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LMP8480, LMP8481

SNVS829C – MARCH 1999 – REVISED SEPTEMBER 2015

LMP848x Precision 76-V High-Side Current Sense Amplifiers With Voltage Output

1 Features

3 Description

The LMP8480 and LMP8481 are precision high-side

1

•

current

sense

amplifiers

that

amplify

a

small

•

Bidirectional or Unidirectional Sensing

differential voltage developed across a current sense

•

Common Mode Voltage Range 4.0 V to 76 V

resistor in the presence of high input common-mode

voltages.

These

amplifiers

are

designed

for

•

Supply Voltage Range 4.5 V to 76 V

bidirectional (LMP8481) or unidirectional (LMP8480)

•

Fixed Gains 20, 60 and 100 V/V

current applications and will accept input signals with

•

Gain Accuracy ±0.1%

common-mode voltage range from 4 V to 76 V with a

bandwidth of 270 kHz. Since the operating power

•

Offset ±80 µV

supply range overlaps the input common-mode

•

Bandwidth (–3dB) 270 kHz

voltage range, the LMP848x can be powered by the

•

Quiescent Current < 100 µA

same voltage that is being monitored. This benefit

•

Buffered High-Current Output > 5 mA

eliminates the need for an intermediate supply

voltage to be routed to the point of load where the

•

Input Bias Current 7 µA

current is being monitored, resulting in reduced

•

PSRR (DC) 122 dB

component count and board space.

•

CMRR (DC) 124 dB

The LMP848x family consists of fixed gains of 20, 60

•

Temperature Range –40°C to 125°C

and 100 for applications that demand high accuracy

•

8-Pin VSSOP Package

over temperature. The low-input offset voltage allows

the use of smaller sense resistors without sacrificing

2 Applications

system error. The wide operating temperature range

of –40°C to 125°C makes the LMP848x an ideal

•

High-Side Current Sense

choice for automotive, telecommunications, industrial,

•

Vehicle Current Measurement

and

consumer

applications.

The

LMP8480

and

LMP8481

are

pin-for-pin

replacements

for

the

•

Telecommunications

MAX4080 and MAX4081, offering improved offset

•

Motor Controls

voltage, wider reference adjust range and higher

•

Laser or LED Drivers

output drive capabilities. The LMP8480 and LMP8481

•

Energy Management

are available in a 8-pin VSSOP package.

•

Solar Panel Monitoring

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

Typical Application Schematic

LMP8480

VSSOP (8)

3.00 mm x 3.00 mm

LMP8481

VSSOP (8)

3.00 mm x 3.00 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.