LMP8646 -2 to 76V, configurable gain and bandwidth, high-speed current limiter | TI.com

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

-2 to 76V, configurable gain and bandwidth, high-speed current limiter - LMP8646


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.


  • 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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LMP8646 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A ≤ 100 
2.7 ≤ 
V ≤ 12
-2 ≤ 
V ≤ 76
-40 ≤ 
C ≤ 125


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Part number Order Common mode voltage (Max) (V) Common mode voltage (Min) (V) Input offset (+/-) (Max) (uV) Input offset drift (+/-) (Typ) (uV/C) Gain (V/V) Gain error (%) Gain error drift (+/-) (Max) (ppm/°C) CMRR (Min) (dB) Bandwidth (kHz) Supply voltage (Max) (V) Supply voltage (Min) (V) Iq (Max) (mA) Number of channels (#) Comparators (#) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LMP8646 Order now 76     -2     1000     4     Adjustable     2     140     55     35     12     2.7     3.11     1     0     Low-side Capable
Programmable Gain    
Catalog     -40 to 125     SOT-23-THIN | 6     6SOT-23-THIN: 5 mm2: 1.6 x 2.9 (SOT-23-THIN | 6)