CIRCUIT060033

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

CIRCUIT060033

Overview

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.
Features
  • 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
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Technical documentation

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Type Title Date
E-book An Engineer's Guide to Current Sensing (Rev. B) Apr 12, 2022
Application note Low-Side Current Shunt Op-Amp Circuit to 3-V Single-Ended ADC for Cost-Optimized (Rev. A) Sep 29, 2021
Selection guide Current Sense Amplifiers (Rev. E) Sep 20, 2021
Circuit design Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) PDF | HTML Dec 2, 2020
User guide 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution Design Guide (Rev. B) Dec 11, 2015
Design guide +/-1A Single-Supply Low-Side Current Sensing Solution Design Guide Dec 8, 2014

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