Low-drift, low-side, bidirectional current sensing circuit with integrated precision gain



The low-side bidirectional current-shunt monitor solution illustrated in the following image can accurately measure currents from –4 A to 4 A, and the design parameters can easily be changed for different current measurement ranges. Current-shunt monitors from the INA21x family have integrated precision gain resistors and a zero-drift architecture that enables current sensing with maximum drops across the shunt as low as 10-mV full-scale.
  • Input: Iin = –4 A / 4 A, Vcm = 12.5 V
  • Output: 0.5 V to 4.5 V
  • Supply: Vs = 5 V, Vref = 2.5 V
Analog current-sense amplifiers
INA181 26-V bi-directional 350-kHz current-sense amplifier INA199 26V, bi-directional current sense amplifier INA214 26V, bi-directional, high-precision current sense amplifier
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Type Title Date
* Circuit design Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) PDF | HTML 02 Dec 2020
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Application note Low-Side Current Shunt Op-Amp Circuit to 3-V Single-Ended ADC for Cost-Optimized (Rev. A) 29 Sep 2021
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
E-book Simplifying Current Sensing (Rev. A) 09 Jan 2020
User guide 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution Design Guide (Rev. B) 11 Dec 2015
Design guide +/-1A Single-Supply Low-Side Current Sensing Solution Design Guide 08 Dec 2014

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