LMP8645 - 42V, Configurable Gain, Low-/High-Side, High-Speed, Voltage Output Current Sensing Amplifier

Updated : 2020-01-09 14:22:53
Description

The LMP8645 and the LMP8645HV devices are precision current sense amplifiers that detect small differential voltages across a sense resistor in the presence of high-input common-mode voltages.

Operating from a supply range of 2.7 V to 12 V, the LMP8645 accepts input signals with a common-mode voltage range of –2 V to 42 V, while the LMP8645HV accepts input signals with a common-mode voltage range of –2 V to 76 V. The LMP8645 and LMP8645HV have adjustable gain for applications where supply current and high common-mode voltage are the determining factors. The gain is configured with a single resistor, providing a high level of flexibility, as well as accuracy as low as 2% (maximum) including the gain setting resistor. The output is buffered to provide low output impedance. This high-side current sense amplifier is ideal for sensing and monitoring currents in DC or battery-powered systems, has excellent AC and DC specifications over temperature, and keeps errors in the current sense loop to a minimum. The LMP8645 is an ideal choice for industrial, automotive, and consumer applications, and is available in SOT-6 package.

Products containing the "LMP8645" keyword are: LMP8645HVMK , LMP8645HVMK/NOPB , LMP8645HVMK/NOPB , LMP8645HVMKE , LMP8645HVMKE/NOPB , LMP8645HVMKE/NOPB , LMP8645HVMKENOPB , LMP8645HVMKNOPB , LMP8645HVMKX , LMP8645HVMKX/NOPB , LMP8645HVMKX/NOPB , LMP8645MK , LMP8645MK/NOPB , LMP8645MK/NOPB , LMP8645MKE , LMP8645MKE/NOPB , LMP8645MKE/NOPB , LMP8645MKENOPB , LMP8645MKEVAL/NOPB , LMP8645MKEVAL/NOPB
Features

  • Typical Values, TA = 25°C
  • High Common-Mode Voltage Range
    • LMP8645 –2 V to 42 V
    • LMP8645HV –2 V to 76 V
  • Supply Voltage Range 2.7 V to 12 V
  • Gain Configurable With a Single Resistor
  • Maximum Variable Gain Accuracy (With
    External Resistor) 2%
  • Transconductance 200 µA/V
  • Low Offset Voltage 1 mV
  • Input Bias 12 µA
  • PSRR 90 dB
  • CMRR 95 dB
  • Temperature Range –40°C to 125°C
  • 6-Pin SOT Package

Parametrics
StatusACTIVE
SubFamilyCurrent sense amplifiers analog output
Common mode voltage42
RatingCatalog
FeaturesLow-side Capable
Supply Voltage2.7
Input offset (+/-)1000
Input offset drift (+/-)4
GainAdjustable
Gain error2
CMRR60
Bandwidth990
Iq0.61
Approx. price0.85 | 1ku
Operating temperature range-40 to 125
Package GroupSOT-23-THIN|6
Package size: mm2:W x L (PKG)[pf]6SOT-23-THIN[/pf]: 8 mm2: 2.8 x 2.9 (SOT-23-THIN|6)