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PDF LMP8640HV Data sheet ( Hoja de datos )
| Número de pieza | LMP8640HV | |
| Descripción | Precision High Voltage Current Sense Amplifier | |
| Fabricantes | National Semiconductor | |
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LMP8640/LMP8640HV
September 7, 2010
Precision High Voltage Current Sense Amplifier
General Description
The LMP8640 and the LMP8640HV are precision current
sense amplifiers that detect small differential voltages across
a sense resistor in the presence of high input common mode
voltages with a supply voltage range from 2.7V to 12V.
The LMP8640 accepts input signals with common mode volt-
age 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 ap-
plications that demand accuracy over temperature. The
LMP8640 and LMP8640HV come out with three different
fixed gains 20V/V, 50V/V, 100V/V ensuring a gain accuracy
as low as 0.25%. The output is buffered in order to provide
low output impedance. This high side current sense amplifier
is ideal for sensing and monitoring currents in DC or battery
powered systems, excellent AC and DC specifications over
temperature, and keeps errors in the current sense loop to a
minimum. The LMP8640 and LMP8640HV are ideal choice
for industrial, automotive and consumer applications, and it is
available in TSOT-6 package.
Features
Typical values, TA = 25°C
■ High common-mode voltage range
— LMP8640
-2V to 42V
— LMP8640HV
-2V to 76V
■ Supply voltage range
2.7V to 12V
■ Gain options
20V/V; 50V/V; 100V/V
■ Max gain error
0.25%
■ Low offset voltage
900µV
■ Input bias current
13 μA
■ PSRR
85 dB
■ CMRR (2.1V to 42V)
103 dB
■ Temperature range
-40°C to 125°C
■ 6-Pin TSOT Package
Applications
■ High-side current sense
■ Vehicle current measurement
■ Motor controls
■ Battery monitoring
■ Remote sensing
■ Power management
Typical Application
LMP™ is a trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation 300714
30071462
www.national.com
Free Datasheet http://www.datasheet4u.com/
1 page  
Symbol
Parameter
Condition
Min Typ Max
(Note 6) (Note 5) (Note 6)
BW Fixed Gain LMP8640-T
LMP8640HV-T (Note 9)
DC VSENSE = 67.5 mV,
CL = 30 pF ,RL= 1MΩ
Fixed Gain LMP8640-F
LMP8640HV-F (Note 9)
DC VSENSE =27 mV,
CL = 30 pF ,RL= 1MΩ
Fixed Gain LMP8640-H
LMP8640HV-H (Note 9)
DC VSENSE = 13.5 mV,
CL = 30 pF ,RL= 1MΩ
SR Slew Rate (Note 8, Note 9)
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,
RIN Differential Mode Input Impedance
(Note 9)
950
450
230
1.8
5
IS Supply Current
VCM = 2.1V
720 1050
1250
VCM = −2V
2300
2800
3000
VOUT
CLOAD
Maximum Output Voltage
Minimum Output Voltage
Max Output Capacitance Load
(Note 9)
VCM = 2.1V
LMP8640-T LMP8640HV-T
VCM = 2.1V
LMP8640-F LMP8640HV-F
VCM = 2.1V
LMP8640-H LMP8640HV-H
VCM = 2.1V
11.85
30
18.2
40
80
Units
kHz
V/µs
kΩ
µA
V
mV
pF
Note 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.
Note 2: 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).
Note 3: 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.
Note 4: 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 guarantee 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.
Note 5: 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 guaranteed on shipped production material.
Note 6: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlations using statistical quality
control (SQC) method.
Note 7: Offset voltage temperature drift is determined by dividing the change in VOS at the temperature extremes by the total temperature change.
Note 8: The number specified is the average of rising and falling slew rates and measured at 90% to 10%.
Note 9: This parameter is guaranteed by design and/or characterization and is not tested in production.
Note 10: Positive Bias Current corresponds to current flowing into the device.
5 www.national.com
Free Datasheet http://www.datasheet4u.com/
5 Page 
AC PSRR vs. Frequency
AC CMRR vs. Frequency
30071412
30071413
11
www.national.com
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LMP8640HV.PDF ] | |
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