Datasheet

+IN
-IN
V
+
R
S
V
-
R
G
= 2*R
IN
V
OUT
LMP8640
R
IN
R
IN
I
S
-+
+
-
L
o
a
d
ADC
-+
V
A
G
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
1
FEATURES
DESCRIPTION
The LMP8640 and the LMP8640HV are precision
2
• Typical Values, T
A
= 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
1
Please 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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2010–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.