±1A Single-Supply Low-Side Current Sensing Solution Reference Design


Design files


This single-supply low-side, bi-directional current sensing solution can accurately detect load currents from -1 A to 1 A. The linear range of the output is from 110 mV to 3.19 V. The design utilizes the OPA2313 configured as a difference amplifier and reference voltage buffer.

  • ±1A Low-side Current Sensing Solution
  • Less than 1% total unadjusted error
  • Supply: 3.3V
  • Output: 110mV to 3.19V
  • This robust circuit reference design includes theory, complete error analysis, component selection, simulation, PCB design, and measured data that correlates with the theory and simulation

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU675.PDF (723 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components

TIDRG85.PDF (103 K)

Detailed schematic diagram for design layout and components

TIDRG86.PDF (70 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

General-purpose op amps

OPA2313Dual, 5.5-V, 1-MHz, low quiescent current (50-μA), RRIO operational amplifier

Data sheet document-pdfAcrobat PDF

Technical documentation

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Type Title Date
* Design guide +/-1A Single-Supply Low-Side Current Sensing Solution Design Guide Dec. 08, 2014

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