Product details


Common mode voltage (Max) (V) 76 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) 55 Bandwidth (kHz) 35 Supply voltage (Max) (V) 12 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 3.11 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


  • Provides Circuit Protection and Current Limiting
  • Single Supply Operation
  • –2-V to 76-V Common-Mode Voltage Range
  • Variable Gain Set by External Resistor
  • Adjustable Bandwidth Set by External Capacitor
  • Buffered Output
  • 3% Output Accuracy Achievable at VSENSE = 100 mV
  • Key Specifications:
    • Supply Voltage Range 2.7 V to 12 V
    • Output Current (Source) 0 to 5 mA
    • Gain Accuracy 2.0% (max)
    • Transconductance 200 µA/V
    • Offset ±1 mV (Maximum)
    • Quiescent Current 380 µA
    • Input Bias 12 µA (Typical)
    • PSRR 85 dB
    • CMRR 95 dB
    • Temperature Range −40°C to 125°C
    • 6-Pin SOT Package

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The LMP8646 is a precision current limiter used to improve the current limit accuracy of any switching or linear regulator with an available feedback node.

The LMP8646 accepts input signals with a common-mode voltage ranging from –2 V to 76 V. It has a variable gain which is used to adjust the sense current. The gain is configured with a single external resistor, RG, providing a high level of flexibility and accuracy up to 2%. The adjustable bandwidth, which allows the device to be used with a variety of applications, is configurable with a single external capacitor in parallel with RG. In addition, the output is buffered in order to provide a low output impedance.

The LMP8646 is an ideal choice for industrial, automotive, telecommunications, and consumer applications where circuit protection and improved precision systems are required. The LMP8646 is available in a 6-pin SOT package and can operate at temperature range of −40°C to 125°C.

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Technical documentation

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Type Title Date
* Data sheet LMP8646 Precision Current Limiter datasheet (Rev. B) Dec. 08, 2014
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
Technical article A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article System trade-offs for high- and low-side current measurements Jun. 01, 2017
Application note Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers Feb. 28, 2017
Technical article Why should you care about overcurrent protection in your system? Jun. 16, 2016
Application note AN-2219 Precision Current Limiting with the LMP8646 and LP38501 (Rev. A) Apr. 24, 2013
Application note AN-2200 Precision Current Limiting with the LMP8646 and LMZ12003 (Rev. A) Apr. 23, 2013
Application note AN-2218 Precision Current Limiting with the LMP8646 and LM3102 (Rev. A) Apr. 23, 2013
User guide LMP8646EB User's Guide Feb. 13, 2012

Design & development

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

Hardware development

document-generic User guide

The LMP8646 Evaluation Board (LMP8646EB) is designed to ease evaluation and design-in of TI's LMP8646, a Precision Current Limiter. The LMP8646 is used to detect small differential voltages across a sense resistor in the presence of high input common mode voltages. On board with the current limiter (...)

  • Provides circuit protection and current limiting
  • Single supply operation
  • -2V to +76V common mode voltage range
  • Variable gain set by external resistor
  • Adjustable bandwidth set by external capacitor
  • Buffered output
  • 3% output accuracy achievable at VSENSE - 100 mV
document-generic User guide

The TPS63802HDKEVM is a universal development tool designed to help the users easily and quickly evaluate and test the most common buck-boost converter use-cases. The use-cases include backup power, input current limit, LED driver, digital voltage scaling, bypass mode and precise enable. The user (...)

  • Universal Tool to test most common buck-boost converter use-cases
  • Use-cases: backup power, input current limit, LED driver, digital voltage scaling, bypass mode and precise enable
  • Change quickly between use-cases without soldering
  • All use-cases are tested and the user guide includes quick-start (...)

Design tools & simulation

SNOM308.ZIP (15 KB) - PSpice Model
SNOM319.TSC (37 KB) - TINA-TI Reference Design
SNOM320.ZIP (4 KB) - TINA-TI Spice Model
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 (...)
  • 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
  • (...)
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

CAD/CAE symbols

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Ordering & quality

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