LMP8640HV_15 Datasheet, PDF (1/32 Pages) Texas Instruments – 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
•1 Typical Values, T_A = 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
• 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
2 Applications
• High-Side Current Sense
• Vehicle Current Measurement
• Motor Controls
• Battery Monitoring
• Remote Sensing
• Power Management
Simplified Schematic
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
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.
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
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE BODY SIZE (NOM)
LMP8640
LMP8640-Q1
SOT23 (6) 2.9 mm x 1.6 mm
LMP8640HV
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Output Voltage vs Input Voltage
13.0
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0
VS=12V, VCM =12V
GAIN 100V/V
GAIN 50V/V
GAIN 20V/V
100 200 300 400 500 600
VSENSE (mV)
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.