TI1 LMP8481MME-H High-side current sense amplifiers with voltage output Datasheet

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LMP8480, LMP8481
SNVS829C – MARCH 1999 – REVISED SEPTEMBER 2015
LMP848x Precision 76-V High-Side Current Sense Amplifiers With Voltage Output
1 Features
3 Description
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The LMP8480 and LMP8481 are precision high-side
current sense amplifiers that amplify a small
differential voltage developed across a current sense
resistor in the presence of high input common-mode
voltages. These amplifiers are designed for
bidirectional (LMP8481) or unidirectional (LMP8480)
current applications and will accept input signals with
common-mode voltage range from 4 V to 76 V with a
bandwidth of 270 kHz. Since the operating power
supply range overlaps the input common-mode
voltage range, the LMP848x can be powered by the
same voltage that is being monitored. This benefit
eliminates the need for an intermediate supply
voltage to be routed to the point of load where the
current is being monitored, resulting in reduced
component count and board space.
1
Typical Values, TA = 25°C
Bidirectional or Unidirectional Sensing
Common Mode Voltage Range 4.0 V to 76 V
Supply Voltage Range 4.5 V to 76 V
Fixed Gains 20, 60 and 100 V/V
Gain Accuracy ±0.1%
Offset ±80 µV
Bandwidth (–3dB) 270 kHz
Quiescent Current < 100 µA
Buffered High-Current Output > 5 mA
Input Bias Current 7 µA
PSRR (DC) 122 dB
CMRR (DC) 124 dB
Temperature Range –40°C to 125°C
8-Pin VSSOP Package
2 Applications
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High-Side Current Sense
Vehicle Current Measurement
Telecommunications
Motor Controls
Laser or LED Drivers
Energy Management
Solar Panel Monitoring
Typical Application Schematic
The LMP848x family consists of fixed gains of 20, 60
and 100 for applications that demand high accuracy
over temperature. The low-input offset voltage allows
the use of smaller sense resistors without sacrificing
system error. The wide operating temperature range
of –40°C to 125°C makes the LMP848x an ideal
choice for automotive, telecommunications, industrial,
and consumer applications. The LMP8480 and
LMP8481 are pin-for-pin replacements for the
MAX4080 and MAX4081, offering improved offset
voltage, wider reference adjust range and higher
output drive capabilities. The LMP8480 and LMP8481
are available in a 8-pin VSSOP package.
Device Information(1)
PACKAGE
BODY SIZE (NOM)
LMP8480
PART NUMBER
VSSOP (8)
3.00 mm x 3.00 mm
LMP8481
VSSOP (8)
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION
DATA.
LMP8480, LMP8481
SNVS829C – MARCH 1999 – REVISED SEPTEMBER 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
8
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Device Comparison Table.....................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
3
4
7.1
7.2
7.3
7.4
7.5
7.6
4
4
4
4
5
7
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Typical Characteristics ..............................................
Detailed Description ............................................ 10
8.1 Overview ................................................................. 10
8.2 Functional Block Diagrams ..................................... 11
8.3 Feature Description................................................. 12
8.4 Device Functional Modes........................................ 17
9
Application and Implementation ........................ 18
9.1 Application Information............................................ 18
9.2 Typical Applications ................................................ 18
10 Power Supply Recommendations ..................... 21
10.1 Power Supply Decoupling ..................................... 21
11 Layout................................................................... 21
11.1 Layout Guidelines ................................................. 21
11.2 Layout Example .................................................... 21
12 Device and Documentation Support ................. 22
12.1
12.2
12.3
12.4
12.5
12.6
Device Support ....................................................
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
22
22
22
22
22
22
13 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
Changes from Revision B (December 2014) to Revision C
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Deleted WSON package option for LMP8480 and LMP8481 ............................................................................................... 1
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Deleted -F version (50x gain) for LMP8480 and LMP8481.................................................................................................... 3
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Deleted WSON package options for LMP8480 and LMP8481 ............................................................................................. 3
Changes from Revision A (August 2012) to Revision B
•
2
Page
Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1
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5 Device Comparison Table
DEVICE NAME
GAIN
POLARITY
LMP8480-T
x20
Unidirectional
LMP8480-S
x60
Unidirectional
LMP8480-H
x100
Unidirectional
LMP8481-T
x20
Bidirectional or Unidirectional
LMP8481-S
x60
Bidirectional or Unidirectional
LMP8481-H
x100
Bidirectional or Unidirectional
6 Pin Configuration and Functions
LMP8481 VSSOP PACKAGE
8 PINS
(TOP VIEW)
LMP8480 VSSOP PACKAGE
8 PINS
(TOP VIEW)
Pin Functions
PIN
NAME
NO.
RSP
1
VCC
NC
I/O
DESCRIPTION
I
Positive current sense input
2
P
Positive supply voltage
3
—
No Connection – Not internally Connected.
GND
4
P
Ground
VOUT
5
O
Output
NC or REFA
6
I
LMP8480: No Connection
LMP8481: Reference Voltage “B” Input
NC or REFB
7
I
LMP8480: No Connection
LMP8481: Reference Voltage “A” Input
RSN
8
I
Negative current sense input
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7 Specifications
7.1 Absolute Maximum Ratings (1) (2)
Over operating free-air temperature range (unless otherwise noted) (3)
Supply Voltage (VCC to GND)
RSP or RSN to GND
VOUT to GND
MIN
MAX
UNIT
–0.3
85
V
–0.3
85
V
–0.3 to the lesser of (VCC + 0.3) or +20
–0.3
Applied to both VREF Pins tied together
V
12
V
–0.3
6
V
–85
85
V
Current into output pin
–20 (4)
20
mA
Current into any other pins
–5 (4)
5
mA
Operating Temperature
–40
125
°C
Junction Temperature
-40
150
°C
Storage temperature
–65
150
°C
VREF Pins
(LMP8481 Only)
Other VREF pin tied to ground
Differential Input Voltage
(1)
(2)
(3)
(4)
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.
If Military/Aerospace specified devices are required, contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods my affect device reliability.
When the input voltage (VIN) at any pin exceeds power supplies (VIN < GND or VIN > VS ), the current at that pin must not exceed 5
mA, and the voltage (VIN) has to be within the Absolute Maximum Ratings for that pin. The 20-mA package input current rating limits
the number of pins that can safely exceed the power supplies with current flow to four pins.
7.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±2000
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
±750
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
7.3 Recommended Operating Conditions
Expected normal operating conditions over free-air temperature range (unless otherwise noted) (1)
Supply Voltage (VCC)
Common Mode Voltage
Reference Input
(LMP8481 Only)
(1)
MIN
MAX
4.5
76
UNIT
V
4.0
76
V
VREFA and VREFB tied together
–0.3 to the lesser of (VCC – 1.5) or +6
V
Single VREF pin with other VREF pin grounded
–0.3 or +12 where the average of the
two VREF pins is less than the lesser of
(VCC – 1.5) or +6
V
Exceeding the Recommended Operating Conditions for extended periods of time may effect device reliability or cause parametric shifts.
7.4 Thermal Information
LMP8480, LMP8481
THERMAL METRIC (1)
DGK
NCQ
UNIT
70
°C/W
8 PINS
RθJA
(1)
4
Junction-to-ambient thermal resistance
185
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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7.5 Electrical Characteristics
Unless otherwise specified, all limits specified for at TA = 25°C, VCC = 4.5 V to 76 V, 4.5V VCM 76 V, RL = 100 k, VSENSE =
(VRSP – VRSN) = 0 V. (1)
PARAMETER
VOS
Input Offset Voltage (RTI)
TCVOS
Input Offset Voltage Drift (4)
Input Bias Current
TEST CONDITIONS
VCC = VRSP = 48
V,
ΔV = 100 mV
MIN (2)
TA = 25°C
TYP (3)
MAX (2)
±80
±265
–40°C ≤ TA ≤ 125°C
±900
±6
(5)
VCC = VRSP = 76 V, Per Input
IB
Input Leakage Current
VSENSE(MA
X)
2
-T Version, –40°C ≤ TA ≤
125°C
667
-F Version, –40°C ≤ TA ≤
125°C
267
-S Version, –40°C ≤ TA ≤
125°C
222
-H Version, –40°C ≤ TA ≤
125°C
133
20
-T Version, –40°C ≤ TA ≤ 125°C
19.8
-S Version
Gain
59.5
-H Version
99.2
DC Power Supply Rejection Ratio
±0.6%
–40°C ≤ TA ≤ 125°C
±0.8%
VRSP = 48 V, VCC = 4.5 to 76 V, –40°C ≤ TA
≤ 125°C
122
V = 48 V, VRSP = 4.5 to 76 V, –40°C ≤ TA
DC CMRR DC Common Mode Rejection Ratio CC
≤ 125°C
dB
100
VCC = 48 V, VRSP = 4.5 to 76 V
124
dB
100
VCC = 48 V, VRSP = 4 to 76 V
124
CMVR
Input Common Mode Voltage
Range
CMRR > 100 dB, –40°C ≤ TA ≤ 125°C
ROUT
Output Resistance / Load
Regulation
VSENSE = 100 mV
0.1
VOMAX
Maximum Output Voltage
(Headroom)
(VOMAX = VCC – VOUT)
VCC = 4.5 V, VRSP = 48 V, VSENSE = +1 V,
IOUT (sourcing) 500 μA
230
(1)
(2)
(3)
(4)
(5)
(6)
V/V
100.8
TA = 25°C
VRSP = 48 V, VCC = 4.5 to 76 V
DC PSRR
60.5
100
-H Version, –40°C ≤ TA ≤ 125°C
VCC = VRSP = 48
V
20.2
60
-S Version, –40°C ≤ TA ≤ 125°C
Gain Error
μA
mV
-T Version
AV
μA
0.01
VCC = 0, VRSP = 86 V, Both inputs together,
–40°C ≤ TA ≤ 125°C
VCC = 16
µV°C
12
VCC = 0, VRSP = 86 V, Both inputs together
Differential Input Voltage Across
Sense Resistor (6)
µV
6.3
VCC = VRSP = 76 V, Per Input, –40°C ≤ TA ≤
125°C
ILEAK
UNIT
4
dB
76
V
500
mV
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.
All limits are specified by testing, design, or statistical analysis.
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.
Positive Bias Current corresponds to current flowing into the device.
This parameter is specified by design and/or characterization and is not tested in production.
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Electrical Characteristics (continued)
Unless otherwise specified, all limits specified for at TA = 25°C, VCC = 4.5 V to 76 V, 4.5V VCM 76 V, RL = 100 k, VSENSE =
(VRSP – VRSN) = 0 V.(1)
PARAMETER
MIN (2)
TEST CONDITIONS
VCC = VRSP = 48 V, VSENSE = –1 V,
IOUT (sinking) = 10 µA
TYP (3)
Minimum Output Voltage
15
VCC = VRSP = 4.5 V, VSENSE = –1 V,
IOUT (sinking) = 10 µA
3
VCC = VRSP = 48 V, VSENSE = –1 V,
IOUT (sinking) = 100 µA
18
mV
VCC = VRSP = 48 V, VSENSE = –1 V,
IOUT (sinking) = 100 µA, –40°C ≤ TA ≤ 125°C
18
12
Output voltage with load
VCC = 28 V, VRSP=28 V, VSENSE= 600 mV,
I OUT (sourcing) = 500 µA
VOLREG
Output Load Regulation
VCC = 20, VRSP = 16, VOUT = 12,
ΔIL = 200 na to 8 mA
ICC
Supply Current
VOUT = 2 V, RL = 10 M, VCC = VRSP = 76 V,
–40°C ≤ TA ≤ 125°C
BW
–3 dB Bandwidth
RL = 10 M, CL = 20 pF
SR
Slew rate (7)
VSENSE from 10 mV to 80 mV, RL = 10 M,
CL = 20 pF
eni
Input Referred Voltage Noise
f = 1 kHz
tSETTLE
Output Settling Time to 1% of Final VSENSE = 10 mV to 100 mV and 100 mV to
Value
10 mV
tPU
Power-up Time
tRECOVERY
CLOAD
V
0.001%
VOUT = 2 V, RL = 10 M, VCC = VRSP = 76 V
6
55
VCC = VRSP = 4.5 V, VSENSE = –1 V,
IOUT (sinking) = 100 µA
VOLOAD
(7)
UNIT
3
VCC = VRSP = 48 V, VSENSE = –1 V,
IOUT (sinking) = 10 µA, –40°C ≤ TA ≤ 125°C
VOMIN
MAX (2)
88
155
µA
270
kHz
1
V/µs
95
nV/√Hz
20
µs
VCC = VRSP = 48 V, VSENSE = 100 mV,
output to 1% of final value
50
µs
Saturation Recovery Time
Output settles to 1% of final value, the device
will not experience phase reversal when
overdriven.
50
µs
Max Output Capacitance Load
No sustained oscillations
500
pF
The number specified is the average of rising and falling slew rates and measured at 90% to 10%.
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7.6 Typical Characteristics
Unless otherwise specified, TA = 25°C, VCC = 4.5 V to 76 V, 4.5 V < VCM < 76 V, RL = 100k, VSENSE = (VRSP – VRSN ) = 0 V, for
all gain options.
Figure 1. Offset Voltage Histogram
Figure 2. Typical Offset Voltage vs Temperature
Figure 3. Typical Gain Accuracy vs Temperature
Figure 4. Typical Gain Accuracy vs Supply Voltage
Figure 5. Typical Offset Voltage vs Supply Voltage
Figure 6. AC Common-Mode Rejection Ratio vs Frequency
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Typical Characteristics (continued)
Unless otherwise specified, TA = 25°C, VCC = 4.5 V to 76 V, 4.5 V < VCM < 76 V, RL = 100k, VSENSE = (VRSP – VRSN ) = 0 V, for
all gain options.
8
Figure 7. AC Power Supply Rejection Ratio vs Frequency
Figure 8. Small Signal Gain vs Frequency
Figure 9. Large Signal Pulse Response
Figure 10. Small Signal Pulse Response
Figure 11. Supply Current vs Supply Voltage
Figure 12. Supply Current vs Temperature
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Typical Characteristics (continued)
Unless otherwise specified, TA = 25°C, VCC = 4.5 V to 76 V, 4.5 V < VCM < 76 V, RL = 100k, VSENSE = (VRSP – VRSN ) = 0 V, for
all gain options.
Figure 13. Saturated Output Sourcing Current at 4.5 V
Figure 14. Saturated Output Sinking Current at 4.5 V
Figure 15. Saturated Output Sourcing Current at 12 V
Figure 16. Saturated Output Current Sinking at 12 V
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8 Detailed Description
8.1 Overview
The LMP8480 and LMP8481 are single-supply, high-side current sense amplifiers with available fixed gains of
x20, x60 and x100. The power supply range is 4.5 V to 76 V, while the common-mode input voltage range is
capable of 4.0-V to 76-V operation. The supply voltage and common-mode range are completely independent of
each other. This makes the LMP848x supply voltage extremely flexible, as the LMP848x's supply voltage can be
greater than, equal to, or less than the load source voltage, and allowing the device to be powered from the
system supply or the load supply voltage.
The LMP8480 and LMP8481 supply voltage does not have to be larger than the load source voltage. A 76-V load
source voltage with a 5-V supply voltage is perfectly acceptable.
8.1.1 Theory of Operation
The LMP8480 and LMP8481 are comprised of two main stages. The first stage is a differential input current to
voltage converter, followed by a differential voltage amplifier and level-shifting output stage. Also present is an
internal 14 Volt Low-Dropout Regulator (LDO) to power the amplifiers and output stage, as well as a reference
divider resistor string to allow the setting of the reference level.
As seen in Figure 18, the current flowing through RSENSE develops a voltage drop called VSENSE. The voltage
across the sense resistor, VSENSE, is then applied to the input RSP and RSN pins of the amplifier.
Internally, the voltage on each input pin is converted to a current by the internal precision thin-film input resistors
RGP and RGN. A second set of much higher value VCM sense resistors between the inputs provide a sample of
the input common-mode voltage for internal use by the differential amplifier.
VSENSE is applied to the differential amplifier through RGP and RGN. These resistors change the input voltage to a
differential current. The differential amplifier then servos the resistor currents through the MOSFETs to maintain
a zero balance across the differential amplifier inputs.
With no input signal present, the currents in RGP and RGN are equal. When a signal is applied to VSENSE, the
current through RGP and RGN are imbalanced and are no longer equal. The amplifier then servos the MOSFETS
to correct this current imbalance, and the extra current required to balance the input currents is then reflected
down into the two lower 400-kΩ “tail” resistors. The difference in the currents into the tail resistors is therefore
proportional to the amplitude and polarity of VSENSE. The tail resistors, being larger than the input resistors for the
same current, then provide voltage gain by changing the current into a proportionally larger voltage. The gain of
the first stage is then set by the tail resistor value divided by RG value.
The differential amplifier stage then samples the voltage difference across the two 400-kΩ tail resistors and also
applies a further gain-of-five and output level-shifting according to the applied reference voltage (VREF).
The resulting output of the amplifier will be equal to the differential input voltage times the gain of the device, plus
any voltage value applied to the two VREF pins.
The resistor values in the schematic are ideal values for clarity and understanding. Table 1 shows the actual
values used that account for parallel combinations and loading. This table can be used for calculating the effects
of any additional external resistance.
The LMP8480 is identical to the LMP8481, except that both the VREF pins are grounded internally.
Table 1. Actual Internal Resistor Values
Gain Option
10
RGP and RGN
(each)
RVCMSENSE
(each)
RTAIL
(each)
Differential Amp FB
(each)
VREFx Resistors
(each)
20x
98.38 k
491.9 k
393.52 k
1967.6 k
98.38 k
60x
32.793 k
172.165 k
393.52 k
1967.6 k
98.38 k
100x
19.676 k
98.38 k
393.52 k
1967.6 k
98.38 k
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8.2 Functional Block Diagrams
RSN
RSP
LMP8480
VSENSE
VCM
SENSE
RGP
VCC
Difference
Amplifier
(x5)
Internal
14V LDO
Regulator
RGN
2 M:
-
+
+
VOUT
100 k:
V to I
Converter
1.95 M:
100 k:
400 k:
400 k:
GND
Figure 17. LMP8480 Block Diagram
RSN
RSP
LMP8481
VSENSE
RGP
VCC
Internal
14V LDO
Regulator
VCM
SENSE
+
Difference
Amplifier
(x5)
RGN
2 M:
-
+
VOUT
100 k:
V to I
Converter
VREFA
1.95 M:
100 k:
400 k:
400 k:
VREFB
GND
Figure 18. LMP8481 Block Diagram
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8.3 Feature Description
8.3.1 Basic Connections
Figure 19 through Figure 22 show the basic connections for seveal different configurations.
+4.0V
to
+76V
ISENSE
VCC = +4.5V to +76V
To Load
RSENSE
CBYPASS
0.1PF
VCC
RSN
VSENSE
OUTPUT
LMP8480 VOUT
RSP
GND
Figure 19. LMP8480 Basic Connections (Unidirectional)
Figure 19 shows the basic connections for the LMP8480 for Unidirectional applications. The output will be at zero
with zero sense voltage.
+4.0V
to
+76V
ISENSE
VCC = +4.5V to +76V
To Load
RSENSE
CBYPASS
0.1PF
VCC
RSN
VSENSE
OUTPUT
LMP8481 VOUT
REFA
RSP
REFB
GND
VREF INPUT
Figure 20. LMP8481 Basic Connections for External 1:1 VREF Input (Bidirectional)
Figure 20 shows the basic connections for the LMP8481 for Bidirectional applications using an external reference
input. At zero input voltage, the output will be at the applied reference voltage (VREF), moving positive or negative
from the zero reference point.
+4.0V
to
+76V
ISENSE
VCC = +4.5V to +76V
To Load
RSENSE
CBYPASS
0.1PF
VCC
RSN
VSENSE
OUTPUT
LMP8481 VOUT
REFA
RSP
REFB
GND
VREF
or
VCC
Figure 21. LMP8481 Basic Connections for Mid-Bias (VREF/2) Input (Bidirectional)
12
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Feature Description (continued)
Figure 21 shows the basic connections for the LMP8481 for Bidirectional applications centering the output at
one-half the applied VREF or VCC voltage. If VREFA is connected to VCC, then the output "zero" point will be VCC/2.
If VREFA is connected to the ADC VREF line, then the "zero" output will be at mid-scale for the ADC.
ISENSE
+4.0V
to
+76V
VCC = +4.5V to +76V
To Load
RSENSE
CBYPASS
0.1PF
VCC
RSN
VSENSE
LMP8481 VOUT
OUTPUT
REFA
RSP
REFB
GND
Figure 22. LMP8481 Connections for Unidirectional Configuration (Equivalent to LMP8480 Unidirectional)
Figure 22 shows the how to connect the LMP8481 for Bidirectional applications, thus making it equivalent to the
LMP8480 in Figure 19.
8.3.2 Selection of the Sense Resistor
The accuracy of the current measurement depends heavily on the accuracy of the shunt resistor RSENSE. Its
value depends on the application and is a compromise between small-signal accuracy, maximum permissible
voltage drop and allowable power dissipation in the current measurement circuit.
The use of a “4-terminal” or “Kelvin” sense resistor is highly recommended. See the Layout Guidelines.
For best results, the value of the resistor is calculated from the maximum expected load current ILMAX and the
expected maximum output swing VOUTMAX, plus a few percent of headroom. See the Maximum Output Voltage
section for details about the maximum output voltage limits.
High values of RSENSE provide better accuracy at lower currents by minimizing the effects of amplifier offset. Low
values of RSENSE minimize load voltage loss, but at the expense of accuracy at low currents. A compromise
between low current accuracy and load circuit losses must generally be made.
The maximum VSENSE voltage that must be generated across the RSENSE resistor will be:
VSENSE = VOUTMAX / AV
(1)
NOTE
The maximum VSENSE voltage should be no more than 667 mV.
From this maximum VSENSE voltage, the RSENSE value can be calculated from:
RSENSE = VSENSE / ILMAX
(2)
Take care not exceed the maximum power dissipation of the resistor. The maximum sense resistor power
dissipation will be:
PRSENSE = VSENSE × ILMAX
(3)
TI recommends using a 2-3x minimum safety margin in selecting the power rating of the resistor.
8.3.3 Using PCB Traces as Sense Resistors
While it may be tempting to use a known length of PCB trace resistance as a sense resistor, it is not
recommended.
The temperature coefficient of copper is typically 3300-4000 ppm/°K, which can vary over PCB process
variations and require measurement correction (possibly requiring ambient temperature measurements).
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Feature Description (continued)
A typical surface mount sense resistor tempco is in the 50 ppm to 500 ppm/°C range offering more measurement
consistency and accuracy over the copper trace. Special low-tempco resistors are available in the 0.1 to 50 ppm
range, but at a higher cost.
8.3.4 VREFA and VREFB Pins (LMP8481 Only)
The voltage applied to the VREFA and VREFB pins controls the output zero reference level. Depending on how the
pins are configured, the output reference level can be set to GND, or VCC/2, or external VREF/2, or the average of
two different input references.
The reference inputs consist of a pair of divider resistors with equal values to a common summing point, VREF' as
shown in Figure 23. Assuming VSENSE is zero, the output will be at the same value as VREF'.
Figure 23. VREF Input Resistor Network
VREF' is the voltage at the resistor tap-point that will be directly applied to the output as an offset. With the two
VREF inputs tied together, the output zero voltage will have a 1:1 ratio relationship with VREF.
VOUT = ( (VRSP – VRSN) ×Av ) + VREF’
(4)
Where:
VREF’ = VREFA = VREFB (Equal Inputs)
(5)
VREF’ = ( VREFA + VREFB ) / 2 (Different Inputs)
(6)
or:
8.3.4.1 One-to-One (1:1) Reference Input
To directly set the reference level, the two inputs are connected to the external reference voltage. The applied
VREF will be reflected 1:1 on the output.
Figure 24. Applying 1:1 Direct Reference Voltage
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Feature Description (continued)
8.3.4.2 Setting Output to One-Half VCC or external VREF
For mid-range operation VREFB should be tied to ground and VREFA can be tied to VCC or an external A/D
reference voltage. The output will be set to one-half the reference voltage. For example, a 5-V reference would
result in a 2.5-V output “zero” reference.
Figure 25. Applying a Divided Reference Voltage
VREF’ = (VREFA – VREFB) / 2
(7)
When the reference pins are biased at different voltages, the output will be referenced to the average of the two
applied voltages.
The reference pins should always be driven from clean, stable sources, such as A/D reference lines or clean
supply lines. Any noise or drifts on the reference inputs are directly reflected in the output. Take care if the power
supply is used as the reference source so as to not introduce supply noise, drift or sags into the measurement.
It is possible to set different resistor divider ratios by adding external resistors in series with the internal 100-K
resistors, though the temperature coefficient (tempco) of the external resistors may not tightly track the internal
resistors and there will be slight errors over temperature.
The LMP8480 is identical to the LMP8481, except that both the VREF pins are grounded internally. The LMP8481
can replace the LMP8480 if both VREF pins are grounded.
8.3.5 Reference Input Voltage Limits (LMP8481 Only)
The maximum voltage on either reference input pin is limited to VCC or 12 V, whichever is less.
The average voltage on the two VREF pins, and thus the actual output reference voltage level, is limited to a
maximum of 1.5 V below VCC, or 6 V, whichever is less. Beware that supply voltages of less than 7.5 V will have
a diminishing VREF maximum.
Both VREFA and VREFB may both be grounded to provide a ground referenced output (thus functionally duplicating
the LMP8480).
It should be noted that there can be a dynamic error in the VREF to output level matching of up to 100 µV/V.
Normally this is not an issue for fixed references, but if the reference voltage is dynamically adjusted during
operation, this error needs to be taken into account during calibration routines. This error will vary in both
amplitude and polarity part-to-part, but the slope will generally be linear.
8.3.6 Low-Side Current Sensing
The LMP8480 and LMP8481 are not recommended for low-side current sensing at ground level. The voltage on
either input pin must be a minimum of 4.0 V above the ground pin for proper operation. The output level may not
be valid for common-mode voltages below 4 V. This should be taken into consideration for monitoring or
feedback applications where the load-supply voltage may dip below 4 V or be switched completely off.
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Feature Description (continued)
8.3.7 Input Series Resistance
Because the input stage uses precision resistors to convert the voltage on the input pin to a current, any
resistance added in series with the input pins will change the gain. If a resistance is added in series with an
input, the gain of that input will not track that of the other input, causing a constant gain error.
TI does not recommend using external resistances to alter the gain, as external resistors will not have the same
thermal matching as the internal thin film resistors.
If resistors are purposely added for filtering, resistance should be added equally to both inputs and the user
should be aware that the gain will change slightly. See the end of the Theory of Operation section for the internal
resistor values. External resistances should be kept below 10 ohms.
8.3.8 Minimum Output Voltage
The amplifier output cannot swing to exactly 0 V. There will always be a minimum output voltage set by the
output transistor saturation and input offset errors. This will create a minimum output swing around the zero
current reading due to the output saturation. The user should be aware of this when designing any servo loops or
data acquisition systems that may assume 0 V = 0 A. If a true zero is required, the LMP8481 should be used
with a VREF set slightly above ground (> 50 mV). See the Swinging Output Below Ground section for a possible
solution to this issue.
8.3.9 Swinging Output Below Ground
If a negative supply is available, a pulldown resistor can be added from the output to the negative voltage to
allow the output to swing a few millivolts below ground. This will now allow the ADC to resolve true zero and
recover codes that would normally be lost to the negative output saturation limit.
Figure 26. Output Pulldown Resistor Example
A minimum of 50 µA should be sourced (“pulled”) from the output to a negative voltage. The pulldown resistor
can be calculated from:
RPD = –VS/50 µA
(8)
For example, if a –5-V supply is available, a pulldown resistor of 5 V/50 µA = 100 kΩ should be used. This will
allow the output to swing to about 10 mV below ground.
This technique may also reduce the maximum positive swing voltage. Do not forget to include the parallel loading
effects of the pulldown any output load. TI recommends not to exceed –100 mV on the output. Source currents
greater than 100 µA should be avoided to prevent self-heating at high-supply voltages. Pulldown resistor values
should not be so low as to heavily load the output during positive output excursions. This mode of operation is
not directly specified and is not ensured.
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Feature Description (continued)
8.3.10 Maximum Output Voltage
The LMP8481 has an internal precision 14-V low-dropout regulator which limits the maximum amplifier output
swing to about 250 mV below VCC or 13.7 V (whichever is less). This effectively clamps the maximum output to
slightly less than 13.7 V even with a VCC greater than 14 V. See Typical Application With Resistive Divider for
more information.
8.4 Device Functional Modes
8.4.1 Unidirectional vs Bidirectional Operation
Unidirectional operation is where the load current only flows in one direction (VSENSE is always positive).
Application examples would be PA monitoring, non-inductive load monitoring and laser or LED drivers. This
allows the output zero reference to be true zero volts on the output. The LMP8480 is designed for unidirectional
applications where the setting of VREF is not required. See the Unidirectional Application With LMP8480 for
more details.
Bidirectional operation is where the load current can flow in both directions (VSENSE can be positive or negative).
Application examples would be battery-charging or regenerative motor monitoring. The LMP8481 is designed for
bidirectional applications and has a pair of VREF pins to allow the setting of the output zero reference level
(VREF). See the Unidirectional Application With LMP8480 section for more details.
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The LMP848x amplifies the voltage developed across a current-sensing resistor when current passes through it.
Flexible offset inputs allow adjusting the functionality of the output for multiple configurations, as discussed
throughout this section.
9.1.1 Input Common-Mode and Differential Voltage Range
The input common-mode range, where “common-mode range” is defined as the voltage from ground to the
voltage on RSP input, should be in the range of 4.0 V to 76 V. Operation below 4.0 V on either input pin will
introduce severe gain error and nonlinearities.
The maximum differential voltage (defined as the voltage difference between RSP and RSN) should be 667 mV or
less. The theoretical maximum input is 700 mV (14 V / 20).
Taking the inputs below 4 V will not damage the device, but the output conditions during this time are not
predictable and are not ensured.
If the load voltage (Vcm) is expected to fall below 4 V as part of normal operation, preparations must be made for
invalid output levels during this time.
9.2 Typical Applications
9.2.1 Unidirectional Application With LMP8480
Figure 27. Unidirectional Application with LMP8480
9.2.1.1 Design Requirements
The LMP8480 is designed for unidirectional current sense applications. The output of the amplifier will be equal
to the differential input voltage times the fixed device gain.
9.2.1.2 Detailed Design Procedure
The output voltage can be calculated from:
VOUT = ( (VRSP – VRSN) × Av )
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Typical Applications (continued)
It should be noted that the minimum “zero” reading will be limited by the lower output swing and input offset. The
LMP8480 is functionally identical to the LMP8481, but with the VREFA and VREFB nodes grounded internally. The
LMP8481 can replace the LMP8480 if both the VREF inputs (pins 6 and 7) are grounded.
9.2.1.3 Application Curve
Figure 28. Unidirectional Transfer Function for Gain-of-20 Option
9.2.2 Bidirectional Current Sensing Using LMP8481
Figure 29. Bidirectional Current Sensing Using LMP8481
9.2.2.1 Design Requirements
Bidirectional operation is required where the measured load current can be positive or negative. Because VSENSE
can be positive or negative, and the output cannot swing negative, the “zero” output level must be level-shifted
above ground to a known zero reference point. The LMP8481 allows for the setting this reference point.
9.2.2.2 Detailed Design Procedure
The VREFA and VREFB pins set the zero reference point. The output “zero” reference point is set by applying a
voltage to the REFA and/or REFB pins. See the Unidirectional Application With LMP8480 section. VREFA and
VREFB Pins (LMP8481 Only) shows the output transfer function with a 1.2-V reference applied to the Gain-of-20
option.
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Typical Applications (continued)
9.2.2.3 Application Curve
Figure 30. Bidirectional Transfer Function Using 1.2-V Reference Voltage
9.2.3 Typical Application With Resistive Divider
Take care if the output is driving an A/D input with a maximum A/D maximum input voltage lower than the
amplifier supply voltage, as the output can swing higher than the planned load maximum due to input transients
or shorts on the load and overload or possibly damage the A/D input.
A resistive attenuator, as shown in Figure 31, can be used to match the maximum swing to the input range of the
A/D.
Figure 31. Typical Application With Resistive Divider Example
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10 Power Supply Recommendations
10.1 Power Supply Decoupling
In order to decouple the LMP848x from AC noise on the power supply, TI recommends using a 0.1-μF bypass
capacitor between the VCC and GND pins. This capacitor should be placed as close as possible to the supply
pins. In some cases, an additional 10-μF bypass capacitor may further reduce the supply noise.
Do not forget that these bypass capacitors must be rated for the full supply and / or load source voltage. TI
recommends that the working voltage of the capacitor (WVDC) should be at least two times the maximum
expected circuit voltage.
11 Layout
11.1 Layout Guidelines
The traces leading to and from the sense resistor can be significant error sources. With small value sense
resistors (< 100 mΩ), any trace resistance shared with the load current can cause significant errors.
The amplifier inputs should be directly connected to the sense resistor pads using “Kelvin” or “4-wire” connection
techniques. The traces should be one continuous piece of copper from the sense resistor pad to the amplifier
input pin pad, and ideally on the same copper layer with minimal vias or connectors. This can be important
around the sense resistor if it is generating any significant heat gradients.
To minimize noise pickup and thermal errors, the input traces should be treated as a differential signal pair and
routed tightly together with a direct path to the input pins. The input traces should be run away from noise
sources, such as digital lines, switching supplies or motor drive lines. Remember that these traces can contain
high voltage, and should have the appropriate trace routing clearances.
Since the sense traces only carry the amplifier bias current (about 7 µA at room temperature), the connecting
input traces can be thinner, signal level traces. Excessive Resistance in the trace should also be avoided.
The paths of the traces should be identical, including connectors and vias, so that these errors will be equal and
cancel.
The sense resistor will heat up as the load increases. As the resistor heats up, the resistance generally goes up,
which will cause a change in the readings The sense resistor should have as much heatsinking as possible to
remove this heat through the use of heatsinks or large copper areas coupled to the resistor pads. A reading
drifting over time after turn-on can usually be traced back to sense resistor heating.
11.2 Layout Example
Figure 32. “Kelvin” or “4–wire” Connection to the Sense Resistor
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12 Device and Documentation Support
12.1 Device Support
12.1.1 Development Support
LMP8480/1 PSPICE Model, SNVM046
LMP8480/1 TINA Reference Design, SNVM048
TINA-TI SPICE-Based Analog Simulation Program, http://www.ti.com/tool/tina-ti
LMP8480/1 Evaluation Boards, product pages
LMP8480/1 Evaluation Board Manual, SNOU031
12.2 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 2. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
LMP8480
Click here
Click here
Click here
Click here
Click here
LMP8481
Click here
Click here
Click here
Click here
Click here
12.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.4 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.5 Electrostatic Discharge Caution
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.
12.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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23-Sep-2015
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
LMP8480MM-T/NOPB
ACTIVE
VSSOP
DGK
8
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AV8A
LMP8480MME-S/NOPB
ACTIVE
VSSOP
DGK
8
250
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AY8A
LMP8480MME-T/NOPB
ACTIVE
VSSOP
DGK
8
250
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AV8A
LMP8480MMX-S/NOPB
ACTIVE
VSSOP
DGK
8
3500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AY8A
LMP8480MMX-T/NOPB
ACTIVE
VSSOP
DGK
8
3500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AV8A
LMP8481MM-H/NOPB
ACTIVE
VSSOP
DGK
8
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AH9A
LMP8481MM-S/NOPB
ACTIVE
VSSOP
DGK
8
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AA9A
LMP8481MM-T/NOPB
ACTIVE
VSSOP
DGK
8
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AT9A
LMP8481MME-H/NOPB
ACTIVE
VSSOP
DGK
8
250
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AH9A
LMP8481MME-S/NOPB
ACTIVE
VSSOP
DGK
8
250
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AA9A
LMP8481MME-T/NOPB
ACTIVE
VSSOP
DGK
8
250
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AT9A
LMP8481MMX-H/NOPB
ACTIVE
VSSOP
DGK
8
3500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AH9A
LMP8481MMX-S/NOPB
ACTIVE
VSSOP
DGK
8
3500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AA9A
LMP8481MMX-T/NOPB
ACTIVE
VSSOP
DGK
8
3500
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
AT9A
(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.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
23-Sep-2015
(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)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device 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 Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
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
23-Sep-2015
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
LMP8480MM-T/NOPB
VSSOP
DGK
8
1000
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8480MME-S/NOPB
VSSOP
DGK
8
250
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8480MME-T/NOPB
VSSOP
DGK
8
250
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8480MMX-S/NOPB
VSSOP
DGK
8
3500
330.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8480MMX-T/NOPB
VSSOP
DGK
8
3500
330.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MM-H/NOPB
VSSOP
DGK
8
1000
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MM-S/NOPB
VSSOP
DGK
8
1000
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MM-T/NOPB
VSSOP
DGK
8
1000
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MME-H/NOPB
VSSOP
DGK
8
250
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MME-S/NOPB
VSSOP
DGK
8
250
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MME-T/NOPB
VSSOP
DGK
8
250
178.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MMX-H/NOPB
VSSOP
DGK
8
3500
330.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MMX-S/NOPB
VSSOP
DGK
8
3500
330.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
LMP8481MMX-T/NOPB
VSSOP
DGK
8
3500
330.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Sep-2015
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
LMP8480MM-T/NOPB
VSSOP
DGK
8
1000
210.0
185.0
35.0
LMP8480MME-S/NOPB
VSSOP
DGK
8
250
210.0
185.0
35.0
LMP8480MME-T/NOPB
VSSOP
DGK
8
250
210.0
185.0
35.0
LMP8480MMX-S/NOPB
VSSOP
DGK
8
3500
367.0
367.0
35.0
LMP8480MMX-T/NOPB
VSSOP
DGK
8
3500
367.0
367.0
35.0
LMP8481MM-H/NOPB
VSSOP
DGK
8
1000
210.0
185.0
35.0
LMP8481MM-S/NOPB
VSSOP
DGK
8
1000
210.0
185.0
35.0
LMP8481MM-T/NOPB
VSSOP
DGK
8
1000
210.0
185.0
35.0
LMP8481MME-H/NOPB
VSSOP
DGK
8
250
210.0
185.0
35.0
LMP8481MME-S/NOPB
VSSOP
DGK
8
250
210.0
185.0
35.0
LMP8481MME-T/NOPB
VSSOP
DGK
8
250
210.0
185.0
35.0
LMP8481MMX-H/NOPB
VSSOP
DGK
8
3500
367.0
367.0
35.0
LMP8481MMX-S/NOPB
VSSOP
DGK
8
3500
367.0
367.0
35.0
LMP8481MMX-T/NOPB
VSSOP
DGK
8
3500
367.0
367.0
35.0
Pack Materials-Page 2
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