LMP8601_14 Datasheet, PDF (1/29 Pages) Texas Instruments – LMP8601/LMP8601Q 60V Common Mode, Bidirectional Precision Current Sensing Amplifier

LMP8601, LMP8601Q
www.ti.com
SNOSAR2D – SEPTEMBER 2008 – REVISED OCTOBER 2009
LMP8601/LMP8601Q 60V Common Mode, Bidirectional Precision Current Sensing
Amplifier
Check for Samples: LMP8601, LMP8601Q
FEATURES
1
•2 Unless otherwise noted, typical values at T_A =
25°C, V_S = 5.0V, Gain = 20x
• 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
• LMP8601Q available in Automotive AEC-Q100
Grade 1 qualified version
• Single supply bidirectional operation
• All Min / Max limits 100% tested
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 LMP8601 and LMP8601Q are fixed 20x gain precision amplifiers. The part 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 3.3V supply, the input common mode voltage range
is from –4V to +27V. The LMP8601 and LMP8601Q 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 part that are shown in the tables are 100% tested and all bold values are also 100% tested over temperature.
The part has a precise gain of 20x which is 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 2x. 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 .
The mid-rail offset adjustment pin enables the user to use these devices for bidirectional single supply voltage
current sensing. The output signal is bidirectional and mid-rail referenced when this pin is connected to the
positive supply rail. With the offset pin connected to ground, the output signal is unidirectional and ground-
referenced .
The LMP8601Q incorporates enhanced manufacturing and support processes for the automotive market,
including defect detection methodologies. Reliability qualification is compliant with the requirements and
temperature grades defined in the AEC Q100 standard.
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 © 2008–2009, Texas Instruments Incorporated