Product details

Common mode voltage (Max) (V) 42 Common mode voltage (Min) (V) -2 Input offset (+/-) (Max) (uV) 1000 Input offset drift (+/-) (Typ) (uV/C) 4 Gain (V/V) Adjustable Gain error (%) 2 Gain error drift (+/-) (Max) (ppm/°C) 140 CMRR (Min) (dB) 60 Bandwidth (kHz) 990 Supply voltage (Max) (V) 12 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.61 Number of channels (#) 1 Comparators (#) 0 Features Low-side Capable, Programmable Gain Rating Catalog Operating temperature range (C) -40 to 125
Common mode voltage (Max) (V) 42 Common mode voltage (Min) (V) -2 Input offset (+/-) (Max) (uV) 1000 Input offset drift (+/-) (Typ) (uV/C) 4 Gain (V/V) Adjustable Gain error (%) 2 Gain error drift (+/-) (Max) (ppm/°C) 140 CMRR (Min) (dB) 60 Bandwidth (kHz) 990 Supply voltage (Max) (V) 12 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.61 Number of channels (#) 1 Comparators (#) 0 Features Low-side Capable, Programmable Gain Rating Catalog Operating temperature range (C) -40 to 125
SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6
  • 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
  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet LMP8645, LMP8645HV Precision High Voltage Current Sense Amplifier datasheet (Rev. H) PDF | HTML 02 May 2022
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Technical article Solving the multidecade current-measurement challenge in your 48-V BMS application 14 Jun 2021
Technical article How current-sense amplifiers monitor satellite health 08 Feb 2021
Technical article A key to accurate system thermal management: monitoring both current flow and temperature 04 Oct 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article System trade-offs for high- and low-side current measurements 01 Jun 2017
EVM User's guide AN-1975 LMP8640 / LMP8645 Evaluation Board User Guide (Rev. C) 26 Apr 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

LMP8645 PSPICE Model (Rev. A)

SNOM087A.ZIP (18 KB) - PSpice Model
Calculation tool

CS-AMPLIFIER-ERROR-TOOL — Current sense amplifier comparison and error tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Reference designs

TIDA-00302 — Current Shunt Monitor with Transient Robustness Reference Design

This high-side current shunt monitor is used to measure the voltage developed across a current-sensing resistor when current passes through it.

Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)

Design guide: PDF
Schematic: PDF
Package Pins Download
SOT-23-THIN (DDC) 6 View options

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