Top

Product details

Parameters

Common mode voltage (Max) (V) 42 Common mode voltage (Min) (V) -2 Input offset (+/-) (Max) (uV) 900 Input offset drift (+/-) (Typ) (uV/C) 1.2 Gain (V/V) 100, 20, 50 Gain error (%) 0.25 Gain error drift (+/-) (Max) (ppm/°C) 26.2 CMRR (Min) (dB) 60 Bandwidth (kHz) 950, 450, 230 Supply voltage (Max) (V) 12 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.722 Number of channels (#) 1 Comparators (#) 0 Features Low-side Capable Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Package | Pins | Size

SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6 open-in-new Find other Current sense amplifiers analog output

Features

  • Typical Values, TA = 25°C
  • High Common-Mode Voltage Range
    • LMP8640: –2 V to 42 V
    • LMP8640-Q1: –2 V to 42 V, AEC-Q100
    • LMP8640HV: –2 V to 76 V
  • Supply Voltage Range: 2.7 V to 12 V
  • Gain Options: 20 V/V; 50 V/V; 100 V/V
  • Max Gain Error: 0.25%
  • Low Offset Voltage: 900 µV
  • Input Bias Current: 13 µA
  • PSRR: 85 dB
  • CMRR (2.1V to 42V): 103 dB
  • Temperature Range: –40°C to 125°C
  • 6-Pin Thin SOT-23 Package
open-in-new Find other Current sense amplifiers analog output

Description

The LMP8640, LMP8640-Q1 and the LMP8640HV 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 LMP8640 and LMP8640-Q1 accept input signals with common mode voltage range from –2 V to 42 V, while the LMP8640HV accepts input signal with common mode voltage range from –2 V to 76 V. The LMP8640 and LMP8640HV have fixed gain for applications that demand accuracy over temperature. The LMP8640 and LMP8640HV come out with three different fixed gains 20 V/V, 50 V/V, 100 V/V ensuring a 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, 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 and consumer applications, while the LMP8640-Q1 is an AEC-Q100 grade 1 qualified version of the LMP8640 for automotive applications. The LMP8640-x is available in SOT-23-6 package.

open-in-new Find other Current sense amplifiers analog output
Download
Similar products you might be interested in
open-in-new Compare products
Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
INA186 ACTIVE 40V, bi-directional, high-precision current sense amplifier w/ picoamp IB & ENABLE This product offers better Vos, gain error, and temperature drift parameters

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet LMP8640/-Q1/HV Precision High Voltage Current Sense Amplifiers datasheet (Rev. G) Nov. 12, 2014
Technical articles A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Selection guides Current Sense Amplifiers (Rev. D) Apr. 04, 2018
Technical articles System trade-offs for high- and low-side current measurements Jun. 01, 2017
Technical articles Why should you care about overcurrent protection in your system? Jun. 16, 2016
Technical articles How to get started with current sense amplifiers – part 2 May 26, 2015
User guides AN-1975 LMP8640 / LMP8645 Evaluation Board User Guide (Rev. C) Apr. 26, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
49
Description

The LMP8640HV-F Current Sense Evaluation Board is designed to evaluate the LMP8640HV-F, Precision Current Sensing Amplifier with fixed gain of 50V/V. This board show a typical configuration of a bidirectional current sense with two LMP8640HV-F parts mounted on the PCB together with the required (...)

EVALUATION BOARDS Download
document-generic User guide
49
Description

The LMP8640HV-H Current Sense Evaluation Board is designed to evaluate the LMP8640HV-H, Precision Current Sensing Amplifier with fixed gain of 100V/V. This board show a typical configuration of a bidirectional current sense with two LMP8640HV-H parts mounted on the PCB together with the required (...)

EVALUATION BOARDS Download
document-generic User guide
49
Description

The LMP8640HV-T Current Sense Evaluation Board is designed to evaluate the LMP8640HV-T, Precision Current Sensing Amplifier with fixed gain of 20V/V. This board show a typical configuration of a bidirectional current sense with two LMP8640HV-T parts mounted on the PCB together with the required (...)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI 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 (...)
document-generic User guide

Reference designs

REFERENCE DESIGNS Download
Current Shunt Monitor with Transient Robustness Reference Design
TIDA-00302 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 (...)

document-generic Schematic document-generic User guide
Design files

CAD/CAE symbols

Package Pins Download
SOT-23-THIN (DDC) 6 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos

Related videos