SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
Precision High Voltage Current Sense Amplifier
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FEATURES
Typical Values, T
A
= 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 SOT Package
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 voltage range from -2V to 42V, while the
LMP8640HV accepts input signal with common mode
voltage range from -2V to 76V. The LMP8640 and
LMP8640HV have fixed gain for applications that
demand accuracy over temperature. The LMP8640
and LMP8640HV come out with three different fixed
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 SOT-6
package.
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APPLICATIONS
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High-Side Current Sense
Vehicle Current Measurement
Motor Controls
Battery Monitoring
Remote Sensing
Power Management
Typical Application
I
S
+IN
R
IN
R
S
-IN
R
IN
LMP8640
L
o
a
d
+
+
-
+
-
V
+
-
V
A
G
V
OUT
R
G
= 2*R
IN
V
-
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
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright © 2010–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TI [ TEXAS INSTRUMENTS ]
