The LMP8278 is a fixed 14x gain precision current sense amplifier. The part amplifies and
filters small differential signals in the presence of high common mode voltages. The part operates
from a single 5V supply voltage. With an input common mode voltage range from -2V to +28V the gain
is very precise (±0.5%). The part can handle common mode voltages in the range -2V to +40V with
relaxed specifications. The LMP8278 is a member of the Linear Monolithic Precision (LMP) family and is ideal for unidirectional current sensing
applications. The parameter values that are shown in the Electrical Characteristics table are 100%
tested and all bold values are also 100% tested over temperature, unless otherwise noted.
The part has a precise gain of 14x 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 7x 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 LMP8278Q 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.
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