10uA-100mA, 0.05% Error, High-Side Current Sensing Solution Reference Design
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Key Document


This TI Precision Verified Design provides the theory, component selection, simulation, complete PCB schematic and layout, bill of materials, and measured performance of a split-supply, high-side four decade current sensing solution that can accurately detect load currents from 10uA-100mA. The corresponding linear output is from 10mV to 4.9V which enables measurement by common 5V ADCs. The design utilizes the PGA281, an instrumentation amplifier with pin-programmable gain and a wide common-mode voltage range, to provide a more accurate and versatile solution than traditional op amps.

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  • High-Side, Four Decade, Bi-directional, Current Sensing Verified Solution
  • Senses Current from 10uA-100mA with <0.05% Error
  • Supports up to ±12.5V Common-mode Input Range
  • 10mV to 4.9V output for measurement by common 5V ADCs
  • Utilizes PGA281 pin-programmable gain instrumentation amplifier to achieve four decade current measurement


    This Verified Design Includes:

  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options


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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
PGA281  Zero-Drift, High Voltage Programmable Gain Amplifier  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS7A4101  50-mA, 50-V, low-IQ, adjustable low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
PGA281 Download Download
TPS7A4101 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 976 03 Oct 2013
Design files (4)
Title Type Size (KB) Date
PDF 188 03 Oct 2013
PDF 144 03 Oct 2013
ZIP 680 03 Oct 2013
ZIP 3467 03 Oct 2013
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