Burr Brown Products
from Texas Instruments
IN
A2
71
IN
A2
70
INA270
INA271
SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007
Voltage Output, Unidirectional Measurement
Current-Shunt Monitor
FEATURES
•
•
•
WIDE COMMON-MODE RANGE: –16V to +80V
CMRR: 120dB
ACCURACY:
±2.5mV
offset (max)
±1%
gain error (max)
20µV/°C offset drift (max)
55ppm/°C gain drift (max)
BANDWIDTH: Up to 130kHz
TWO TRANSFER FUNCTIONS AVAILABLE:
14V/V (INA270)
20V/V (INA271)
QUIESCENT CURRENT: 900µA (max)
POWER SUPPLY: +2.7V to +18V
PROVISION FOR FILTERING
DESCRIPTION
The INA270 and INA271 family of current-shunt
monitors with voltage output can sense drops across
current shunts at common-mode voltages from –16V
to +80V, independent of the supply voltage. The
INA270 and INA271 pinouts readily enable filtering.
The INA270 and INA271 are available with two
output voltage scales: 14V/V and 20V/V. The 130kHz
bandwidth simplifies use in current-control loops.
The INA270 and INA271 operate from a single +2.7V
to +18V supply, drawing a maximum of 900µA of
supply current. They are specified over the extended
operating temperature range of –40°C to +125°C and
are offered in an SO-8 package.
R
S
-16V
to +80V
Supply
Load
Single-Pole Filter
Capacitor
+2.7V to +18V
IN+
5kW
IN-
5kW
PRE OUT
BUF IN
V+
•
•
•
•
•
•
•
•
•
•
•
•
APPLICATIONS
POWER MANAGEMENT
AUTOMOTIVE
TELECOM EQUIPMENT
NOTEBOOK COMPUTERS
BATTERY CHARGERS
CELL PHONES
WELDING EQUIPMENT
A1
OUT
A2
96kW
R
L
INA270
GND
DEVICE COMPARISON
DEVICE
INA270
INA271
GAIN
14V/V
20V/V
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
INA270
INA271
www.ti.com
SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007
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.
ORDERING INFORMATION
(1)
PRODUCT
INA270
INA271
(1)
PACKAGE-LEAD
SO-8
SO-8
PACKAGE
DESIGNATOR
D
D
GAIN
14
20
PACKAGE
MARKING
I270A
I271A
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.
ABSOLUTE MAXIMUM RATINGS
(1)
INA270, INA271
Supply Voltage (V
S
)
Analog Inputs, V
IN+
, V
IN–
:
Differential, (V
IN+
) – (V
IN–
)
Common-Mode
Analog Output:
OUT and PRE OUT Pins
Input Current Into Any Pin
Operating Temperature
Storage Temperature
Junction Temperature
ESD Ratings:
Human Body Model
Charged-Device Model
(1)
3000
750
V
V
GND – 0.3 to (V+) + 0.3
5
–55 to +150
–65 to +150
+150
V
mA
°C
°C
°C
–18 to +18
–16 to +80
V
V
+18
UNIT
V
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 supported.
PIN CONFIGURATION
SO-8
Top View
IN-
GND
PRE OUT
BUF IN
1
2
INA27x
3
4
6
5
V+
OUT
8
7
IN+
NC
(1)
NOTE (1): NC denotes no internal connection.
2
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INA270
INA271
www.ti.com
SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007
ELECTRICAL CHARACTERISTICS
Boldface
limits apply over the specified temperature range:
T
A
= –40°C to +125°C.
At T
A
= +25°C, V
S
= +5V, V
CM
= +12V, V
SENSE
= 100mV, and PRE OUT connected to BUF IN, unless otherwise noted.
INA270, INA271
PARAMETER
INPUT
Full-Scale Input Voltage
Common-Mode Input Range
Common-Mode Rejection Ratio
Over Temperature
Offset Voltage, RTI
(1)
Over Temperature
vs Temperature
vs Power-Supply
Input Bias Current, V
IN–
Pin
PRE OUT Output Impedance
(2)
Buffer Input Bias Current
Buffer Input Bias Current Temperature
Coefficient
OUTPUT (V
SENSE
≥
20mV)
(3)
Gain: INA270 Total Gain
Gain: INA271 Total Gain
Output Buffer Gain
Total Gain Error
Over Temperature
vs Temperature
Total Output Error
(4)
Total Output Error
Nonlinearity Error
Output Impedance, Pin 5
Maximum Capacitive Load
VOLTAGE
OUTPUT
(5)
R
O
No Sustained Oscillation
R
L
= 10kΩ to GND
(V+) – 0.05
V
GND
+ 0.003
BW
C
LOAD
= 5pF
C
LOAD
< 10nF
SR
t
S
V
SENSE
= 10mV to 100mV
PP
,
C
LOAD
= 5pF
130
40
1
2
(V+) – 0.2
V
GND
+ 0.05
V
V
V
SENSE
= 20mV to 100mV
V
SENSE
= 20mV to 100mV
±0.75
±1.0
±0.002
1.5
10
G
G
G
BUF
V
SENSE
= 20mV to 100mV
14
20
2
±0.2
±1
±2
50
±2.2
±3.0
V/V
V/V
V/V
%
%
ppm/°C
%
%
%
Ω
nF
dV
OS
/dT
PSR
I
B
V
S
= +2.7V to +18V, V
CM
= +18V
2.5
5
±8
96
–50
±0.03
V
OS
V
SENSE
V
CM
CMRR
V
IN+
= –16V to +80V
V
IN+
= +12V to +80V
V
SENSE
= (V
IN+
) + (V
IN–
)
–16
80
100
120
120
±0.5
2.5
±3
20
100
±16
0.15
(V
S
– 0.2)/Gain
+80
V
V
dB
dB
mV
mV
µV/°C
µV/V
µA
kΩ
nA
nA/°C
CONDITIONS
MIN
TYP
MAX
UNIT
Swing to V+ Power-Supply Rail
Swing to GND
(6)
FREQUENCY RESPONSE
Bandwidth
Phase Margin
Slew Rate
Settling Time (1%)
kHz
degrees
V/µs
µs
(1)
(2)
(3)
(4)
(5)
(6)
RTI means
Referred-to-Input.
Initial resistor variation is
±30%
with an additional –2200ppm/°C temperature coefficient.
For output behavior when V
SENSE
< 20mV, see the Application Information section
Accuracy Variations
as A Result of V
SENSE
and
Common-Mode Voltage.
Total output error includes effects of gain error and V
OS
.
See typical characteristic curve
Output Swing vs Output Current
and Application Information section
Accuracy Variations
as A Result of
V
SENSE
and Common-Mode Voltage.
Ensured by design; not production tested.
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3
INA270
INA271
www.ti.com
SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007
ELECTRICAL CHARACTERISTICS (continued)
Boldface
limits apply over the specified temperature range:
T
A
= –40°C to +125°C.
At T
A
= +25°C, V
S
= +5V, V
CM
= +12V, V
SENSE
= 100mV, and PRE OUT connected to BUF IN, unless otherwise noted.
INA270, INA271
PARAMETER
NOISE, RTI
(7)
Voltage Noise Density
POWER SUPPLY
Operating Range
Quiescent Current
Over Temperature
TEMPERATURE RANGE
Specified Temperature Range
Operating Temperature Range
Thermal Resistance
SO-8
θ
JA
+150
°C/W
–40
–55
+125
+150
°C
°C
V
S
I
Q
V
OUT
= 2V
V
SENSE
= 0mV
+2.7
700
350
+18
900
950
V
µA
µA
e
n
40
nV/√Hz
CONDITIONS
MIN
TYP
MAX
UNIT
(7)
RTI means
Referred-to-Input.
4
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INA270
INA271
www.ti.com
SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007
TYPICAL CHARACTERISTICS
At T
A
= +25°C, V
S
= +12V, V
CM
= 12V, and V
SENSE
= 100mV, unless otherwise noted.
GAIN vs FREQUENCY
45
40
35
C
LOAD
= 1000pF
45
40
35
G = 20
G = 14
GAIN vs FREQUENCY
C
LOAD
= 0pF
Gain (dB)
Gain (dB)
30
25
20
15
10
5
10k
30
25
20
15
10
5
G = 20
G = 14
100k
Frequency (Hz)
1M
10k
100k
Frequency (Hz)
1M
Figure 1.
Figure 2.
COMMON-MODE AND POWER-SUPPLY REJECTION
vs FREQUENCY
140
130
GAIN PLOT
20
18
16
14
20V/V
V
S
= 18V
Common-Mode and
Power-Supply Rejection (dB)
120
110
100
90
80
70
60
50
40
CMRR
V
OUT
(V)
12
10
8
6
4
2
0
14V/V
PSR
0
100
800
200
300
400
500
600
700
900
1000
1100
1200
1300
10
100
1k
Frequency (Hz)
10k
100k
V
SENSE
(mV)
Figure 3.
TOTAL OUTPUT ERROR vs V
SENSE
4.0
0.10
0.09
0.08
Figure 4.
OUTPUT ERROR vs COMMON-MODE VOLTAGE
Total Output Error
(% error of the ideal output value)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
50
100 150
200
250 300
350 400 450 500
V
SENSE
(mV)
Output Error (%)
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
-16 -12 -8 -4
0
4
8
12 16 20
...
76 80
Common-Mode Voltage (V)
Figure 5.
Figure 6.
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