TI INA139NA/3KQ1 High side measurement current shunt monitor Datasheet

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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
FEATURES
DESCRIPTION
D Qualification in Accordance With AEC-Q100(1)
The INA139 and INA169 are high-side, unipolar, current
shunt monitors. Wide input common-mode voltage range,
high-speed, low quiescent current, and tiny TSSOP−8 and
SOT23 packaging enable use in a variety of applications.
D Qualified for Automotive Applications
D Customer-Specific Configuration Control Can
Be Supported Along With Major-Change
Approval
D ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
D Complete Unipolar High−Side Current
Measurement Circuit
D Wide Supply And Common−Mode Range
− INA139: 2.7 V to 40 V
− INA169: 2.7 V to 60 V
D Independent Supply and Input
Common-Mode Voltages
D Single Resistor Gain Set
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.
Both the INA139 and INA169 are available in TSSOP−8
and SOT23−5 and are specified for the −40°C to +125°C
temperature range.
PW PACKAGE
(TOP VIEW)
D Low Quiescent Current (60 mA Typ)
D Wide Temperature Range: −405C to +1255C
D TSSOP−8 and SOT23−5 Packages
APPLICATIONS
VIN−
VIN+
NC
GND
1
2
3
4
8
7
6
5
V+
NC
OUT
NC
NC − No internal connection
D Current Shunt Measurement:
− Automotive, Telephone, Computers
D Portable And Battery-Backup Systems
D Battery Chargers
D Power Management
D Cell Phones
D Precision Current Source
DBV PACKAGE
(TOP VIEW)
VIN+
GND
3
OUT
2
4
VIN−
1
5
V+
(1) Contact Texas Instruments for details. Q100 qualification data available on request.
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.
!"# $"%&! '#( '"!
! $#!! $# )# # #* "# '' +,(
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Copyright  2003 − 2004, Texas Instruments Incorporated
www.ti.com
SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
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.
IS
RS
VIN+
Up to 60V
2
1
VIN+
VIN−
1kΩ
Load
1kΩ
V+
8
OUT
GND
4
VO = ISR SRL/1kΩ
6
RL
ORDERING INFORMATION
PACKAGE
DESIGNATOR(1)
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
TRANSPORT MEDIA,
QUANTITY
TSSOP−8
PW
−40°C to +125°C
INA139
Tape and Reel, 2000
SOT23−5
DBV
−40°C to +125°C
39Q
Tape and Reel, 3000
TSSOP−8
PW
−40°C to +125°C
INA169
Tape and Reel, 2000
69Q
Tape and Reel, 3000
PRODUCT
PACKAGE−LEAD
INA139QPWRQ1
INA139NA/3KQ1
INA169QPWRQ1
INA169NA/3KQ1
SOT23−5
DBV
−40°C to +125°C
(1) For the most current specification and package information, see our web site at www.ti.com.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
Supply voltage, V+
Analog inputs, VIN+, VIN− , Common mode
INA139-Q1
−0.3 V to 60 V
INA169-Q1
−0.3 V to 75 V
INA139-Q1
−0.3 V to 60 V
INA169-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 125°C
Storage temperature
−65°C to 150°C
Junction temperature
Thermal resistance, junction-to-ambient, RΘJA
JA
Lead temperature (soldering, 10 seconds)
150°C
PW package
150°C/W
DBV package
200°C/W
260°C
(1) 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.
2
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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
ELECTRICAL CHARACTERISTICS
TA = −40°C to 125°C, VS = 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
VSENSE = VIN+ − VIN−
Common-mode input range (VIN+)
Common-mode rejection
VIN+ = 2.7 V to 40 V,
VSENSE = 50 mV
VIN+ = 2.7 V to 60 V,
VSENSE = 50 mV
INA139
2.7
40
INA169
2.7
60
INA139
100
115
INA169
100
120
dB
Offset voltage(1) RTI
"0.2
Offset voltage vs temperature
Offset voltage vs power supply, V+
"2
mV
µV/°C
1
V+ = 2.7 V to 40 V,
VSENSE = 50 mV
V+ = 2.7 V to 60 V,
VSENSE = 50 mV
V
INA139
0.5
10
INA169
0.1
10
µV/V
Input bias current
µA
10
OUTPUT
Transconductance
Transconductance vs temperature
VSENSE =10 mV − 150 mV
VSENSE =100 mV
Nonlinearity error
VSENSE =10 mV to 150 mV
Total output error
VSENSE =100 mV
980
Voltage output swing to power supply, V+
Voltage output swing to common mode,
VCM
FREQUENCY RESPONSE
Settling time (0.1%)
5 V step
1020
10
Output impedance
Bandwidth
1000
µA/V
nA/°C
"0.01
%
"0.2%
"0.5%
"2%
1
GΩ
5
pF
(V+)
− 0.9
(V+) −
1.2
V
VCM
− 0.6
VCM −
1
V
ROUT = 10 kΩ
ROUT = 20 kΩ
440
ROUT = 10 kΩ
ROUT = 20 kΩ
2.5
kHz
220
µs
5
NOISE
Output-current noise density
Total output-current noise
BW = 100 kHz
20
pA/√Hz
7
nA
RMS
POWER SUPPLY
Operating range, V+
INA139
2.7
40
INA169
2.7
60
Quiescent current
VSENSE = 0, IO = 0
(1) Defined as the amount of input voltage, VSENSE, to drive the output to zero.
60
125
V
µA
3
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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
TYPICAL CHARACTERISTICS
Typical characteristics are at TA = +25°C, V+ = 5 V, VIN+ = 12 V, and RL = 125 kΩ, unless otherwise noted.
COMMON−MODE REJECTION vs FREQUENCY
GAIN vs FREQUENCY
40
120
Common−Mode Rejection (dB)
R L = 100kΩ
30
RL = 10kΩ
Gain (dB)
20
10
RL = 1kΩ
0
−10
−20
100
G = 100
100
80
G = 10
60
G=1
40
20
0
1k
10k
100k
1M
10M
0.1
10
1
Frequency (Hz)
100
10k
1k
100k
Frequency (Hz)
TOTAL OUTPUT ERROR vs VIN
POWER−SUPPLY REJECTION vs FREQUENCY
5
140
+ − V− )
VIN = (VIN
IN
− 55° C
G = 100
PSR (dB)
100
G = 10
80
G=1
60
Total Output Error (%)
120
0
+150° C
−5
+25° C
−10
40
−15
20
1
100
10
1k
10k
0
100k
75
125
100
Frequency (Hz)
TOTAL OUTPUT ERROR
vs POWER−SUPPLY VOLTAGE
QUIESCENT CURRENT
vs POWER−SUPPLY VOLTAGE
150
200
100
Output error is essentially
independent of both
V+ supply voltage and
input common−mode voltage.
1
Quiescent Current (∝A)
Total Output Error (%)
50
VIN (mV)
2
G=1
0
G = 10
G = 25
−1
−2
+150°
80
+125°
+25°
60
− 55°
40
20
Use the INA169 with
(V+) > 40V
0
0
10
20
30
40
50
Power−Supply Voltage (V)
4
25
60
70
0
10
20
30
40
50
Power−Supply Voltage (V)
60
70
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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
TYPICAL CHARACTERISTICS (CONTINUED)
Typical characteristics are at TA = +25°C, V+ = 5 V, VIN+ = 12 V, and RL = 125 kΩ, unless otherwise noted.
STEP RESPONSE
STEP RESPONSE
1.5V
1V
G = 100
G = 50
0.5V
0V
1V
2V
G = 100
G = 10
0V
0V
20µs/div
10µs/div
APPLICATION INFORMATION
Figure 1 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 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 INA139 is:
IO = gm (VIN+ − VIN−)
where gm = 1000 µA/V.
In the circuit of Figure 1, 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 INA139 is 1000 µA/V. The complete transfer function for the current measurement amplifier in this
application is:
VOUT = (IS) (RS) (1000 µA/V) (RL)
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, will be zero, but it will not cause damage.
5
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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
1
2
8
VOLTAGE GAIN
EXACT RL (Ω)
1
2
5
10
20
50
100
1k
2k
5k
10k
20k
50k
100k
NEAREST 1% RL (Ω)
1k
2k
4.99k
10k
20k
49k
100k
4
6
Figure 1. Basic Circuit Connections
BASIC CONNECTION
Figure 1 shows the basic connection of the INA139. 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 INA139. 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 INA139 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 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).
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, 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 INA139 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 should
be much higher than the value of RL to avoid degrading accuracy.
Some Analog-to-Digital (A/D) converters have input impedances 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.
6
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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
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 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.
If bandwidth limiting (filtering) is desired, a capacitor can be added to the output (as shown in Figure 3) which will not cause
instability.
IS
2
1
2
1
f − 3dB
INA139
ZIN
OPA340
1
f − 3dB =
2πRLC L
INA139
VO
RL
Figure 2. Buffering Output to Drive the A/D
Converter
CL
RL
Buffer of amp drives the A/D converter
without affecting gain.
Figure 3. Output Filter
APPLICATIONS
The INA139 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 few ideas are illustrated in Figure 4 through Figure 7.
2
1
2
VR
INA139
VO
Gain Set by R1  R2
(VR )R 2
R1 + R 2
REF200
100µA
VO
1
R2
Output Offset =
V+
INA139
R1
1
1
RL
Gain Set by RL
Output Offset = (100µA)(RL)
(independent of V+)
a) Using resistor divider.
b) Using current source.
Figure 4. Offsetting the Output Voltage
7
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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
±1A
Charger
1Ω
1
2
1
2
+
48V
+5V
1kΩ
1kΩ
1kΩ
+5V
1kΩ
8
Load
8
INA169
4
6
INA169
4
6
1N4148
Comparator
1N4148
SIGN
10k Ω
10k Ω
0V to 1V
VO
100k Ω
Figure 5. Bipolar Current Measurement
8
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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
RS
V+
1
2
1
2
+5V
+5V
+5V
REFOUT BUFIN
8
8
Digital
I/O
INA139
4
6
RL
25kΩ
REF
BUFOUT
BUF
INA139
4
6
MUX
RL
25kΩ
Clock
Divider
Oscillator
12−Bit
A/D
Converter
PGIA
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 other’s out put is zero.
Figure 6. Bipolar Current Measurement Using Differential Input of A/D Converter
9
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SGLS185B − SEPTEMBER 2003 − REVISED OCTOBER 2004
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
Digital
I/O
REF
BUFOUT
BUF
INA169
V+
−
MUX
12−Bit
A/D
Converter
PGIA
1N4148
RL
Clock
Divider
Oscillator
Serial
I/O
ADS7870
Figure 7. Multiplexed Measurement Using Logic Signal for Power
10
MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
PW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,30
0,19
0,65
14
0,10 M
8
0,15 NOM
4,50
4,30
6,60
6,20
Gage Plane
0,25
1
7
0°– 8°
A
0,75
0,50
Seating Plane
0,15
0,05
1,20 MAX
PINS **
0,10
8
14
16
20
24
28
A MAX
3,10
5,10
5,10
6,60
7,90
9,80
A MIN
2,90
4,90
4,90
6,40
7,70
9,60
DIM
4040064/F 01/97
NOTES: A.
B.
C.
D.
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion not to exceed 0,15.
Falls within JEDEC MO-153
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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