LMP8640MK-T Datasheet, PDF (1/22 Pages) Texas Instruments – Precision High Voltage Current Sense Amplifier

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LMP8640
LMP8640HV
SNOSB28F – AUGUST 2010 – REVISED APRIL 2013
Precision High Voltage Current Sense Amplifier
Check for Samples: LMP8640, LMP8640HV
FEATURES
1
•2 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
APPLICATIONS
• High-Side Current Sense
• Vehicle Current Measurement
• Motor Controls
• Battery Monitoring
• Remote Sensing
• Power Management
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.
Typical Application
I_S
+IN
R_S
-IN
R_IN
R_IN
LMP8640
L
o
a
d
+-
V⁺
R_G = 2*R_IN
V^-
V_A
G
ADC
V_OUT
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
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
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.
Copyright © 2010–2013, Texas Instruments Incorporated