TI1 LMP8640HVMKE-H Precision high voltage current sense amplifier Datasheet

LMP8640
LMP8640HV
www.ti.com
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
Precision High Voltage Current Sense Amplifier
Check for Samples: LMP8640, LMP8640HV
FEATURES
DESCRIPTION
•
•
The LMP8640 and the LMP8640HV are precision
current sense amplifiers that detect small differential
voltages across a sense resistor in the presence of
high input common mode voltages with a supply
voltage range from 2.7V to 12V.
1
2
•
•
•
•
•
•
•
•
•
Typical Values, TA = 25°C
High Common-Mode Voltage Range
– LMP8640: -2V to 42V
– LMP8640HV: -2V to 76V
Supply Voltage Range: 2.7V to 12V
Gain Options: 20V/V; 50V/V; 100V/V
Max Gain Error: 0.25%
Low Offset Voltage: 900µV
Input Bias Current: 13 µA
PSRR: 85 dB
CMRR (2.1V to 42V): 103 dB
Temperature Range: -40°C to 125°C
6-Pin SOT Package
The LMP8640 accepts input signals with common
mode voltage range from -2V to 42V, while the
LMP8640HV accepts input signal with common mode
voltage range from -2V to 76V. The LMP8640 and
LMP8640HV have fixed gain for applications that
demand accuracy over temperature. The LMP8640
and LMP8640HV come out with three different fixed
gains 20V/V, 50V/V, 100V/V ensuring a gain
accuracy as low as 0.25%. The output is buffered in
order to provide low output impedance. This high side
current sense amplifier is ideal for sensing and
monitoring currents in DC or battery powered
systems, excellent AC and DC specifications over
temperature, and keeps errors in the current sense
loop to a minimum. The LMP8640 and LMP8640HV
are ideal choice for industrial, automotive and
consumer applications, and it is available in SOT-6
package.
APPLICATIONS
•
•
•
•
•
•
High-Side Current Sense
Vehicle Current Measurement
Motor Controls
Battery Monitoring
Remote Sensing
Power Management
Typical Application
IS
+
RS
+IN
-IN
RIN
+
L
o
a
d
LMP8640
RIN
+
V
+
VA
G
ADC
VOUT
RG = 2*RIN
V
-
G = 10 V/V in 20 V/V gain option
G = 25 V/V in 50 V/V gain option
G = 50 V/V in 100 V/V gain option
1
2
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 © 2010–2013, Texas Instruments Incorporated
LMP8640
LMP8640HV
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
www.ti.com
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.
Absolute Maximum Ratings
ESD Tolerance
(4)
(1) (2) (3)
Human Body Model
For input pins +IN, -IN
5000V
For all other pins
2000V
Machine Model
200V
Charge device model
1250V
Supply Voltage (VS = V+ - V−)
13.2V
Differential Voltage +IN- (-IN)
6V
Voltage at pins +IN, -IN
LMP8640HV
-6V to 80V
LMP8640
-6V to 60V
V-to V+
Voltage at VOUT pin
Storage Temperature Range
Junction Temperature
(1)
(2)
(3)
(4)
(5)
2
-65°C to 150°C
(5)
150°C
“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the Operating Ratings is not implied. Operating Ratings indicate conditions at which the
device is functional and the device should not be operated beyond such conditions.
For soldering specifications,see product folder at www.ti.com and http://www.ti.com/lit/SNOA549.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of
JEDEC) Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).
The maximum power dissipation must be derated at elevated temperatures and is dictated by TJ(MAX), θJA, and the ambient temperature,
TA. The maximum allowable power dissipation PDMAX = (TJ(MAX) - TA)/ θJA or the number given in Absolute Maximum Ratings, whichever
is lower.
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Product Folder Links: LMP8640 LMP8640HV
LMP8640
LMP8640HV
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SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
Operating Ratings
(1)
Supply Voltage (VS = V+ - V−)
Temperature Range
2.7V to 12V
(2)
-40°C to 125°C
Package Thermal Resistance (2)
SOT-6
(1)
(2)
96°C/W
“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or
other conditions beyond those indicated in the Operating Ratings is not implied. Operating Ratings indicate conditions at which the
device is functional and the device should not be operated beyond such conditions.
The maximum power dissipation must be derated at elevated temperatures and is dictated by TJ(MAX), θJA, and the ambient temperature,
TA. The maximum allowable power dissipation PDMAX = (TJ(MAX) - TA)/ θJA or the number given in Absolute Maximum Ratings, whichever
is lower.
2.7V Electrical Characteristics
(1)
Unless otherwise specified, all limits ensured for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 2.7V, V− = 0V, −2V < VCM <
76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Parameter
Test Conditions
VOS
Input Offset Voltage
TCVOS
Input Offset Voltage Drift (4)
IB
Input Bias Current
eni
PSRR
CMRR
BW
(1)
(2)
(3)
(4)
(5)
(6)
(5)
Typ (3)
-900
-1160
VCM = 2.1V
(6)
Max (2)
Unit
900
1160
µV
2.6
µV/°C
20
27
µA
VCM = 2.1V
12
f > 10 kHz
117
nV/√Hz
Fixed Gain LMP8640-T
LMP8640HV-T
20
V/V
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
Fixed Gain LMP8640-H
LMP8640HV-H
100
V/V
Input Voltage Noise
Gain AV
VCM = 2.1V
Min (2)
(5)
-0.25
-0.51
Gain error
VCM = 2.1V
Accuracy over temperature (5)
−40°C to 125°C, VCM=2.1V
Power Supply Rejection Ratio
VCM = 2.1V, 2.7V < V+ < 12V,
85
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
103
LMP8640HV 2.1V < VCM < 76V
95
-2V <VCM < 2V,
60
Common Mode Rejection Ratio
0.25
0.51
%
26.2
ppm/°C
dB
dB
Fixed Gain LMP8640-T
LMP8640HV-T (5)
DC VSENSE = 67.5 mV,
CL = 30 pF,RL= 1MΩ
950
Fixed Gain LMP8640-F
LMP8640HV-F (5)
DC VSENSE =27 mV,
CL = 30 pF, RL= 1MΩ
450
Fixed Gain LMP8640-H
LMP8640HV-H (5)
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
230
kHz
Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very
limited self-heating of the device such that TJ = TA. No specification of parametric performance is indicated in the electrical tables under
conditions of internal self-heating where TJ > TA. Absolute Maximum Ratings indicate junction temperature limits beyond which the
device may be permanently degraded, either mechanically or electrically.
Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using
statistical quality control (SQC) method.
Typical values represent the most likely parametric norm at the time of characterization. Actual typical values may vary over time and
will also depend on the application and configuration. The typical values are not tested and are not ensured on shipped production
material.
Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature
change.
This parameter is ensured by design and/or characterization and is not tested in production.
Positive Bias Current corresponds to current flowing into the device.
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMP8640 LMP8640HV
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LMP8640
LMP8640HV
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
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2.7V Electrical Characteristics (1) (continued)
Unless otherwise specified, all limits ensured for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 2.7V, V− = 0V, −2V < VCM <
76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Parameter
VCM =5V, CL = 30 pF, RL = 1MΩ,
LMP8640-T LMP8640HV-T VSENSE =100mVpp,
LMP8640-F LMP8640HV-F VSENSE =40mVpp,
LMP8640-H LMP8640HV-H VSENSE =20mVpp,
(7) (5)
SR
Slew Rate
RIN
Differential Mode Input Impedance (5)
IS
Typ (3)
VOUT
5
kΩ
420
600
800
VCM = −2V
2000
2500
2750
2.65
µA
V
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
LMP8640-F LMP8640HV-F
VCM = 2.1V
40
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
Max Output Capacitance Load (5)
CLOAD
Unit
V/µs
VCM = 2.1V
VCM = 2.1V
Minimum Output Voltage
Max (2)
1.4
Supply Current
Maximum Output Voltage
(7)
Min (2)
Test Conditions
30
mV
pF
The number specified is the average of rising and falling slew rates and measured at 90% to 10%.
5V Electrical Characteristics
(1)
Unless otherwise specified, all limits ensured for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 5V, V− = 0V, −2V < VCM <
76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Max (2)
Unit
900
1160
µV
VCM = 2.1V
2.6
µV/°C
VCM = 2.1V
13
21
28
µA
f > 10 kHz
Parameter
VOS
Input Offset Voltage
TCVOS
Input Bias Current
eni
PSRR
(1)
(2)
(3)
(4)
(5)
(6)
4
(6)
Input Voltage Noise
Gain AV
(4) (5)
(5)
Typ (3)
-900
-1160
VCM = 2.1V
Input Offset Voltage Drift
IB
Min (2)
Test Conditions
117
nV/√Hz
Fixed Gain LMP8640-T
LMP8640HV-T
20
V/V
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
Fixed Gain LMP8640-H
LMP8640HV-H
100
V/V
-0.25
-0.51
Gain error
VCM = 2.1V
Accuracy over temperature (5)
−40°C to 125°C, VCM=2.1V
Power Supply Rejection Ratio
+
VCM = 2.1V, 2.7V < V < 12V,
85
0.25
0.51
%
26.2
ppm/°C
dB
Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very
limited self-heating of the device such that TJ = TA. No specification of parametric performance is indicated in the electrical tables under
conditions of internal self-heating where TJ > TA. Absolute Maximum Ratings indicate junction temperature limits beyond which the
device may be permanently degraded, either mechanically or electrically.
Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using
statistical quality control (SQC) method.
Typical values represent the most likely parametric norm at the time of characterization. Actual typical values may vary over time and
will also depend on the application and configuration. The typical values are not tested and are not ensured on shipped production
material.
Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature
change.
This parameter is ensured by design and/or characterization and is not tested in production.
Positive Bias Current corresponds to current flowing into the device.
Submit Documentation Feedback
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMP8640 LMP8640HV
LMP8640
LMP8640HV
www.ti.com
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
5V Electrical Characteristics (1) (continued)
Unless otherwise specified, all limits ensured for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 5V, V− = 0V, −2V < VCM <
76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Parameter
CMRR
BW
Common Mode Rejection Ratio
103
LMP8640HV 2.1V < VCM < 76V
95
-2V <VCM < 2V,
60
950
Fixed Gain LMP8640-F
LMP8640HV-F (5)
DC VSENSE =27 mV,
CL = 30 pF ,RL= 1MΩ
450
Fixed Gain LMP8640-H
LMP8640HV-H (5)
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
230
VCM =5V, CL = 30 pF, RL = 1MΩ,
LMP8640-T LMP8640HV-T VSENSE =200mVpp,
LMP8640-F LMP8640HV-F VSENSE =80mVpp,
LMP8640-H LMP8640HV-H VSENSE =40mVpp,
1.6
(7) (5)
RIN
Differential Mode Input Impedance (5)
VOUT
CLOAD
kHz
V/µs
kΩ
VCM = 2.1V
500
722
922
VCM = −2V
2050
2500
2750
VCM = 2.1V
Minimum Output Voltage
Unit
5
Supply Current
Maximum Output Voltage
Max (2)
dB
DC VSENSE = 67.5 mV,
CL = 30 pF ,RL= 1MΩ
Slew Rate
(7)
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
Typ (3)
Fixed Gain LMP8640-T
LMP8640HV-T (5)
SR
IS
Min (2)
Test Conditions
µA
4.95
V
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
LMP8640-F LMP8640HV-F
VCM = 2.1V
40
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
Max Output Capacitance Load (5)
mV
30
pF
The number specified is the average of rising and falling slew rates and measured at 90% to 10%.
12V Electrical Characteristics (1)
Unless otherwise specified, all limits ensured for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 12V, V− = 0V, −2V < VCM <
76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Max (2)
Unit
900
1160
µV
VCM = 2.1V
2.6
µV/°C
VCM = 2.1V
13
22
28
µA
f > 10 kHz
117
Parameter
Test Conditions
VOS
Input Offset Voltage
TCVOS
Input Offset Voltage Drift (4)
Input Bias Current
eni
Input Voltage Noise
(2)
(3)
(4)
(5)
(6)
(5)
(6)
IB
(1)
VCM = 2.1V
(5)
Min (2)
Typ (3)
-900
-1160
nV/√Hz
Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very
limited self-heating of the device such that TJ = TA. No specification of parametric performance is indicated in the electrical tables under
conditions of internal self-heating where TJ > TA. Absolute Maximum Ratings indicate junction temperature limits beyond which the
device may be permanently degraded, either mechanically or electrically.
Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using
statistical quality control (SQC) method.
Typical values represent the most likely parametric norm at the time of characterization. Actual typical values may vary over time and
will also depend on the application and configuration. The typical values are not tested and are not ensured on shipped production
material.
Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature
change.
This parameter is ensured by design and/or characterization and is not tested in production.
Positive Bias Current corresponds to current flowing into the device.
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMP8640 LMP8640HV
Submit Documentation Feedback
5
LMP8640
LMP8640HV
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
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12V Electrical Characteristics(1) (continued)
Unless otherwise specified, all limits ensured for at TA = 25°C, VS=V+ – V-, VSENSE= +IN-(-IN), V+ = 12V, V− = 0V, −2V < VCM <
76V, RL = 10MΩ. Boldface limits apply at the temperature extremes.
Parameter
Gain AV
PSRR
CMRR
BW
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
Fixed Gain LMP8640-H
LMP8640HV-H
100
V/V
VCM = 2.1V
Accuracy over temperature (5)
−40°C to 125°C, VCM=2.1V
+
Power Supply Rejection Ratio
Common Mode Rejection Ratio
VCM = 2.1V, 2.7V < V < 12V,
85
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
103
LMP8640HV 2.1V < VCM < 76V
95
-2V <VCM < 2V,
60
950
Fixed Gain LMP8640-F
LMP8640HV-F (5)
DC VSENSE =27 mV,
CL = 30 pF ,RL= 1MΩ
450
Fixed Gain LMP8640-H
LMP8640HV-H (5)
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
230
VCM =5V, CL = 30 pF, RL = 1MΩ,
LMP8640-T LMP8640HV-T VSENSE =500mVpp,
LMP8640-F LMP8640HV-F VSENSE =200mVpp,
LMP8640-H LMP8640HV-H VSENSE =100mVpp,
1.8
Max Output Capacitance Load
26.2
ppm/°C
kHz
V/µs
5
kΩ
VCM = 2.1V
720
1050
1250
VCM = −2V
2300
2800
3000
Supply Current
VCM = 2.1V
Minimum Output Voltage
%
dB
DC VSENSE = 67.5 mV,
CL = 30 pF ,RL= 1MΩ
(7) (5)
0.25
0.51
dB
Fixed Gain LMP8640-T
LMP8640HV-T (5)
Maximum Output Voltage
6
-0.25
-0.51
Gain error
Differential Mode Input Impedance (5)
CLOAD
Unit
V/V
RIN
VOUT
Max (2)
20
Slew Rate
(7)
(8)
Typ (3)
Fixed Gain LMP8640-T
LMP8640HV-T
SR
IS
Min (2)
Test Conditions
11.85
V
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
LMP8640-F LMP8640HV-F
VCM = 2.1V
40
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
(8)
µA
30
mV
pF
The number specified is the average of rising and falling slew rates and measured at 90% to 10%.
This parameter is ensured by design and/or characterization and is not tested in production.
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Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMP8640 LMP8640HV
LMP8640
LMP8640HV
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SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
DEVICE INFORMATION
Block Diagram
+IN
-IN
RIN LMP8640
RIN
+
LMP8640HV
+
V
G
VOUT
RG = 2*RIN
V
-
Connection Diagram
Top View
VOUT
V
-
+IN
1
2
LMP8640
LMP8640HV
3
+
6
V
5
NC
4
-IN
Figure 1. 6-Pin SOT Package
see package number DDC0006A
Table 1. Pin Descriptions
Pin
Name
1
VOUT
Description
2
V-
3
+IN
Positive Input
4
-IN
Negative Input
5
NC
Not Connected
6
V+
Positive Supply Voltage
Single Ended Output
Negative Supply Voltage
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Product Folder Links: LMP8640 LMP8640HV
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LMP8640HV
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Typical Performance Characteristics
Unless otherwise specified: TA = 25°C, VS=V+-V-, VSENSE= +IN - (-IN), RL = 10 MΩ.
Supply Curent vs. Supply Voltage
2300
2400
2100
VCM=-2V
2500
2300
2200
2100
25°C
-40°C
125°C
1700
IS (PA)
125°C
1300
1100
600
500
8.0
10.6
-40°C
700
500
400
5.3
25°C
900
300
-2 -1 0
13.2
|
700
300
2.7
1500
1
2
3
VS (V)
VCM (V)
Figure 2.
2300
Figure 3.
Supply Current vs. VCM
1700
1900
125°C
IS (PA)
IS (PA)
2100
1300
1700
-40°C
900
1100
900
500
700
|
700
1
2
3
125 °C
1500
1300
25°C
300
-2 -1 0
VS = 12V
2300
1900
1100
Supply Current vs. VCM
2500
VS = 5V
2100
1500
25°C
-40°C
500
-2 -1 0
4 16 28 40 52 64 76
1
2
VCM (V)
4 16 28 40 52 64 76
Figure 5.
CMRR vs. VCM (Gain 20V/V)
CMRR vs. VCM (Gain 50V/V)
140
130
130
120
25°C
120
CMRR (dB)
CMRR (dB)
3
VCM (V)
Figure 4.
140
4 16 28 40 52 64 76
|
|
800
VS = 2.7V
1900
VCM = 2.1V
1900
|
IS (PA)
2000
Supply Current vs. VCM
125 °C
110
-40°C
100
-40°C
25°C
110
100
90
90
VS = 5V
80
-2
11
24
37
50
63
VS = 5V
76
80
-2
11
VCM (V)
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24
37
50
63
76
V CM (V)
Figure 6.
8
125°C
Figure 7.
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMP8640 LMP8640HV
LMP8640
LMP8640HV
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SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
Typical Performance Characteristics (continued)
Unless otherwise specified: TA = 25°C, VS=V+-V-, VSENSE= +IN - (-IN), RL = 10 MΩ.
CMRR vs. VCM (Gain 100V/V)
Input Voltage Offset vs. VCM
200
140
VS = 5V
-40°C
150
130
CMRR (dB)
25°C
VOS (PV)
100
120
125°C
110
125 °C
50
0
25°C
-50
100
-100
90
-40°C
-150
V S = 5V
80
-2
11
24
37
50
63
-200
-2
76
11
24
37
0
0
-100
-200 -40°C
-40°C
-200
125°C
-300
(µA)
IB (PV)
(µA)
IB (PV)
Ibias vs. VCM
100
-100
25°C
125 °C
-300
-400
-500
-500
-600
-600
25°C
-700
-700
-800
-800
VS = 2.7V
-900
-2 -1 0
1
2
3
VS = 5V
-900
-2 -1 0
4 16 28 40 52 64 76
1
2
3
4 16 28 40 52 64 76
VCM (V)
VCM (V)
Figure 10.
Figure 11.
Ibias vs. VCM
100
Gain vs. Frequency
50
0
-100
76
Figure 9.
Ibias vs. VCM
-400
63
V CM (V)
V CM (V)
Figure 8.
100
50
VS =5V, VCM=5V
GAIN 100V/V
-40°C
40
125°C
-300
-400
GAIN (dB)
IB (PV)
(µA)
-200
25°C
-500
30
GAIN 50V/V
-600
20
GAIN 20V/V
-700
-800
-900
-2 -1 0
VS = 12V
1
2
3
4 16 28 40 52 64 76
10
100
VCM (V)
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 12.
Figure 13.
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Product Folder Links: LMP8640 LMP8640HV
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LMP8640
LMP8640HV
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
www.ti.com
Typical Performance Characteristics (continued)
13.0
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0
Output voltage vs. VSENSE
Output voltage vs. VSENSE (ZOOM close to 0V)
300
VS =12V, VCM =12V
V S=12V, VCM=12V
250
GAIN 100V/V
200
VOUT (mV)
VOUT (V)
Unless otherwise specified: TA = 25°C, VS=V+-V-, VSENSE= +IN - (-IN), RL = 10 MΩ.
GAIN 100V/V
GAIN 50V/V
150
100
GAIN 20V/V
GAIN 50V/V
50
GAIN 20V/V
100
200
300
400
500
0
-3
600
-2
VSENSE (mV)
-1
0
1
2
3
VSENSE (mV)
Figure 14.
Figure 15.
Large Step response
Small Step response
VSENSE
GAIN 50V/V
GAIN 100V/V
GAIN 50V/V
GAIN 20V/V
GAIN 20V/V
VSENS E (10 mV/DIV)
GAIN 100
VOUT (100 mV/DIV)
VS ENS E (20 mV/DIV)
VOUT (500 mV/DIV)
V SENSE
V S = 5V, VCM = 12V
VS =12V, VCM =12V
TIME (2 Ps/DIV)
TIME (2 Ps/DIV)
Figure 16.
Figure 17.
Settling time (fall)
Settling time (rise)
VS = 5V, VCM = 12V
GAIN 100V/V
GAIN 100 V/V
V SENSE
GAIN 50V/V
GAIN 20V/V
VSE NSE (10 mV/DIV)
GAIN 20V/V
VOUT (100 mV/DIV)
GAIN 50V/V
V SE NS E (10 mV/DIV)
V OUT (100 mV/DIV)
V SENSE
VS = 5V, V CM = 12V
TIME (400 ns /DIV)
TIME (400 ns/DIV)
Figure 18.
10
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Figure 19.
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMP8640 LMP8640HV
LMP8640
LMP8640HV
www.ti.com
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
Typical Performance Characteristics (continued)
Unless otherwise specified: TA = 25°C, VS=V+-V-, VSENSE= +IN - (-IN), RL = 10 MΩ.
V OUT
VCM
VCM (5V/DIV)
VCM (5V/DIV)
V CM
Common mode step response (fall)
VOUT (50 mV/DIV)
V OUT (20 mV/DIV)
Common mode step response (rise)
VOUT
VS = 5V, GAIN 20 V/V
VS = 5V, GAIN 20 V/V
TIME (4 és/DIV)
TIME (4 és/DIV)
Figure 20.
Figure 21.
Load regulation (Sinking)
2.6
2.505
Load regulation (Sourcing)
VS =5V, VCM=12V
2.504
2.5
GAIN 100 V/V
2.4
2.502
GAIN 50
GAIN 100V/V
2.3
V OUT (V)
V OUT (V)
2.503
2.2
2.501
GAIN 50
2.1
GAIN 20V/V
2.500
2.0
GAIN 20V/V
1.9
0
2.499
1
2
3
4
VS =5V, VCM=12V
2.498
0
1
2
3
4
5
6
7
8
9
5
6
7
8
9
10
I OUT (mA)
10
I OUT (mA)
Figure .
Figure 22.
AC PSRR vs. Frequency
AC CMRR vs. Frequency
110
100
V S = 5V, V CM = 12V
VS = 5V, VCM = 12V
90
CMRR (dB)
PSRR (dB)
80
60
GAIN 20V/V
40
70
GAIN 100V/V
50
GAIN 50V/V
GAIN 100 V/V
20
30
GAIN 20V/V
GAIN 50V/V
0
10
100
1k
10k
100k
1M
10
1
FREQUENCY (Hz)
Figure 23.
10
100
1k
10k
100k
Frequency (Hz)
Figure 24.
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMP8640 LMP8640HV
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LMP8640
LMP8640HV
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
www.ti.com
APPLICATION INFORMATION
GENERAL
The LMP8640 and LMP8640HV are single supply high side current sense amplifiers with a fixed gain of 20V/V,
50V/V, 100V/V and a common mode voltage range of -2V to 42V or -2V to 76V depending on the grade.
THEORY OF OPERATION
As seen from the picture below, the current flowing through RS develops a voltage drop equal to VSENSE across
RS. The high impedance inputs of the amplifier doesn’t conduct this current and the high open loop gain of the
sense amplifier forces its non-inverting input to the same voltage as the inverting input. In this way the voltage
drop across RIN matches VSENSE. A current proportional to IS according to the following relation:
IG = VSENSE/RIN = RS*IS/RIN ,
(1)
flows entirely in the internal gain resistor RG developing a voltage drop equal to
VRG = IG *RG = (VSENSE/RIN) *RG = ((RS*IS)/RIN)*RG
(2)
This voltage is buffered and showed at the output with a very low impedance allowing a very easy interface of
the LMP8640 with other ICs (ADC, µC…).
VOUT = 2*(RS*IS)*G,
(3)
where G=RG/RIN = 10V/V, 25V/V, 50V/V, according to the gain options.
VSENSE
Is
+
Rs
+IN
-IN
RIN
+
LMP8640
RIN
L
o
a
d
+
V
IG
G
VOUT
RG = 2*RIN
V
-
Figure 25. Current Monitor
SELECTION OF THE SHUNT RESISTOR
The value chosen for the shunt resistor, RS, depends on the application. It plays a big role in a current sensing
system and must be chosen with care. The selection of the shunt resistor needs to take in account the smallsignal accuracy, the power dissipated and the voltage loss across the shunt itself. In applications where a small
current is sensed, a bigger value of RS is selected to minimize the error in the proportional output voltage. Higher
resistor value improves the SNR at the input of the current sense amplifier and hence gives an accurate output.
Similarly when high current is sensed, the power losses in RS can be significant so a smaller value of RS is
suggested. In this condition is required to take in account also the power rating of RS resistor. The low input
offset of the LMP8640 allows the use of small sense resistors to reduce power dissipation still providing a good
input dynamic range. The input dynamic range is the ratio expressed in dB between the maximum signal that can
be measured and the minimum signal that can be detected, usually the input offset is the principal limiting factor.
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LMP8640
LMP8640HV
www.ti.com
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
DRIVING ADC
The input stage of an Analog to Digital converter can be modeled with a resistor and a capacitance versus
ground. So if the voltage source doesn't have a low impedance an error in the amplitude's measurement will
occur. In this case a buffer is needed to drive the ADC. The LMP8640 has an internal output buffer able to drive
a capacitance load up to 30 pF or the input stage of an ADC. If required an external low pass RC filter can be
added at the output of the LMP8640 to reduce the noise and the bandwidth of the current sense.
IS
+
RS
+IN
-IN
RIN
+
L
o
a
d
LMP8640
RIN
+
V
+
VA
RF
G
ADC
VOUT
CF
RG = 2*RIN
-
V
Figure 26. LMP8640 to ADC Interface
DESIGN EXAMPLE
For example in a current monitor application is required to measure the current sunk by a load (peak current
10A) with a resolution of 10mA and 0.5% of accuracy. The 10bit analog to digital converter accepts a max input
voltage of 4.1V. Moreover in order to not burn much power on the shunt resistor it needs to be less than 10mΩ.
In the table below are summarized the other working condition.
Working Condition
Value
Min
Max
Supply Voltage
5V
5.5V
Common mode Voltage
48V
70V
Temperature
0°C
70°C
Signal BW
50kHz
First step – LMP8640 / LMP8640HV selection
The required common mode voltage of the application implies that the right choice is the LMP8640HV (High
common mode voltage up tp 76V).
Second step – Gain option selection
We can choose between three gain option (20V/V, 50V/V, 100V/V). considering the max input voltage of the
ADC (4.1V) , the max Sense voltage across the shunt resistor is evaluated according the following formula:
VSENSE= (MAX Vin ADC) / Gain;
hence the max VSENSE will be 205mV, 82mV, 41mV respectively. The shunt resistor are then evaluated
considering the maximum monitored current :
RS = (max VSENSE) / I_MAX
For each gain option the max shunt resistors are the following : 20.5mΩ, 8.2mΩ, 4.1mΩ respectively.
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMP8640 LMP8640HV
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LMP8640
LMP8640HV
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
www.ti.com
One of the project constraints requires RS<10mΩ, it means that the 20.5mΩ will be discarded and hence the
50V/V and 100V/V gain options are still in play.
Third step – Shunt resistor selection
At this point an error budget calculation, considering the calibration of the Gain, Offset, CMRR, and PSRR, helps
in the selection of the shunt resistor. In the table below the contribution of each error source is calculated
considering the values of the Electrical Characteristics table at 5V supply.
Table 2. Resolution Calculation
ERROR SOURCE
RS = 4.1mΩ
RS = 8.1mΩ
CMRR calibrated ad mid VCM range
77.9µV
77.9µV
PSRR calibrated at 5V
8.9µV
8.9µV
Total error (squared sum of contribution)
78µV
78µV
19.2mA
9.6mA
Resolution (Total error / RS)
Table 3. Accuracy Calculation
ERROR SOURCE
RS = 4.1mΩ
RS = 8.1mΩ
182µV
182µV
Nosie
216µV
216µV
Gain drift
75.2µV
151µV
Total error (squared sum of contribution)
293µV
320µV
0.7%
0.4%
Tc Vos
Accuracy 100*(Max_VSENSE / Total Error)
From the tables above is clear that the 8.2mΩ shunt resistor allows the respect of the project's constraints. The
power burned on the Shunt is 820mW at 10A.
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PACKAGE OPTION ADDENDUM
www.ti.com
15-Apr-2013
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
(2)
MSL Peak Temp
Op Temp (°C)
Top-Side Markings
(3)
(4)
LMP8640HVMK-F/NOPB
ACTIVE
SOT
DDC
6
1000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AD6A
LMP8640HVMK-H/NOPB
ACTIVE
SOT
DDC
6
1000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AF6A
LMP8640HVMK-T/NOPB
ACTIVE
SOT
DDC
6
1000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AB6A
LMP8640HVMKE-F/NOPB
ACTIVE
SOT
DDC
6
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AD6A
LMP8640HVMKE-H/NOPB
ACTIVE
SOT
DDC
6
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AF6A
LMP8640HVMKE-T/NOPB
ACTIVE
SOT
DDC
6
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AB6A
LMP8640HVMKX-F/NOPB
ACTIVE
SOT
DDC
6
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AD6A
LMP8640HVMKX-H/NOPB
ACTIVE
SOT
DDC
6
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AF6A
LMP8640HVMKX-T/NOPB
ACTIVE
SOT
DDC
6
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AB6A
LMP8640MK-F/NOPB
ACTIVE
SOT
DDC
6
1000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AC6A
LMP8640MK-H/NOPB
ACTIVE
SOT
DDC
6
1000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AE6A
LMP8640MK-T/NOPB
ACTIVE
SOT
DDC
6
1000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AA6A
LMP8640MKE-F/NOPB
ACTIVE
SOT
DDC
6
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AC6A
LMP8640MKE-H/NOPB
ACTIVE
SOT
DDC
6
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AE6A
LMP8640MKE-T/NOPB
ACTIVE
SOT
DDC
6
250
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AA6A
LMP8640MKX-F/NOPB
ACTIVE
SOT
DDC
6
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AC6A
LMP8640MKX-H/NOPB
ACTIVE
SOT
DDC
6
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
AE6A
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
Orderable Device
15-Apr-2013
Status
(1)
LMP8640MKX-T/NOPB
ACTIVE
Package Type Package Pins Package
Drawing
Qty
SOT
DDC
6
3000
Eco Plan
Lead/Ball Finish
(2)
Green (RoHS
& no Sb/Br)
MSL Peak Temp
Op Temp (°C)
Top-Side Markings
(3)
CU NIPDAU
Level-1-260C-UNLIM
(4)
-40 to 125
AA6A
(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.
(4)
Multiple Top-Side Markings will be inside parentheses. Only one Top-Side 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 Top-Side Marking for that device.
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 2
Samples
PACKAGE MATERIALS INFORMATION
www.ti.com
24-Apr-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
LMP8640HVMK-F/NOPB
SOT
DDC
6
1000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640HVMK-H/NOPB
SOT
DDC
6
1000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640HVMK-T/NOPB
SOT
DDC
6
1000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640HVMKE-F/NOPB
SOT
DDC
6
250
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640HVMKE-H/NOP
B
SOT
DDC
6
250
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640HVMKE-T/NOPB
SOT
DDC
6
250
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640HVMKX-F/NOPB
SOT
DDC
6
3000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640HVMKX-H/NOP
B
SOT
DDC
6
3000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640HVMKX-T/NOPB
SOT
DDC
6
3000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640MK-F/NOPB
SOT
DDC
6
1000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640MK-H/NOPB
SOT
DDC
6
1000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640MK-T/NOPB
SOT
DDC
6
1000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640MKE-F/NOPB
SOT
DDC
6
250
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640MKE-H/NOPB
SOT
DDC
6
250
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640MKE-T/NOPB
SOT
DDC
6
250
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640MKX-F/NOPB
SOT
DDC
6
3000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
LMP8640MKX-H/NOPB
SOT
DDC
6
3000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
24-Apr-2013
Device
LMP8640MKX-T/NOPB
Package Package Pins
Type Drawing
SOT
DDC
6
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
3000
178.0
8.4
3.2
B0
(mm)
K0
(mm)
P1
(mm)
3.2
1.4
4.0
W
Pin1
(mm) Quadrant
8.0
Q3
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
LMP8640HVMK-F/NOPB
SOT
DDC
6
1000
210.0
185.0
35.0
LMP8640HVMK-H/NOPB
SOT
DDC
6
1000
210.0
185.0
35.0
LMP8640HVMK-T/NOPB
SOT
DDC
6
1000
210.0
185.0
35.0
LMP8640HVMKE-F/NOPB
SOT
DDC
6
250
210.0
185.0
35.0
LMP8640HVMKE-H/NOPB
SOT
DDC
6
250
210.0
185.0
35.0
LMP8640HVMKE-T/NOPB
SOT
DDC
6
250
210.0
185.0
35.0
LMP8640HVMKX-F/NOPB
SOT
DDC
6
3000
210.0
185.0
35.0
LMP8640HVMKX-H/NOPB
SOT
DDC
6
3000
210.0
185.0
35.0
LMP8640HVMKX-T/NOPB
SOT
DDC
6
3000
210.0
185.0
35.0
LMP8640MK-F/NOPB
SOT
DDC
6
1000
210.0
185.0
35.0
LMP8640MK-H/NOPB
SOT
DDC
6
1000
210.0
185.0
35.0
LMP8640MK-T/NOPB
SOT
DDC
6
1000
210.0
185.0
35.0
LMP8640MKE-F/NOPB
SOT
DDC
6
250
210.0
185.0
35.0
LMP8640MKE-H/NOPB
SOT
DDC
6
250
210.0
185.0
35.0
LMP8640MKE-T/NOPB
SOT
DDC
6
250
210.0
185.0
35.0
LMP8640MKX-F/NOPB
SOT
DDC
6
3000
210.0
185.0
35.0
Pack Materials-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
24-Apr-2013
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
LMP8640MKX-H/NOPB
SOT
DDC
6
3000
210.0
185.0
35.0
LMP8640MKX-T/NOPB
SOT
DDC
6
3000
210.0
185.0
35.0
Pack Materials-Page 3
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