1FEATURES
23• TCVos ±15μV/°C Max
• CMRR 80 dB Min
• Input Offset Voltage ±2 mV max
• CMVR −2V to 40V
• Operating Ambient Temperature Range −40°C
to 125°C
• Single Supply Operation
• Min / Max Limits 100% Tested unless
Otherwise Noted
• LMP8278Q Available in Automotive AEC-Q100
Grade 1 Qualified Version

APPLICATIONS
• High Side and Low Side Driver Configuration
Current Sensing
• Automotive Fuel Injection Control
• Transmission Control
• Power Steering
• Battery Management Systems

DESCRIPTION
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 Application Information.
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.