LMP8645/LMP8645HV High Voltage Current Sense Amplifiers

National Semiconductor's precision current sense amplifiers detect small differential voltages

National Semiconductor LMP8645 High Voltage Current Sense AmplifierNational Semiconductor's 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 2.7V to 12V.

The LMP8645 accepts input signals with common mode voltage range from -2V to 42V, while the LMP8645HV accepts input signal with common mode voltage range from -2V to 76V. 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.     LMP8645 Datasheet

  • Features & Applications
  • Diagram
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  • High common-mode voltage range
    • LMP8645: -2V to 42V
    • LMP8645HV: -2V to 76V
  • Supply voltage range: 2.7V to 12V
  • Gain configurable with a single resistor
  • Max. variable gain accuracy (with external resistor): 2.0%
  • Transconductance: 200µA/V
  • Low offset voltage: 1mV
  • Input bias: 12µA
  • 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

  • RoHS Compliant

Typical Application Diagram

National Semiconductor LMP8645 Typical Application Diagram

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 Available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)
Part Number
National Semi
Part Number
accepts input signals with common mode voltage range from -2V to 42V
accepts input signals with common mode voltage range from -2V to 76V