LMP8602_15 Datasheet, PDF (1/34 Pages) Texas Instruments – 60V Common Mode, Fixed Gain, Bidirectional Precision Current Sensing Amplifier

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
FEATURES
1
•2 Unless Otherwise Noted, Typical Values at T_A
= 25°C, V_S = 5.0V, Gain = 50x (LMP8602), Gain
= 100x (LMP8603)
• TCV_os 10μV/°C max
• CMRR 90 dB Min
• Input Offset Voltage 1 mV Max
• CMVR at V_S = 3.3V −4V to 27V
• CMVR at V_S = 5.0V −22V to 60V
• Operating Ambient Temperature Range −40°C
to 125°C
• Single Supply Bidirectional Operation
• All Min / Max Limits 100% Tested
• LMP8602Q and LMP8603Q Available in
Automotive AEC-Q100 Grade 1 Qualified
Version
APPLICATIONS
• High Side and Low Side Driver Configuration
Current Sensing
• Bidirectional Current Measurement
• Current Loop to Voltage Conversion
• Automotive Fuel Injection Control
• Transmission Control
• Power Steering
• Battery Management Systems
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.
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.
Typical Applications
Inductive
D
48V
Load
+5V
G
48V
+
S
+5V
-
+
D
-
G
Inductive
S
Load
I_C
Charger
I_L
load
I_B
+3.3V
+
-
24V
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.
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