Charger

load

+

-

+3.3V

24V

48V

+

-

+

-

48V

Inductive

Load

Inductive

Load

+5V

+5V

S

D

G

S

D

G

LMP8601, LMP8601-Q1

www.ti.com

SNOSAR2E – SEPTEMBER 2008 – REVISED MARCH 2013

60-V Common-Mode Bidirectional Precision Current Sensing Amplifier

Check for Samples: LMP8601, LMP8601-Q1

1

FEATURES

DESCRIPTION

The LMP8601 and LMP8601Q are fixed 20x gain

2

•

precision amplifiers. The part will amplify and filter

small differential signals in the presence of high

–

common mode voltages. The input common mode

–

CMRR 90 dB Min

voltage range is –22V to +60V when operating from a

single 5V supply. With 3.3V supply, the input

–

Input offset voltage 1 mV Max

common mode voltage range is from –4V to +27V.

–

The LMP8601 and LMP8601Q are members of the

–

ideal parts for unidirectional and bidirectional current

–

Operating Ambient Temperature Range -

sensing applications. All parameter values of the part

40°C to 125°C

that are shown in the tables are 100% tested and all

–

LMP8601Q Available in Automotive AEC-

bold values are also 100% tested over temperature.

Q100 Grade 1 Qualified Version

The part has a precise gain of 20x which is adequate

–

Single-Supply Bidirectional Operation

in most targeted applications to drive an ADC to its

–

All Min / Max Limits 100% Tested

full scale value. The fixed gain is achieved in two

separate stages, a preamplifier with a gain of 10x and

APPLICATIONS

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

connection between the two stages of the signal path

•

High-Side and Low-Side Driver Configuration

is brought out on two pins to enable the possibility to

Current Sensing

create an additional filter network around the output

•

Bidirectional Current Measurement

buffer amplifier. These pins can also be used for

alternative

configurations

with

different

gain

as

•

Current Loop to Voltage Conversion

described in Application Information.

•

Automotive Fuel Injection Control

•

Transmission Control

•

Power Steering

•

Battery Management Systems

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

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, 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.