. High values of RS provide better accuracy at lower
VP
Load Power Supply
+2.7 to 60V
Shunt
RS
IS
VIN+
VI–N
V+ power can be
common or
independent of
2
1
Load
V+
INA170
load supply.
RG1
1kΩ
RG2
1kΩ
2.7 ≤ (V+) ≤ 40V
8
3
VREF
VOLTAGE GAIN
EXACT RL (Ω)
NEAREST 1% RL (Ω)
Q2
Q1
1
2
1k
2k
1k
2k
OUT
6
5
5k
4.99k
10k
20k
49k
100k
+
VO
–
5
4
I0
10
20
50
100
10k
20k
50k
100k
RL
ROS
FIGURE 1. Basic Circuit Connections.
6
INA170
SBOS193D
www.ti.com
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 50mV to 100mV.
Maximum input voltage for accurate measurements is 500mV.
output swing. The maximum output voltage compliance is
limited by the lower of the two equations below:
Vout max = (V+) – 0.7V – (VI+N – VI–N)
(5)
(6)
or
RL is chosen to provide the desired full-scale output voltage.
The output impedance of the INA170 Out terminal is very
high which permits using values of RL up to 100kΩ 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.
Vout max = VI–N – 0.5V
(whichever is lower)
BANDWIDTH
Measurement bandwidth is affected by the value of the load
resistor, RL. High gain produced by high values of RL will
yield a narrower measurement bandwidth (see Typical Char-
acteristic Curves). For widest possible bandwidth, keep the
capacitive load on the output to a minimum.
Some Analog-to-Digital (A/D) converters have input imped-
ances that will significantly affect 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, as shown in Figure 2. See
Figure 1 for recommended values of RL.
If bandwidth limiting (filtering) is desired, a capacitor can be
added to the output, as shown in Figure 3. This will not
cause instability.
IS
2
1
1
2
f–3dB
1
f–3dB
=
INA170
2πRLCL
INA170
ZIN
6
OPA340
VO
6
4
CL
RL
4
RL
Buffer of amp drives A/D converter
without affecting gain.
FIGURE 2. Buffering Output to Drive A/D Converter.
FIGURE 3. Output Filter.
OUTPUT VOLTAGE RANGE
APPLICATIONS
The output of the INA170 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
The INA170 is designed for current shunt measurement
circuits as shown in Figure 1, 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.
IS
2
1
Gain Set by RL
VREF
Output Offset Current =
INA170
ROS
6
3
VREF
VREF
V0
Output Offset Voltage =
• RL
ROS
5
4
RL
ROS
FIGURE 4. Offsetting the Output Voltage.
INA170
SBOS193D
7
www.ti.com
I
S = ±10A
0.0125Ω
+5V
Load
28V
0.1µF
∆V =
±125mV
Full-Scale
8
1
2
V+
VI–N
I
O = 125µA ± 125µA
VIN+
6
INA170
IOS = 125µA
OUT
3
RL
10kΩ
VREF
VOUT = 0 to +2.5V Full-Scale
+2.5V
ROS
GND
4
5
20kΩ
FIGURE 5. Bipolar Current Measurement.
INA170
8
SBOS193D
www.ti.com
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
INA170EA/250
INA170EA/2K5
ACTIVE
ACTIVE
VSSOP
VSSOP
DGK
DGK
8
8
250
RoHS & Green
NIPDAUAG
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
-40 to 85
-40 to 85
A70
A70
Samples
Samples
2500 RoHS & Green
NIPDAUAG
(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 <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
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
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
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.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
17-Jul-2020
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
INA170EA/250
INA170EA/2K5
VSSOP
VSSOP
DGK
DGK
8
8
250
330.0
330.0
12.4
12.4
5.3
5.3
3.4
3.4
1.4
1.4
8.0
8.0
12.0
12.0
Q1
Q1
2500
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
17-Jul-2020
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
INA170EA/250
INA170EA/2K5
VSSOP
VSSOP
DGK
DGK
8
8
250
366.0
366.0
364.0
364.0
50.0
50.0
2500
Pack Materials-Page 2
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Copyright © 2022, Texas Instruments Incorporated
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60-V, High-Side, Bi-Directional, High-Speed, Current Output Current Shunt Monitor 8-VSSOP -40 to 85
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