LMP8645/LMP8645HV High Voltage Current Sense Amplifiers

Texas Instruments' precision current sense amplifiers detect small differential voltages

Image of Texas Instruments' LMP8645/LMP8645HV High Voltage Current Sense AmplifiersTexas Instruments' LMP8645 and LMP8645HV are precision current sense amplifiers that detect small differential voltages across a sense resistor in the presence of high input common mode voltages with a supply voltage range from 2.7 V to 12 V.

The LMP8645 accepts input signals with common mode voltage range from -2 V to 42 V , while the LMP8645HV accepts input signal with common mode voltage range from -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, the accuracy could be as low as 2% (max.) including the gain setting resistor. The output is buffered in order to provide low output impedance. This high side current sense amplifier is ideal for sensing and monitoring currents in DC or battery powered systems, 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 it is available in TSOT-6 package.

Features Applications
  • 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
  • Max. variable gain accuracy (with external resistor): 2.0%
  • Transconductance: 200 µA/V
  • Low offset voltage: 1 mV
  • Input bias: 12 µA
  • PSRR: 90 dB
  • CMRR: 90 dB
  • Temperature range: −40°C to 125°C
  • 6-Pin TSOT package
  • High-side current sense
  • Vehicle current measurement
  • Motor controls
  • Battery monitoring
  • Remote sensing
  • Power management

High Voltage Current Sense Amplifiers

ImageManufacturer Part NumberDescriptionAmplifier TypeNumber of CircuitsAvailable Quantity
LMP8645MKE/NOPB datasheet linkIC OPAMP CURR SENSE 6SOTLMP8645MKE/NOPBIC OPAMP CURR SENSE 6SOTCurrent Sense13381 - Immediate
LMP8645MKE/NOPB product page link
LMP8645HVMKE/NOPB product page link
Published: 2010-07-22