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Product details

Parameters

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 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
    • 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
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Description

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
* Datasheet LMP8645, LMP8645HV Precision High Voltage Current Sense Amplifier datasheet (Rev. G) Sep. 30, 2015
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
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
$49.00
Description

The LMP8645 Current Sense Evaluation Board is designed to evaluate the LMP8645, Precision Current Sensing Amplifier with adjustable gain. This board show a typical configuration of a bidirectional current sense with two LMP8645 parts mounted on the PCB together with the required de-coupling (...)

Design tools & simulation

SIMULATION MODELS Download
SNOM087A.ZIP (18 KB) - PSpice Model
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

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