load

+

-

S

D

G

24V

28V

+

-

+

-

S

D

G

28V

Inductive

Load

Inductive

Load

+5V

LMP8278

+5V

+5V

LMP8278

LMP8278

LMP8278

www.ti.com

SNAS575A – FEBRUARY 2012 – REVISED MARCH 2013

LMP8278Q High Common Mode, 14 x Gain, Precision Current Sensing Amplifier

Check for Samples: LMP8278

1

FEATURES

DESCRIPTION

The LMP8278 is a fixed 14x gain precision current

23

•

TCVos ±15

μV/°C Max

sense amplifier. The part amplifies and filters small

•

CMRR 80 dB Min

differential signals in the presence of high common

•

Input Offset Voltage ±2 mV max

mode voltages. The part operates from a single 5V

supply voltage. With an input common mode voltage

•

CMVR

−2V to 40V

range from -2V to +28V the gain is very precise

•

Operating Ambient Temperature Range

−40°C

(±0.5%). The part can handle common mode voltages

to 125°C

in the range -2V to +40V with relaxed specifications.

•

Single Supply Operation

The LMP8278 is a member of the Linear Monolithic

Precision

(

LMP™)

family

and

is

ideal

for

•

Min / Max Limits 100% Tested unless

unidirectional

current

sensing

applications.

The

Otherwise Noted

parameter values that are shown in the Electrical

•

LMP8278Q Available in Automotive AEC-Q100

Characteristics table are 100% tested and all bold

Grade 1 Qualified Version

values are also 100% tested over temperature,

unless otherwise noted.

APPLICATIONS

The part has a precise gain of 14x which is adequate

•

High Side and Low Side Driver Configuration

in most targeted applications to drive an ADC to its

Current Sensing

full scale value. The fixed gain is achieved in two

separate stages, a preamplifier with a gain of 7x and

•

Automotive Fuel Injection Control

an output stage buffer amplifier with a gain of 2x. The

•

Transmission Control

connection between the two stages of the signal path

•

Power Steering

is brought out on two pins to enable the possibility to

create an additional filter network around the output

•

Battery Management Systems

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.

Typical Applications

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.

2

LMP is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.