LMP8646

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-2 to 76V, configurable gain and bandwidth, high-speed current limiter

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Product details

Parameters

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

Features

  • 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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Description

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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LMP8646 Precision Current Limiter datasheet (Rev. B) Dec. 08, 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
Technical articles System trade-offs for high- and low-side current measurements Jun. 01, 2017
Application notes Precision LED Brightness and Color Mixing With Discrete Current Sense Amplifiers Feb. 28, 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
Application notes AN-2219 Precision Current Limiting with the LMP8646 and LP38501 (Rev. A) Apr. 24, 2013
Application notes AN-2200 Precision Current Limiting with the LMP8646 and LMZ12003 (Rev. A) Apr. 23, 2013
Application notes AN-2218 Precision Current Limiting with the LMP8646 and LM3102 (Rev. A) Apr. 23, 2013
User guides 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

EVALUATION BOARDS Download
document-generic User guide
49
Description
  • Low component count and small solution size
  • Stable with ceramic and other low ESR capacitors
  • No loop compensation required
  • High efficiency at a light load by DCM operation
  • Pre-bias startup
  • Ultra-fast transient response
  • Programmable soft-start
  • Programmable switching frequency up to 1 MHz
  • Valley current limit (...)
Features
  • Input voltage range of 4.5V -42V
  • 2..5A output current
  • 0.8V, 1.5% reference
  • Integrated dual N-Channel main and synchronous MOSFETs
  • Thermally enhanced eTSSOP-20 package

Applications:

  • 5VDC, 12VDC, 24VDC, 12VAC, and 24VAC systems
  • Embedded Systems
  • Industrial Control
  • Automotive Telematics and Body Electronics
  • Point (...)
EVALUATION BOARDS Download
document-generic User guide
149
Description

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 (...)

Features
  • 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
EVALUATION BOARDS Download
document-generic User guide
20
Description

The SIMPLE SWITCHER power module demonstration board is optimized for peak performance and small footprint. The output voltage and fast transient response can be adjusted by replacing the small passive components. The good thermal performance of the power modules is showcased using a 2-layer 1oz (...)

Features
  • Integrated shielded inductor (inside module)
  • VIN = 4.5V to 20V
  • Precision enable UVLO - 6V
  • 1.8V output (output voltage is adjustable by changing 1 or 2 resistors)
  • Operates at full load up to 80 °C ambient at 12V input
  • Efficiency
    • Up to 92% (LMZ14203/LMZ12003)
  • Thermal performance
    • θJA = 20°C/W
    • θJC = 1.9°C/W
EVALUATION BOARDS Download
document-generic User guide
25
Description

The SIMPLE SWITCHER power module evaluation board is optimized for peak performance and increased flexibility. By incorporating additional ceramic and an aluminum filter capacitor, the power module EVAL board demonstrates the low output ripple, fast transient response, and low conducted and radiated (...)

Features
  • Integrated shielded inductor (inside module)
  • VIN = 4.5V to 20V
  • Precision enable UVLO - 4.5V
  • 1.8V output (output voltage is adjustable by changing 1 or 2 resistors)
  • Operates at full load up to 80°C ambient at 12V input
  • Efficiency
    • Up to 92% (LMZ14203/LMZ12003)
  • Thermal performance
    • θJA = 20°C/W
    • θJC = 1.9°C/W
  • Uses 0805 (...)
EVALUATION BOARDS Download
document-generic User guide
149
Description

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 (...)

Features
  • 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

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

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