LMP8480_15 Datasheet, PDF (1/29 Pages) Texas Instruments – LMP848x Precision 76-V High-Side Current Sense Amplifiers With Voltage Output

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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
•1 Typical Values, T_A = 25°C
• Bidirectional or Unidirectional Sensing
• Common Mode Voltage Range 4.0 V to 76 V
• Supply Voltage Range 4.5 V to 76 V
• Fixed Gains 20, 60 and 100 V/V
• Gain Accuracy ±0.1%
• Offset ±80 µV
• Bandwidth (–3dB) 270 kHz
• Quiescent Current < 100 µA
• Buffered High-Current Output > 5 mA
• Input Bias Current 7 µA
• PSRR (DC) 122 dB
• CMRR (DC) 124 dB
• Temperature Range –40°C to 125°C
• 8-Pin VSSOP Package
2 Applications
• High-Side Current Sense
• Vehicle Current Measurement
• Telecommunications
• Motor Controls
• Laser or LED Drivers
• Energy Management
• Solar Panel Monitoring
Typical Application Schematic
3 Description
The LMP8480 and LMP8481 are precision high-side
current sense amplifiers that amplify a small
differential voltage developed 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 4 V to 76 V 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 monitored, resulting in reduced
component count and board space.
The LMP848x family consists of fixed gains of 20, 60
and 100 for applications that demand high accuracy
over temperature. The low-input offset voltage allows
the use of smaller sense resistors without sacrificing
system error. The wide operating temperature range
of –40°C to 125°C makes the LMP848x an ideal
choice for automotive, telecommunications, industrial,
and consumer applications. The LMP8480 and
LMP8481 are pin-for-pin replacements for the
MAX4080 and MAX4081, offering improved offset
voltage, wider reference adjust range and higher
output drive capabilities. The LMP8480 and LMP8481
are available in a 8-pin VSSOP package.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
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.