LMP8640HVMKE-T/NOPB - Texas Instruments High-Performance Analog

+IN -IN

V+

V-

RG = 2*RIN

VOUT

LMP8640

RIN

ADC

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

LMP8640

LMP8640HV

www.ti.com

SNOSB28F –AUGUST 2010–REVISED APRIL 2013

Precision High Voltage Current Sense Amplifier

Check for Samples: LMP8640,LMP8640HV

1FEATURES DESCRIPTION

The LMP8640 and the LMP8640HV are precision

2• Typical Values, TA= 25°C current sense amplifiers that detect small differential

• High Common-Mode Voltage Range voltages across a sense resistor in the presence of

– LMP8640: -2V to 42V high input common mode voltages with a supply

voltage range from 2.7V to 12V.

– LMP8640HV: -2V to 76V

• Supply Voltage Range: 2.7V to 12V The LMP8640 accepts input signals with common

mode voltage range from -2V to 42V, while the

• Gain Options: 20V/V; 50V/V; 100V/V LMP8640HV accepts input signal with common mode

• Max Gain Error: 0.25% voltage range from -2V to 76V. The LMP8640 and

• Low Offset Voltage: 900µV LMP8640HV have fixed gain for applications that

demand accuracy over temperature. The LMP8640

• Input Bias Current: 13 µA and LMP8640HV come out with three different fixed

• PSRR: 85 dB gains 20V/V, 50V/V, 100V/V ensuring a gain

• CMRR (2.1V to 42V): 103 dB accuracy as low as 0.25%. The output is buffered in

order to provide low output impedance. This high side

• Temperature Range: -40°C to 125°C current sense amplifier is ideal for sensing and

• 6-Pin SOT Package monitoring currents in DC or battery powered

systems, excellent AC and DC specifications over

APPLICATIONS temperature, and keeps errors in the current sense

loop to a minimum. The LMP8640 and LMP8640HV

• High-Side Current Sense are ideal choice for industrial, automotive and

• Vehicle Current Measurement consumer applications, and it is available in SOT-6

• Motor Controls package.

• Battery Monitoring

• Remote Sensing

• Power Management

Typical Application

1Please 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.

2All trademarks are the property of their respective owners.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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 (1)(2)(3)

ESD Tolerance (4) 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

Voltage at VOUT pin V-to V+

Storage Temperature Range -65°C to 150°C

Junction Temperature (5) 150°C

(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.

Product Folder Links: LMP8640 LMP8640HV

LMP8640

LMP8640HV

www.ti.com

SNOSB28F –AUGUST 2010–REVISED APRIL 2013

Operating Ratings (1)

Supply Voltage (VS= V+- V−) 2.7V to 12V

Temperature Range (2) -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.

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 Min(2) Typ(3) Max(2) Unit

-900 900

VOS Input Offset Voltage VCM = 2.1V µV

-1160 1160

TCVOS Input Offset Voltage Drift(4) (5) VCM = 2.1V 2.6 µV/°C

IBInput Bias Current (6) VCM = 2.1V 12 µA

eni Input Voltage Noise (5) f > 10 kHz 117 nV/√Hz

Fixed Gain LMP8640-T 20 V/V

LMP8640HV-T

Fixed Gain LMP8640-F 50 V/V

LMP8640HV-F

Gain AVFixed Gain LMP8640-H 100 V/V

LMP8640HV-H -0.25 0.25

Gain error VCM = 2.1V %

-0.51 0.51

Accuracy over temperature(5) −40°C to 125°C, VCM=2.1V 26.2 ppm/°C

PSRR Power Supply Rejection Ratio VCM = 2.1V, 2.7V < V+< 12V, 85 dB

LMP8640HV 2.1V < VCM < 42V 103

LMP8640 2.1V < VCM< 42V

CMRR Common Mode Rejection Ratio dB

LMP8640HV 2.1V < VCM < 76V 95

-2V <VCM < 2V, 60

Fixed Gain LMP8640-T DC VSENSE = 67.5 mV, 950

LMP8640HV-T (5) CL= 30 pF,RL= 1MΩ

Fixed Gain LMP8640-F DC VSENSE =27 mV,

BW 450 kHz

LMP8640HV-F (5) CL= 30 pF, RL= 1MΩ

Fixed Gain LMP8640-H DC VSENSE = 13.5 mV, 230

LMP8640HV-H (5) CL= 30 pF ,RL= 1MΩ

(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.

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

VCM =5V, CL= 30 pF, RL= 1MΩ,

LMP8640-T LMP8640HV-T VSENSE =100mVpp,

SR Slew Rate (7) (5) 1.4 V/µs

LMP8640-F LMP8640HV-F VSENSE =40mVpp,

LMP8640-H LMP8640HV-H VSENSE =20mVpp,

RIN Differential Mode Input Impedance(5) 5 kΩ

600

VCM = 2.1V 420 800

ISSupply Current µA

2500

VCM =−2V 2000 2750

Maximum Output Voltage VCM = 2.1V 2.65 V

LMP8640-T LMP8640HV-T 18.2

VCM = 2.1V

VOUT LMP8640-F LMP8640HV-F

Minimum Output Voltage 40 mV

VCM = 2.1V

LMP8640-H LMP8640HV-H 80

VCM = 2.1V

CLOAD Max Output Capacitance Load(5) 30 pF

(7) 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.

Parameter Test Conditions Min(2) Typ(3) Max(2) Unit

-900 900

VOS Input Offset Voltage VCM = 2.1V µV

-1160 1160

TCVOS Input Offset Voltage Drift(4) (5) VCM = 2.1V 2.6 µV/°C

IBInput Bias Current (6) VCM = 2.1V 13 µA

eni Input Voltage Noise (5) f > 10 kHz 117 nV/√Hz

Fixed Gain LMP8640-T 20 V/V

LMP8640HV-T

Fixed Gain LMP8640-F 50 V/V

LMP8640HV-F

Gain AVFixed Gain LMP8640-H 100 V/V

LMP8640HV-H -0.25 0.25

Gain error VCM = 2.1V %

-0.51 0.51

Accuracy over temperature(5) −40°C to 125°C, VCM=2.1V 26.2 ppm/°C

PSRR Power Supply Rejection Ratio VCM = 2.1V, 2.7V < V+< 12V, 85 dB

(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.

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 103

LMP8640 2.1V < VCM< 42V

CMRR Common Mode Rejection Ratio dB

LMP8640HV 2.1V < VCM < 76V 95

-2V <VCM < 2V, 60

Fixed Gain LMP8640-T DC VSENSE = 67.5 mV, 950

LMP8640HV-T (5) CL= 30 pF ,RL= 1MΩ

Fixed Gain LMP8640-F DC VSENSE =27 mV,

BW 450 kHz

LMP8640HV-F(5) CL= 30 pF ,RL= 1MΩ

Fixed Gain LMP8640-H DC VSENSE = 13.5 mV, 230

LMP8640HV-H(5) CL= 30 pF ,RL= 1MΩ

VCM =5V, CL= 30 pF, RL= 1MΩ,

LMP8640-T LMP8640HV-T VSENSE =200mVpp,

SR Slew Rate (7) (5) 1.6 V/µs

LMP8640-F LMP8640HV-F VSENSE =80mVpp,

LMP8640-H LMP8640HV-H VSENSE =40mVpp,

RIN Differential Mode Input Impedance(5) 5 kΩ

722

VCM = 2.1V 500 922

ISSupply Current µA

2500

VCM =−2V 2050 2750

Maximum Output Voltage VCM = 2.1V 4.95 V

LMP8640-T LMP8640HV-T 18.2

VCM = 2.1V

VOUT LMP8640-F LMP8640HV-F

Minimum Output Voltage 40 mV

VCM = 2.1V

LMP8640-H LMP8640HV-H 80

VCM = 2.1V

CLOAD Max Output Capacitance Load(5) 30 pF

(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

-900 900

VOS Input Offset Voltage VCM = 2.1V µV

-1160 1160

TCVOS Input Offset Voltage Drift(4) (5) VCM = 2.1V 2.6 µV/°C

IBInput Bias Current (6) VCM = 2.1V 13 µA

eni Input Voltage Noise (5) f > 10 kHz 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.

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 20 V/V

LMP8640HV-T

Fixed Gain LMP8640-F 50 V/V

LMP8640HV-F

Gain AVFixed Gain LMP8640-H 100 V/V

LMP8640HV-H -0.25 0.25

Gain error VCM = 2.1V %

-0.51 0.51

Accuracy over temperature(5) −40°C to 125°C, VCM=2.1V 26.2 ppm/°C

PSRR Power Supply Rejection Ratio VCM = 2.1V, 2.7V < V+< 12V, 85 dB

LMP8640HV 2.1V < VCM < 42V 103

LMP8640 2.1V < VCM< 42V

CMRR Common Mode Rejection Ratio dB

LMP8640HV 2.1V < VCM < 76V 95

-2V <VCM < 2V, 60

Fixed Gain LMP8640-T DC VSENSE = 67.5 mV, 950

LMP8640HV-T (5) CL= 30 pF ,RL= 1MΩ

Fixed Gain LMP8640-F DC VSENSE =27 mV,

BW 450 kHz

LMP8640HV-F (5) CL= 30 pF ,RL= 1MΩ

Fixed Gain LMP8640-H DC VSENSE = 13.5 mV, 230

LMP8640HV-H (5) CL= 30 pF ,RL= 1MΩ

VCM =5V, CL= 30 pF, RL= 1MΩ,

LMP8640-T LMP8640HV-T VSENSE =500mVpp,

SR Slew Rate (7) (5) 1.8 V/µs

LMP8640-F LMP8640HV-F VSENSE =200mVpp,

LMP8640-H LMP8640HV-H VSENSE =100mVpp,

RIN Differential Mode Input Impedance(5) 5 kΩ

1050

VCM = 2.1V 720 1250

ISSupply Current µA

2800

VCM =−2V 2300 3000

Maximum Output Voltage VCM = 2.1V 11.85 V

LMP8640-T LMP8640HV-T 18.2

VCM = 2.1V

VOUT LMP8640-F LMP8640HV-F

Minimum Output Voltage 40 mV

VCM = 2.1V

LMP8640-H LMP8640HV-H 80

VCM = 2.1V

CLOAD Max Output Capacitance Load(8) 30 pF

(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.

Product Folder Links: LMP8640 LMP8640HV

VOUT

V-

+IN -IN

V+

LMP8640

LMP8640HV

+IN -IN

V+

V-

RG = 2*RIN

VOUT

LMP8640

LMP8640HV

RIN

LMP8640

LMP8640HV

www.ti.com

SNOSB28F –AUGUST 2010–REVISED APRIL 2013

DEVICE INFORMATION

Block Diagram

Connection Diagram

Top View

Figure 1. 6-Pin SOT Package

see package number DDC0006A

Table 1. Pin Descriptions

Pin Name Description

1 VOUT Single Ended Output

2 V-Negative Supply Voltage

3 +IN Positive Input

4 -IN Negative Input

5 NC Not Connected

6 V+Positive Supply Voltage

Product Folder Links: LMP8640 LMP8640HV

VCM(V)

CMRR (dB)

140

130

120

110

100

-2 11 24 37 50 63 76

125°C

25°C

-40°C

VS= 5V

VCM(V)

CMRR (dB)

140

130

120

110

100

-2 11 24 37 50 63 76

125°C

25°C

-40°C

VS= 5V

VCM (V)

IS(PA)

2300

2100

1900

1700

1500

1300

1100

900

700

500

300

-2 -1 0 1 2 3 4 16 28 40 52 64 76

VS= 5V

125°C

25°C -40°C

VCM (V)

IS(PA)

2500

2300

2100

1900

1700

1500

1300

1100

900

700

500

-2 -1 0 1 2 3 4 16 28 40 52 64 76

VS= 12V

125°C

25°C -40°C

VS(V)

IS(PA)

2500

2400

2300

2200

2100

2000

1900

800

700

600

500

400

300

2.7 5.3 8.0 10.6 13.2

25°C 125°C-40°C

VCM = 2.1V VCM=-2V

| |

VCM (V)

IS(PA)

2300

2100

1900

1700

1500

1300

1100

900

700

500

300

-2 -1 0 1 2 3 4 16 28 40 52 64 76

25°C

VS= 2.7V

125°C

-40°C

LMP8640

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

Figure 2. Figure 3.

Supply Current vs. VCM Supply Current vs. VCM

Figure 4. Figure 5.

CMRR vs. VCM (Gain 20V/V) CMRR vs. VCM (Gain 50V/V)

Figure 6. Figure 7.

Product Folder Links: LMP8640 LMP8640HV

FREQUENCY (Hz)

GAIN (dB)

100 1k 10k 100k 1M 10M

GAIN 20V/V

GAIN 50V/V

GAIN 100V/V VS=5V, VCM=5V

100

-100

-200

-300

-400

-500

-600

-700

-800

-900-2 -1 0 1 2 3 4 16 28 40 52 64 76

VS= 12V

125°C

25°C

-40°C

VCM (V)

IB(PV)

(µA)

VCM (V)

IB(PV)

100

-100

-200

-300

-400

-500

-600

-700

-800

-900-2 -1 0 1 2 3 4 16 28 40 52 64 76

VS= 2.7V

125°C

25°C

-40°C

(µA)

100

-100

-200

-300

-400

-500

-600

-700

-800

-900-2 -1 0 1 2 3 4 16 28 40 52 64 76

VS= 5V

125°C

25°C

-40°C

VCM (V)

IB(PV)

(µA)

VCM(V)

CMRR (dB)

140

130

120

110

100

-2 11 24 37 50 63 76

125°C

25°C

-40°C

VS= 5V

VCM(V)

VOS (PV)

-2 11 24 37 50 63 76

200

150

100

-50

-100

-150

-200

125°C

-40°C

25°C

VS= 5V

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.

CMRR vs. VCM (Gain 100V/V) Input Voltage Offset vs. VCM

Figure 8. Figure 9.

Ibias vs. VCM Ibias vs. VCM

Figure 10. Figure 11.

Ibias vs. VCM Gain vs. Frequency

Figure 12. Figure 13.

Product Folder Links: LMP8640 LMP8640HV

VSENSE (10mV/DIV)

TIME (400 ns/DIV)

VOUT (100mV/DIV)

GAIN 20V/V

GAIN 50V/V

GAIN 100V/V VSENSE

VS= 5V, VCM = 12V

VSENSE (10 mV/DIV)

TIME (400 ns/DIV)

VOUT (100 mV/DIV)

GAIN 20V/V

GAIN 50V/V

GAIN 100V/V

VSENSE

VS= 5V, VCM= 12V

VSENSE (20 mV/DIV)

TIME (2 Ps/DIV)

VOUT (500 mV/DIV)

GAIN 20V/V

GAIN 50V/V

GAIN 100

VSENSE

VS=12V, VCM=12V

VSENSE(10mV/DIV)

TIME (2Ps/DIV)

VOUT (100mV/DIV)

GAIN 20V/V

GAIN 50V/V

GAIN 100V/V

VSENSE

VS= 5V, VCM= 12V

VSENSE (mV)

VOUT (V)

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

0.00 100 200 300 400 500 600

GAIN 20V/V

GAIN 50V/V

GAIN 100V/V

VS=12V, VCM=12V

VSENSE (mV)

VOUT (mV)

300

250

200

150

100

-3 -2 -1 0 1 2 3

GAIN 20V/V

GAIN 50V/V

GAIN 100V/V

VS=12V, VCM=12V

LMP8640

LMP8640HV

SNOSB28F –AUGUST 2010–REVISED APRIL 2013

www.ti.com

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)

Figure 14. Figure 15.

Large Step response Small Step response

Figure 16. Figure 17.

Settling time (fall) Settling time (rise)

Figure 18. Figure 19.

Product Folder Links: LMP8640 LMP8640HV

Frequency (Hz)

CMRR (dB)

110

101 10 100 1k 10k 100k

GAIN 100V/V

GAIN 50V/V

GAIN 20V/V

VS= 5V, VCM = 12V

FREQUENCY (Hz)

PSRR (dB)

100

10 100 1k 10k 100k 1M

GAIN 100V/V

GAIN 50V/V

GAIN 20V/V

VS= 5V, VCM = 12V

IOUT (mA)

VOUT (V)

2.505

2.504

2.503

2.502

2.501

2.500

2.499

2.4980 1 2 3 4 5 6 7 8 9 10

GAIN 50

GAIN 100V/V

GAIN 20V/V

VS=5V, VCM=12V

IOUT (mA)

VOUT (V)

2.6

2.5

2.4

2.3

2.2

2.1

2.0

1.90 1 2 3 4 5 6 7 8 9 10

GAIN 50

GAIN 100V/V

GAIN 20V/V

VS=5V, VCM=12V

VCM (5V/DIV)

TIME (4 és/DIV)

VOUT (50 mV/DIV)

VCM

VOUT

VS = 5V, GAIN 20 V/V

VCM (5V/DIV)

TIME (4 és/DIV)

VOUT (20mV/DIV)

VCM

VOUT

VS= 5V, GAIN 20 V/V

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.

Common mode step response (rise) Common mode step response (fall)

Figure 20. Figure 21.

Load regulation (Sinking) Load regulation (Sourcing)

Figure . Figure 22.

AC PSRR vs. Frequency AC CMRR vs. Frequency

Figure 23. Figure 24.

Product Folder Links: LMP8640 LMP8640HV

+IN -IN

V+

V-

RG = 2*RIN

VOUT

LMP8640

RIN

VSENSE

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 RSdevelops 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 ISaccording to the following relation:

IG= VSENSE/RIN = RS*IS/RIN , (1)

flows entirely in the internal gain resistor RGdeveloping 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.

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 RSis 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 RScan be significant so a smaller value of RSis

suggested. In this condition is required to take in account also the power rating of RSresistor. 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.

Product Folder Links: LMP8640 LMP8640HV

+IN -IN

V+

V-

RG = 2*RIN

VOUT

LMP8640

RIN

ADC

GRF

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.

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 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, 4.1mΩrespectively.

Product Folder Links: LMP8640 LMP8640HV

LMP8640

LMP8640HV

SNOSB28F –AUGUST 2010–REVISED APRIL 2013

www.ti.com

One of the project constraints requires RS<10mΩ, it means that the 20.5mΩwill 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= 4.1mΩRS= 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

Resolution (Total error / RS) 19.2mA 9.6mA

Table 3. Accuracy Calculation

ERROR SOURCE RS= 4.1mΩRS= 8.1mΩ

Tc Vos 182µV 182µV

Nosie 216µV 216µV

Gain drift 75.2µV 151µV

Total error (squared sum of contribution) 293µV 320µV

Accuracy 100*(Max_VSENSE / Total Error) 0.7% 0.4%

From the tables above is clear that the 8.2mΩshunt resistor allows the respect of the project's constraints. The

power burned on the Shunt is 820mW at 10A.

Product Folder Links: LMP8640 LMP8640HV

PACKAGE OPTION ADDENDUM

www.ti.com 15-Apr-2013

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead/Ball Finish MSL Peak Temp

(3)

Op Temp (°C) Top-Side Markings

(4)

Samples

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

PACKAGE OPTION ADDENDUM

www.ti.com 15-Apr-2013

Addendum-Page 2

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead/Ball Finish MSL Peak Temp

(3)

Op Temp (°C) Top-Side Markings

(4)

Samples

LMP8640MKX-T/NOPB 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.

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

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

BSOT 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

BSOT 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

PACKAGE MATERIALS INFORMATION

www.ti.com 24-Apr-2013

Pack Materials-Page 1

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

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 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

PACKAGE MATERIALS INFORMATION

www.ti.com 24-Apr-2013

Pack Materials-Page 2

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

PACKAGE MATERIALS INFORMATION

www.ti.com 24-Apr-2013

Pack Materials-Page 3

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other

changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest

issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and

complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale

supplied at the time of order acknowledgment.

TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms

and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary

to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily

performed.

TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and

applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide

adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or

other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information

published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or

endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the

third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration

and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered

documentation. Information of third parties may be subject to additional restrictions.

Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service

voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.

TI is not responsible or liable for any such statements.

Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements

concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support

that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which

anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause

harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use

of any TI components in safety-critical applications.

In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to

help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and

requirements. Nonetheless, such components are subject to these terms.

No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties

have executed a special agreement specifically governing such use.

Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in

military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components

which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and

regulatory requirements in connection with such use.

TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of

non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.

Products Applications

Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive

Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications

Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers

DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps

DSP dsp.ti.com Energy and Lighting www.ti.com/energy

Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial

Interface interface.ti.com Medical www.ti.com/medical

Logic logic.ti.com Security www.ti.com/security

Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense

Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video

RFID www.ti-rfid.com

OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com

Wireless Connectivity www.ti.com/wirelessconnectivity

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265