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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.