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


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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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Part Number Buy from Texas Instruments or Third Party Buy from authorized distributors Status

Order the full kit of parts to build and utilize this reference design. The kit includes all TI devices, blank PCB, and all related passive and connector content

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TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

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  50V Input, 50mA, Single Output Low-Dropout Linear Regulator  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents
User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 976 03 Oct 2013 445
Design files (3)
Title Abstract Type Size (KB) Date Views
PDF 188 03 Oct 2013 87
PDF 144 03 Oct 2013 259
ZIP 680 03 Oct 2013 38
Related Tools & Software

Software (3)

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