0-1A, Single-Supply, Low-Side, Current Sensing Solution


Design files


This TI Verified Design implements a single-supply, low-side current sensing solution that can accurately detect load current from 0-1A.  The corresponding linear output range is from 0V to 4.9V. This design relies on the LM7705 inverting charge pump to bias the negative supply of the OPA320 to -0.23V. This setup extends the linear output range of the amplifier below 0V.  The circuit's linear operation across the entire 0-1A input range enables calibrated performance to within ±0.003% error.

  • 0 - 1 A Current Sense
  • 0 to 4.9 V Output
  • Single-Supply Solution
  • ±0.003% FSR Error (calibrated)
  • ±0.0002% Zero Scale Error (calibrated)
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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.

TIDC039.ZIP (759 K)

Detailed schematic diagram for design layout and components

TIDR323.PDF (76 K)

Detailed schematic diagram for design layout and components

TIDR324.PDF (75 K)

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

TIDC226.ZIP (266 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Charge pumps (inductorless)

LM7705Low Noise Negative Bias Generator

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA320Precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* User guide 0-A to 1-A Single-Supply Low-Side Current-Sensing Solution Design Guide (Rev. B) Dec. 11, 2015

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