LINEAR Application Note 113
Summary
Master this highly efficient JFET-based DC/DC converter designed for ultra-low voltage power sources (0.3V minimum). This comprehensive application note provides an in-depth look at building a regulator that reliably boosts meager inputs—such as those from solar cells or fuel cells—up to a stable 5V output. The documentation covers the core circuit topology, detailed operational waveforms, and how sophisticated internal control loops ensure consistent energy conversion, making it essential for embedded systems engineers working on low-power, start-up constrained designs.
Manual Details
| Brand | Linear |
|---|---|
| Pages | 20 |
| File Size | 675.55 KB |
| Published | June 03, 2026 |
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Frequently Asked Questions
What is the minimum input voltage for this converter?
The circuit can operate from as little as 0.3V.
How does the system regulate the output voltage?
Regulation is maintained by C1’s switched output controlling Q1’s on-time via Q3, which regulates current through a control loop.
What specific function do solid-state components like solar cells fulfill?
These low-power sources (like solar or thermopile cells) can power the circuit from 0.3V to 1.6V input.
Does the output stabilize if more current is needed?
Yes, increased load (current demand) causes C1’s switched output to enforce regulation by initiating a control loop.