LMP8640 Current Sense Amplifiers


National Semiconductor's precision high voltage current sense amplifiers


National Semiconductor - LMP8640 Current Sense Amplifier National Semiconductor's LMP8640 and the LMP8640HV are precision current sense amplifiers that detect small differential voltages across a sense resistors in the presence of high input common mode voltages with supply voltage ranges from 2.7V to 12V. The LMP8640 amplifiers accept input signals with a common mode voltage range from -2V to 42V, while the LMP8640HV accepts input signal with common mode voltage range from -2V to 76V. The LMP8640 and LMP8640HV have fixed gain for applications that demand accuracy over temperature. They offer three different fixed gains, 20V/V, 50V/V, and 100V/V, ensuring gain accuracy as low as 0.25%. 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. These amplifiers also have excellent AC and DC specifications over temperature, and keeps errors in the current sense loop to a minimum. The LMP8640 and LMP8640HV are ideal choice for industrial, automotive and consumer applications, and it is available in TSOT-6 package.

   Features    Applications
  • Typical values, TA = 25°C
  • Supply voltage range: 2.7V to 12V
  • Gain options: 20V/V, 50V/V, 100V/V
  • Max gain error: 0.25%
  • Low offset voltage: 900µV
  • Input bias current: 13µA
  • PSRR: 85dB
  • CMRR (2.1V to 42V): 103dB
  • Temperature range: -40°C to 125°C
  • High-side current sense
  • Vehicle current measurement
  • Motor controls
  • Battery monitoring
  • Remote sensing
  • Power management

ICs - Available in Tape & Reel (CT-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)
Digi-Key Part Number Gain Bandwidth Product Package  
LMP8640MK-H/NOPBCT-ND 230kHz 6-Pin TSOT LMP8640 Datasheet
LMP8640MK-F/NOPBCT-ND 450kHz 6-Pin TSOT LMP8640 Datasheet
LMP8640MK-T/NOPBCT-ND 950kHz 6-Pin TSOT LMP8640 Datasheet
LMP8640MKE-H/NOPBCT-ND 230kHz 6-Pin TSOT LMP8640 Datasheet
LMP8640MKE-F/NOPBCT-ND 450kHz 6-Pin TSOT LMP8640 Datasheet
LMP8640MKE-T/NOPBCT-ND 950kHz 6-Pin TSOT LMP8640 Datasheet
LMP8640HVMKE-H/NOPBCT-ND 230kHz 6-Pin TSOT LMP8640 Datasheet
LMP8640HVMKE-F/NOPBCT-ND 450kHz 6-Pin TSOT LMP8640 Datasheet
LMP8640HVMKE-T/NOPBCT-ND 950kHz 6-Pin TSOT LMP8640 Datasheet

Evaluation Boards
Digi-Key Part Number Description
LMP8640HV-FEVAL/NOPB-ND This eval board shows a bidirectional high side current sense made using LMP8640 and optional differential amplifier in order to have a single output. (450kHz)
LMP8640HV-TEVAL/NOPB-ND This eval board shows a bidirectional high side current sense made using LMP8640 and optional differential amplifier in order to have a single output. (950kHz)