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LMP8640HV_15

更新时间： 2024-11-19 01:20:19
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LMP8640/-Q1/HV Precision High Voltage Current Sense Amplifiers

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LMP8640, LMP8640-Q1, LMP8640HV  
SNOSB28G –AUGUST 2010–REVISED NOVEMBER 2014  
LMP8640/-Q1/HV Precision High Voltage Current Sense Amplifiers  
1 Features  
3 Description  
The LMP8640, LMP8640-Q1 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 2.7 V to 12 V.  
1
•
•
Typical Values, TA = 25°C  
High Common-Mode Voltage Range  
–
–
–
LMP8640: -2 V to 42 V  
LMP8640-Q1: -2 V to 42 V, AEC-Q100  
LMP8640HV: -2 V to 76 V  
The LMP8640 and LMP8640-Q1 accept input signals  
with common mode voltage range from -2 V to 42 V,  
while the LMP8640HV accepts input signal with  
common mode voltage range from -2 V to 76 V. The  
LMP8640 and LMP8640HV have fixed gain for  
applications that demand accuracy over temperature.  
The LMP8640 and LMP8640HV come out with three  
different fixed gains 20 V/V, 50 V/V, 100 V/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  
•
•
•
•
•
•
•
•
•
Supply Voltage Range: 2.7 V to 12 V  
Gain Options: 20 V/V; 50 V/V; 100 V/V  
Max Gain Error: 0.25%  
Low Offset Voltage: 900 µV  
Input Bias Current: 13 µA  
PSRR: 85 dB  
CMRR (2.1V to 42V): 103 dB  
Temperature Range: -40°C to 125°C  
6-Pin Thin SOT-23 Package  
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 and  
consumer applications, while the LMP8640-Q1 is an  
AEC-Q100 grade 1 qualified version of the LMP8640  
for automotive applications. The LMP8640-x is  
available in SOT-23-6 package.  
2 Applications  
•
•
•
•
•
•
High-Side Current Sense  
Vehicle Current Measurement  
Motor Controls  
Battery Monitoring  
Remote Sensing  
Device Information(1)  
Power Management  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
LMP8640  
LMP8640-Q1  
LMP8640HV  
SOT23 (6)  
2.9 mm x 1.6 mm  
(1) For all available packages, see the orderable addendum at  
the end of the datasheet.  
Simplified Schematic  
Output Voltage vs Input Voltage  
I
S
13.0  
VS=12V, VCM=12V  
12.0  
R
+IN  
-IN  
R
S
11.0  
10.0  
9.0  
L
o
a
d
LMP8640  
R
IN  
IN  
8.0  
7.0  
-
+
+
6.0  
5.0  
4.0  
V
V
3.0  
2.0  
1.0  
0.0  
A
G
ADC  
200 300  
V
OUT  
0
100  
400  
500  
600  
R
= 2*R  
IN  
G
VSENSE (mV)  
-
V
G = 10 V/V in 20 V/V gain option  
G = 25 V/V in 50 V/V gain option  
G = 50 V/V in 100 V/V gain option  
1
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. PRODUCTION DATA.  
 
 
 
 
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