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


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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Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM7705  Low Noise Negative Bias Generator  DC/DC switching regulators  Sample & Buy View Design Kits & Evaluation Modules
OPA320  Precision, Zero-Crossover, 20MHz, 0.9pA Ib, RRIO, CMOS Operational Amplifier ;  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM7705 Download Download
OPA320 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 941 11 Dec 2015
Design files (4)
Title Type Size (KB) Date
ZIP 266 09 Jan 2014
PDF 75 08 Jan 2014
PDF 76 08 Jan 2014
ZIP 759 08 Jan 2014
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Software development (2)

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