Solar Power Energy Harvester Reference Design Using a Super Cap


Design files


This reference design is a solar charger and energy harvester using a highly integrated power management solution that is well-suited for ultra-low power applications. The product is specifically designed to efficiently acquire and manage the microwatts (μW) to milliwatts (mW) needed to power your design. The storage method is a 47nF super capacitor that is charged and maintained by 4 series low power solar elements using  MPPT (maximum power point tracking) .

  • MPPT (maximum power point tracking) provides optimal energy extraction from solar panels
  • Internal battery charging and protection cicruits
  • Input voltage regulation prevents collapsing high impedance input sources (boost)
  • Programmable step-down regulated output (buck)
  • Energy is stored in a super capacitor, for use in a low power application
  • This design is a complete solution, including the solar current source, charge management solution, super cap and a built-in LDO regulator
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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.

TIDU382.PDF (417 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDR723.PDF (144 K)

Detailed schematic diagram for design layout and components

TIDR724.PDF (61 K)

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

TIDR726.ZIP (1322 K)

Files used for 3D models or 2D drawings of IC components

TIDC465.ZIP (1322 K)

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

TIDR725.PDF (308 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ25570Ultra Low power Harvester power Management IC with boost charger, and Nanopower Buck Converter

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
User guide IXOLAR High Efficiency SolarBIT (TIDA-00242) Jun. 05, 2014
Test report TIDA-00242 Test Results Jun. 05, 2014

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