LMP8640HVMK-F [TI]
Precision High Voltage Current Sense Amplifier; 精密高电压电流检测放大器
| 型号： | LMP8640HVMK-F |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Precision High Voltage Current Sense Amplifier |
| 文件： | 总22页 (文件大小：1166K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LMP8640
LMP8640HV
www.ti.com
SNOSB28F –AUGUST 2010–REVISED APRIL 2013
Precision High Voltage Current Sense Amplifier
Check for Samples: LMP8640, LMP8640HV
1
FEATURES
DESCRIPTION
The LMP8640 and the LMP8640HV are precision
2
•
•
Typical Values, TA = 25°C
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.
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%
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
Low Offset Voltage: 900µV
Input Bias Current: 13 µA
PSRR: 85 dB
gains 20V/V, 50V/V, 100V/V ensuring
a gain
CMRR (2.1V to 42V): 103 dB
Temperature Range: -40°C to 125°C
6-Pin SOT Package
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
I
S
R
S
+IN
-IN
R
L
LMP8640
R
IN
IN
o
a
d
-
+
+
V
V
A
G
ADC
V
OUT
R
= 2*R
IN
G
-
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
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.
2
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.
(1)(2)(3)
Absolute Maximum Ratings
ESD Tolerance
(4)
Human Body Model
For input pins +IN, -IN
For all other pins
5000V
2000V
Machine Model
200V
Charge device model
1250V
Supply Voltage (VS = V+ - V−)
Differential Voltage +IN- (-IN)
Voltage at pins +IN, -IN
13.2V
6V
LMP8640HV
LMP8640
-6V to 80V
-6V to 60V
V-to V+
Voltage at VOUT pin
Storage Temperature Range
-65°C to 150°C
150°C
(5)
Junction Temperature
(1) “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.
(2) For soldering specifications,see product folder at www.ti.com and http://www.ti.com/lit/SNOA549.
(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(4) 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).
(5) 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
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Product Folder Links: LMP8640 LMP8640HV
LMP8640
LMP8640HV
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SNOSB28F –AUGUST 2010–REVISED APRIL 2013
(1)
Operating Ratings
Supply Voltage (VS = V+ - V−)
2.7V to 12V
(2)
Temperature Range
-40°C to 125°C
Package Thermal Resistance(2)
SOT-6
96°C/W
(1) “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.
(2) 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.
(1)
2.7V Electrical Characteristics
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
Min(2)
Typ(3)
Max(2)
Unit
-900
-1160
900
1160
VOS
TCVOS
IB
Input Offset Voltage
VCM = 2.1V
VCM = 2.1V
VCM = 2.1V
f > 10 kHz
µV
Input Offset Voltage Drift(4) (5)
2.6
µV/°C
µA
20
27
(6)
Input Bias Current
12
117
20
(5)
eni
Input Voltage Noise
nV/√Hz
Fixed Gain LMP8640-T
LMP8640HV-T
V/V
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
V/V
%
Gain AV
Fixed Gain LMP8640-H
LMP8640HV-H
100
-0.25
-0.51
0.25
0.51
Gain error
VCM = 2.1V
Accuracy over temperature(5)
Power Supply Rejection Ratio
−40°C to 125°C, VCM=2.1V
VCM = 2.1V, 2.7V < V+ < 12V,
26.2
ppm/°C
dB
PSRR
CMRR
85
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
103
Common Mode Rejection Ratio
Fixed Gain LMP8640-T
dB
LMP8640HV 2.1V < VCM < 76V
-2V <VCM < 2V,
95
60
DC VSENSE = 67.5 mV,
CL = 30 pF,RL= 1MΩ
950
450
230
(5)
LMP8640HV-T
Fixed Gain LMP8640-F
DC VSENSE =27 mV,
CL = 30 pF, RL= 1MΩ
BW
kHz
(5)
LMP8640HV-F
Fixed Gain LMP8640-H
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
(5)
LMP8640HV-H
(1) 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.
(2) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using
statistical quality control (SQC) method.
(3) 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.
(4) Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature
change.
(5) This parameter is ensured by design and/or characterization and is not tested in production.
(6) Positive Bias Current corresponds to current flowing into the device.
Copyright © 2010–2013, Texas Instruments Incorporated
Submit Documentation Feedback
3
Product Folder Links: LMP8640 LMP8640HV
LMP8640
LMP8640HV
SNOSB28F –AUGUST 2010–REVISED APRIL 2013
www.ti.com
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
Test Conditions
Min(2)
Typ(3)
Max(2)
Unit
V/µs
kΩ
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
RIN
Slew Rate
1.4
Differential Mode Input Impedance(5)
Supply Current
5
600
800
VCM = 2.1V
420
IS
µA
V
2500
2750
VCM = −2V
2000
Maximum Output Voltage
VCM = 2.1V
2.65
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
40
VOUT
LMP8640-F LMP8640HV-F
VCM = 2.1V
Minimum Output Voltage
mV
pF
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
CLOAD
Max Output Capacitance Load(5)
30
(7) The number specified is the average of rising and falling slew rates and measured at 90% to 10%.
(1)
5V Electrical Characteristics
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
Test Conditions
Min(2)
Typ(3)
Max(2)
Unit
-900
-1160
900
1160
VOS
TCVOS
IB
Input Offset Voltage
VCM = 2.1V
VCM = 2.1V
VCM = 2.1V
f > 10 kHz
µV
Input Offset Voltage Drift(4) (5)
2.6
µV/°C
µA
21
28
(6)
Input Bias Current
13
117
20
(5)
eni
Input Voltage Noise
nV/√Hz
Fixed Gain LMP8640-T
LMP8640HV-T
V/V
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
V/V
%
Gain AV
PSRR
Fixed Gain LMP8640-H
LMP8640HV-H
100
-0.25
-0.51
0.25
0.51
Gain error
VCM = 2.1V
Accuracy over temperature(5)
Power Supply Rejection Ratio
−40°C to 125°C, VCM=2.1V
VCM = 2.1V, 2.7V < V+ < 12V,
26.2
ppm/°C
dB
85
(1) 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.
(2) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using
statistical quality control (SQC) method.
(3) 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.
(4) Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature
change.
(5) This parameter is ensured by design and/or characterization and is not tested in production.
(6) Positive Bias Current corresponds to current flowing into the device.
4
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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
Test Conditions
Min(2)
Typ(3)
Max(2)
Unit
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
103
CMRR
BW
Common Mode Rejection Ratio
Fixed Gain LMP8640-T
dB
LMP8640HV 2.1V < VCM < 76V
-2V <VCM < 2V,
95
60
DC VSENSE = 67.5 mV,
CL = 30 pF ,RL= 1MΩ
950
450
230
(5)
LMP8640HV-T
Fixed Gain LMP8640-F
LMP8640HV-F(5)
DC VSENSE =27 mV,
CL = 30 pF ,RL= 1MΩ
kHz
Fixed Gain LMP8640-H
LMP8640HV-H(5)
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
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,
(7) (5)
SR
RIN
Slew Rate
1.6
V/µs
Differential Mode Input Impedance(5)
Supply Current
5
kΩ
722
922
VCM = 2.1V
500
IS
µA
V
2500
2750
VCM = −2V
2050
Maximum Output Voltage
VCM = 2.1V
4.95
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
40
VOUT
LMP8640-F LMP8640HV-F
VCM = 2.1V
Minimum Output Voltage
mV
pF
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
CLOAD
Max Output Capacitance Load(5)
30
(7) 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.
<
Parameter
Test Conditions
Min(2)
Typ(3)
Max(2)
Unit
-900
-1160
900
1160
VOS
TCVOS
IB
Input Offset Voltage
VCM = 2.1V
VCM = 2.1V
VCM = 2.1V
f > 10 kHz
µV
Input Offset Voltage Drift(4) (5)
2.6
µV/°C
µA
22
28
(6)
Input Bias Current
13
(5)
eni
Input Voltage Noise
117
nV/√Hz
(1) 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.
(2) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlations using
statistical quality control (SQC) method.
(3) 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.
(4) Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature
change.
(5) This parameter is ensured by design and/or characterization and is not tested in production.
(6) Positive Bias Current corresponds to current flowing into the device.
Copyright © 2010–2013, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Links: LMP8640 LMP8640HV
LMP8640
LMP8640HV
SNOSB28F –AUGUST 2010–REVISED APRIL 2013
www.ti.com
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
Test Conditions
Min(2)
Typ(3)
Max(2)
Unit
Fixed Gain LMP8640-T
LMP8640HV-T
20
V/V
Fixed Gain LMP8640-F
LMP8640HV-F
50
V/V
V/V
%
Gain AV
Fixed Gain LMP8640-H
LMP8640HV-H
100
-0.25
-0.51
0.25
0.51
Gain error
VCM = 2.1V
Accuracy over temperature(5)
Power Supply Rejection Ratio
−40°C to 125°C, VCM=2.1V
VCM = 2.1V, 2.7V < V+ < 12V,
26.2
ppm/°C
dB
PSRR
CMRR
85
LMP8640HV 2.1V < VCM < 42V
LMP8640 2.1V < VCM< 42V
103
Common Mode Rejection Ratio
Fixed Gain LMP8640-T
dB
LMP8640HV 2.1V < VCM < 76V
-2V <VCM < 2V,
95
60
DC VSENSE = 67.5 mV,
CL = 30 pF ,RL= 1MΩ
950
450
230
(5)
LMP8640HV-T
Fixed Gain LMP8640-F
DC VSENSE =27 mV,
CL = 30 pF ,RL= 1MΩ
BW
kHz
(5)
LMP8640HV-F
Fixed Gain LMP8640-H
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
(5)
LMP8640HV-H
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,
(7) (5)
SR
RIN
Slew Rate
1.8
V/µs
Differential Mode Input Impedance(5)
Supply Current
5
kΩ
1050
1250
VCM = 2.1V
720
IS
µA
V
2800
3000
VCM = −2V
2300
Maximum Output Voltage
VCM = 2.1V
11.85
LMP8640-T LMP8640HV-T
VCM = 2.1V
18.2
40
VOUT
LMP8640-F LMP8640HV-F
VCM = 2.1V
Minimum Output Voltage
mV
pF
LMP8640-H LMP8640HV-H
VCM = 2.1V
80
CLOAD
Max Output Capacitance Load(8)
30
(7) The number specified is the average of rising and falling slew rates and measured at 90% to 10%.
(8) This parameter is ensured by design and/or characterization and is not tested in production.
6
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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
LMP8640
LMP8640HV
R
R
IN
IN
-
+
+
V
G
V
OUT
R
G
= 2*R
IN
-
V
Connection Diagram
Top View
+
6
5
4
V
1
2
3
V
OUT
LMP8640
LMP8640HV
-
NC
-IN
V
+IN
Figure 1. 6-Pin SOT Package
see package number DDC0006A
Table 1. Pin Descriptions
Pin
1
Name
VOUT
V-
Description
Single Ended Output
2
Negative Supply Voltage
Positive Input
3
+IN
-IN
4
Negative Input
5
NC
Not Connected
6
V+
Positive Supply Voltage
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Product Folder Links: LMP8640 LMP8640HV
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LMP8640HV
SNOSB28F –AUGUST 2010–REVISED APRIL 2013
www.ti.com
Typical Performance Characteristics
Unless otherwise specified: TA = 25°C, VS=V+-V-, VSENSE= +IN - (-IN), RL = 10 MΩ.
Supply Curent vs. Supply Voltage
Supply Current vs. VCM
VS =2.7V
2300
2100
1900
1700
1500
1300
1100
900
2500
2400
2300
2200
2100
2000
1900
800
125°C
ö
ö
700
-40°C
600
700
500
500
400
300
2.7
300
-2 -1
5.3
8.0
10.6
13.2
0
1
2
3
4 16 28 40 52 64 76
VS (V)
Figure 2.
VCM (V)
Figure 3.
Supply Current vs. VCM
VS = 5V
Supply Current vs. VCM
VS = 12V
2300
2100
1900
1700
1500
1300
1100
900
2500
2300
2100
1900
1700
1500
1300
1100
900
125°C
125 °C
25°C
-40°C
25°C
-40°C
700
500
700
300
-2 -1
500
-2 -1
0
1
2
3
4
16 28 40 52 64 76
0
1
2
3
4
16 28 40 52 64 76
VCM (V)
Figure 4.
VCM (V)
Figure 5.
CMRR vs. VCM (Gain 20V/V)
CMRR vs. VCM (Gain 50V/V)
140
130
120
110
100
90
140
130
120
110
100
90
25°C
-40°C
125 °C
25°C
125°C
-40°C
V
= 5V
V
= 5V
S
S
80
-2
80
-2
11
24
37
50
63
76
11
24
37
50
63
76
V
(V)
V
(V)
CM
CM
Figure 6.
Figure 7.
8
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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
V
S
= 5V
-40°C
150
100
50
130
120
110
100
90
125 °C
25°C
125°C
0
25°C
-50
-100
-150
-200
-40°C
V
= 5V
S
80
-2
-2
11
24
37
50
63
76
11
24
37
50
63
76
V
(V)
V
(V)
CM
CM
Figure 8.
Figure 9.
Ibias vs. VCM
Ibias vs. VCM
100
0
100
0
-40°C
-100
-200
-300
-400
-500
-600
-700
-800
-900
-100
-200
-300
-400
-500
-600
-700
-800
-900
-40°C
125°C
125 °C
25°C
25°C
V
= 2.7V
V = 5V
S
S
-2 -1
0
1
2
3
4
16 28 40 52 64 76
(V)
-2 -1
0
1
2
3
4
16 28 40 52 64 76
(V)
V
V
CM
CM
Figure 10.
Figure 11.
Gain vs. Frequency
VS=5V, VCM=5V
Ibias vs. VCM
100
0
50
40
30
20
10
-100
-200
-300
-400
-500
-600
-700
-800
-900
-2 -1
0
1
2
3
4
16 28 40 52 64 76
(V)
100
1k
10k
100k
1M
10M
V
CM
FREQUENCY (Hz)
Figure 12.
Figure 13.
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Typical Performance Characteristics (continued)
Unless otherwise specified: TA = 25°C, VS=V+-V-, VSENSE= +IN - (-IN), RL = 10 MΩ.
Output voltage vs. VSENSE
Output voltage vs. VSENSE (ZOOM close to 0V)
13.0
12.0
11.0
10.0
9.0
300
250
200
150
100
50
VS=12V, VCM=12V
VS=12V, VCM=12V
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0
0
-3
100
200
300
400
500
600
-2
-1
0
1
2
3
VSENSE (mV)
Figure 14.
VSENSE (mV)
Figure 15.
Large Step response
Small Step response
V
= 5V, V = 12V
CM
S
VS=12V, VCM=12V
TIME (2 ms/DIV)
TIME (2 ms/DIV)
Figure 16.
Figure 17.
Settling time (fall)
Settling time (rise)
VS = 5V, VCM = 12V
VS = 5V, VCM= 12V
TIME (400 ns/DIV)
TIME (400 ns/DIV)
Figure 18.
Figure 19.
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Typical Performance Characteristics (continued)
Unless otherwise specified: TA = 25°C, VS=V+-V-, VSENSE= +IN - (-IN), RL = 10 MΩ.
Common mode step response (rise)
Common mode step response (fall)
V
CM
V
CM
V
OUT
V
OUT
V
S
= 5V, GAIN 20 V/V
V
= 5V, GAIN 20 V/V
S
TIME (4 és/DIV)
TIME (4 és/DIV)
Figure 20.
Figure 21.
Load regulation (Sinking)
Load regulation (Sourcing)
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
2.505
2.504
2.503
2.502
2.501
2.500
2.499
2.498
VS=5V, VCM=12V
0
1
2
3
4
5
6
7
8
9
10
VS=5V, VCM=12V
IOUT (mA)
0
1
2
3
4
5
6
7
8
9
10
IOUT (mA)
Figure .
Figure 22.
AC CMRR vs. Frequency
AC PSRR vs. Frequency
110
90
70
50
30
10
100
80
60
40
20
0
V
= 5V, V
= 12V
V
= 5V, V
CM
= 12V
S
S
CM
GAIN 100V/V
GAIN 50V/V
GAIN 20V/V
GAIN 100 V/V
GAIN 50V/V
GAIN 20V/V
1k
10
100
1k
10k
100k
1M
1
10
100
10k
100k
FREQUENCY (Hz)
Frequency (Hz)
Figure 23.
Figure 24.
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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.
V
SENSE
I
s
R
s
+IN
-IN
R
LMP8640
R
IN
IN
L
o
a
d
-
+
+
V
I
G
V
OUT
G
R
G
= 2*R
IN
-
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 small-
signal 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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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.
I
S
R
S
+IN
-IN
R
L
o
a
d
LMP8640
R
IN
IN
-
+
+
V
V
A
R
F
G
ADC
V
OUT
C
F
R
= 2*R
G
IN
-
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.
Value
Working Condition
Min
5V
Max
5.5V
70V
Supply Voltage
Common mode Voltage
Temperature
48V
0°C
70°C
50kHz
Signal BW
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.
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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
CMRR calibrated ad mid VCM range
PSRR calibrated at 5V
RS = 4.1mΩ
77.9µV
8.9µV
RS = 8.1mΩ
77.9µV
8.9µV
Total error (squared sum of contribution)
Resolution (Total error / RS)
78µV
78µV
19.2mA
9.6mA
Table 3. Accuracy Calculation
ERROR SOURCE
RS = 4.1mΩ
182µV
RS = 8.1mΩ
182µV
Tc Vos
Nosie
216µV
216µV
Gain drift
75.2µV
293µV
151µV
Total error (squared sum of contribution)
Accuracy 100*(Max_VSENSE / Total Error)
320µV
0.7%
0.4%
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
LMP8640HVMK-F/NOPB
LMP8640HVMK-H/NOPB
LMP8640HVMK-T/NOPB
LMP8640HVMKE-F/NOPB
LMP8640HVMKE-H/NOPB
LMP8640HVMKE-T/NOPB
LMP8640HVMKX-F/NOPB
LMP8640HVMKX-H/NOPB
LMP8640HVMKX-T/NOPB
LMP8640MK-F/NOPB
Status Package Type Package Pins Package
Eco Plan Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
-40 to 125
Top-Side Markings
Samples
Drawing
Qty
(1)
(2)
(3)
(4)
ACTIVE
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
DDC
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
1000
Green (RoHS
& no Sb/Br)
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
CU NIPDAU
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
AD6A
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
1000
1000
250
Green (RoHS
& no Sb/Br)
AF6A
AB6A
AD6A
AF6A
AB6A
AD6A
AF6A
AB6A
AC6A
AE6A
AA6A
AC6A
AE6A
AA6A
AC6A
AE6A
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
250
Green (RoHS
& no Sb/Br)
250
Green (RoHS
& no Sb/Br)
3000
3000
3000
1000
1000
1000
250
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
LMP8640MK-H/NOPB
Green (RoHS
& no Sb/Br)
LMP8640MK-T/NOPB
Green (RoHS
& no Sb/Br)
LMP8640MKE-F/NOPB
LMP8640MKE-H/NOPB
LMP8640MKE-T/NOPB
LMP8640MKX-F/NOPB
LMP8640MKX-H/NOPB
Green (RoHS
& no Sb/Br)
250
Green (RoHS
& no Sb/Br)
250
Green (RoHS
& no Sb/Br)
3000
3000
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
15-Apr-2013
Orderable Device
LMP8640MKX-T/NOPB
Status Package Type Package Pins Package
Eco Plan Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
Top-Side Markings
Samples
Drawing
Qty
(1)
(2)
(3)
(4)
ACTIVE
SOT
DDC
6
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-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
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
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
LMP8640HVMK-F/NOPB
LMP8640HVMK-H/NOPB
LMP8640HVMK-T/NOPB
SOT
SOT
SOT
DDC
DDC
DDC
DDC
DDC
6
6
6
6
6
1000
1000
1000
250
178.0
178.0
178.0
178.0
178.0
8.4
8.4
8.4
8.4
8.4
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
1.4
1.4
1.4
1.4
1.4
4.0
4.0
4.0
4.0
4.0
8.0
8.0
8.0
8.0
8.0
Q3
Q3
Q3
Q3
Q3
LMP8640HVMKE-F/NOPB SOT
LMP8640HVMKE-H/NOP
B
SOT
250
LMP8640HVMKE-T/NOPB SOT
LMP8640HVMKX-F/NOPB SOT
DDC
DDC
DDC
6
6
6
250
3000
3000
178.0
178.0
178.0
8.4
8.4
8.4
3.2
3.2
3.2
3.2
3.2
3.2
1.4
1.4
1.4
4.0
4.0
4.0
8.0
8.0
8.0
Q3
Q3
Q3
LMP8640HVMKX-H/NOP
B
SOT
LMP8640HVMKX-T/NOPB SOT
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
6
6
6
6
6
6
6
6
6
3000
1000
1000
1000
250
178.0
178.0
178.0
178.0
178.0
178.0
178.0
178.0
178.0
8.4
8.4
8.4
8.4
8.4
8.4
8.4
8.4
8.4
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
LMP8640MK-F/NOPB
LMP8640MK-H/NOPB
LMP8640MK-T/NOPB
LMP8640MKE-F/NOPB
LMP8640MKE-H/NOPB
LMP8640MKE-T/NOPB
LMP8640MKX-F/NOPB
LMP8640MKX-H/NOPB
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
250
250
3000
3000
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
24-Apr-2013
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)
LMP8640MKX-T/NOPB
SOT
DDC
6
3000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
LMP8640HVMK-F/NOPB
LMP8640HVMK-H/NOPB
LMP8640HVMK-T/NOPB
LMP8640HVMKE-F/NOPB
LMP8640HVMKE-H/NOPB
LMP8640HVMKE-T/NOPB
LMP8640HVMKX-F/NOPB
LMP8640HVMKX-H/NOPB
LMP8640HVMKX-T/NOPB
LMP8640MK-F/NOPB
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
SOT
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
1000
1000
1000
250
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
210.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
185.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
35.0
250
250
3000
3000
3000
1000
1000
1000
250
LMP8640MK-H/NOPB
LMP8640MK-T/NOPB
LMP8640MKE-F/NOPB
LMP8640MKE-H/NOPB
LMP8640MKE-T/NOPB
LMP8640MKX-F/NOPB
250
250
3000
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
LMP8640MKX-T/NOPB
SOT
SOT
DDC
DDC
6
6
3000
3000
210.0
210.0
185.0
185.0
35.0
35.0
Pack Materials-Page 3
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Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
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