LMP8481 Datasheet, PDF (1/28 Pages) Texas Instruments – Precision 76V High-Side Current Sense Amplifiers with Voltage Output

LMP8480 / LMP8481
Precision 76V High-Side Current Sense Amplifiers with Voltage Output
General Description
The LMP8480 and LMP8481 are precision high-side current
sense amplifiers that amplify a small differential voltage de-
veloped across a current sense resistor in the presence of
high input common-mode voltages.
These amplifiers are designed for bidirectional (LMP8481) or
unidirectional (LMP8480) current applications and will accept
input signals with common-mode voltage range from 4V to
76V with a bandwidth of 270 kHz.
Since the operating power supply range overlaps the input
common mode voltage range, the LMP848x can be powered
by the same voltage that is being monitored. This benefit
eliminates the need for an intermediate supply voltage to be
routed to the point of load where the current is being moni-
tored, resulting in reduced component count and board
space.
The LMP848x family consists of fixed gains of 20, 50, 60 and
100 for applications that demand high accuracy over temper-
ature. The low input offset voltage allows the use of smaller
sense resistors without sacrificing system error.
The wide operating temperature range of -40C to 125C makes
the LMP848x an ideal choice for automotive, telecommuni-
cations, industrial, and consumer applications.
The LMP8480 and LMP8481 are pin for pin replacements for
the MAX4080 and MAX4081, offering improved offset volt-
age, wider reference adjust range and higher output drive
capabilities.
The LMP8480 and LMP8481 are available in a 8-pin MSOP
package and the LMP8481 is also available in a 8–pad LLP.
Typical Application
Features
Typical values, T_A = 25°C
● ^{Bi-Directional or Uni-Directional Sensing}
● ^{Common Mode Voltage Range}
4.0V to 76V
● ^{Supply Voltage Range}
4.5V to 76V
● ^{Fixed Gains}
20, 50, 60 and 100 V/V
● ^{Gain Accuracy}
±0.1%
● ^Offset
±80µV
● ^{Bandwidth (-3dB)}
270KHz
● ^{Quiescent Current}
<100µA
● ^{Buffered High-Current Output}
>5mA
● ^{Input Bias Current}
7µA
● ^{PSRR (DC)}
122dB
● ^{CMRR (DC)}
124dB
● ^{Temperature Range}
-40 to +125°C
● ^{MSOP-8 or LLP-8 Packages}
Applications
● ^{High-side current sense}
● ^{Vehicle current measurement}
● ^{Telecommunications}
● ^{Motor controls}
● ^{Laser or LED Drivers}
● ^{Energy Management}
● ^{Solar Panel Monitoring}
30191535
LMP™ is a trademark of National Semiconductor Corporation.
PRODUCTION DATA information is current as of
publication date. Products conform to specifications per
the terms of the Texas Instruments standard warranty.
Production processing does not necessarily include
testing of all parameters.
301915 SNVS829A
Copyright © 1999-2012, Texas Instruments Incorporated