LMP8602, LMP8602Q, LMP8603, LMP8603Q
www.ti.com
SNOSB36D –JULY 2009–REVISED MARCH 2013
60V Common Mode, Fixed Gain, Bidirectional Precision Current Sensing Amplifier
Check for Samples: LMP8602, LMP8602Q, LMP8603, LMP8603Q
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FEATURES
DESCRIPTION
The LMP8602 and LMP8603 are fixed gain precision
amplifiers. The parts will amplify and filter small
differential signals in the presence of high common
mode voltages. The input common mode voltage
range is –22V to +60V when operating from a single
5V supply. With a 3.3V supply, the input common
mode voltage range is from –4V to +27V. The
LMP8602 and LMP8603 are members of the Linear
Monolithic Precision (LMP®) family and are ideal
parts for unidirectional and bidirectional current
sensing applications. All parameter values of the
parts that are shown in the tables are 100% tested
and all bold values are also 100% tested over
temperature.
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•
Unless Otherwise Noted, Typical Values at TA
= 25°C, VS = 5.0V, Gain = 50x (LMP8602), Gain
= 100x (LMP8603)
•
•
•
•
•
•
TCVos 10μV/°C max
CMRR 90 dB Min
Input Offset Voltage 1 mV Max
CMVR at VS = 3.3V −4V to 27V
CMVR at VS = 5.0V −22V to 60V
Operating Ambient Temperature Range −40°C
to 125°C
•
•
•
Single Supply Bidirectional Operation
All Min / Max Limits 100% Tested
The parts have a precise gain of 50x for the
LMP8602 and 100x for the LMP8603, which are
adequate in most targeted applications to drive an
ADC to its full scale value. The fixed gain is achieved
in two separate stages, a preamplifier with a gain of
10x and an output stage buffer amplifier with a gain
of 5x for the LMP8602 and 10x for the LMP8603. The
connection between the two stages of the signal path
is brought out on two pins to enable the possibility to
create an additional filter network around the output
buffer amplifier. These pins can also be used for
alternative configurations with different gain as
described in the applications section.
LMP8602Q and LMP8603Q Available in
Automotive AEC-Q100 Grade 1 Qualified
Version
APPLICATIONS
•
High Side and Low Side Driver Configuration
Current Sensing
•
•
•
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•
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Bidirectional Current Measurement
Current Loop to Voltage Conversion
Automotive Fuel Injection Control
Transmission Control
Power Steering
Battery Management Systems
Typical Applications
D
S
I
I
L
Inductive
Load
C
load
G
+5V
48V
48V
I
B
+
-
+5V
+3.3V
+
-
+
-
Charger
D
S
G
Inductive
Load
24V
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
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 © 2009–2013, Texas Instruments Incorporated