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
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
SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6
  • 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
  • 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

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.

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) 08 Dec 2014
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
Application note Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers 28 Feb 2017
Application note AN-2219 Precision Current Limiting with the LMP8646 and LP38501 (Rev. A) 24 Apr 2013
Application note AN-2200 Precision Current Limiting with the LMP8646 and LMZ12003 (Rev. A) 23 Apr 2013
Application note AN-2218 Precision Current Limiting with the LMP8646 and LM3102 (Rev. A) 23 Apr 2013
User guide LMP8646EB User's Guide 13 Feb 2012

Design & development

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

Evaluation board

LMP8646EB — LMP8646 Evaluation Board

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 (...)

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Evaluation board

TPS63802HDKEVM — TPS63802HDKEVM - Hardware Development Kit

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 (...)

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Simulation model

LMP8646 PSpice Model

SNOM308.ZIP (15 KB) - PSpice Model
Simulation model

LMP8646 TINA-TI Reference Design

SNOM319.TSC (37 KB) - TINA-TI Reference Design
Simulation model

LMP8646 TINA-TI Spice Model

SNOM320.ZIP (4 KB) - TINA-TI Spice Model
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 (...)
Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

This bidirectional current sensing solution uses a current-sense amplifier and a high-speed dual comparator with a rail-to-rail input common mode range to create over-current (OC) alert signals at the comparator outputs (OUTA and OUTB) if the input current (IG1) rises above 100 A or falls below (...)
Design tool

CIRCUIT060037 — Precision over-current latch circuit

This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The (...)
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