CADY Solutions

𝗛𝗼𝘄 𝘁𝗼 𝗗𝗲𝘀𝗶𝗴𝗻 𝗮 𝗦𝘁𝗮𝗯𝗹𝗲 𝗣𝗼𝘄𝗲𝗿 𝗦𝘂𝗽𝗽𝗹𝘆 𝗳𝗼𝗿 𝗬𝗼𝘂𝗿 𝗖𝗶𝗿𝗰𝘂𝗶𝘁

𝗬𝗼𝘂𝗿 𝗰𝗶𝗿𝗰𝘂𝗶𝘁 𝗶𝘀 𝗼𝗻𝗹𝘆 𝗮𝘀 𝗴𝗼𝗼𝗱 𝗮𝘀 𝘆𝗼𝘂𝗿 𝗽𝗼𝘄𝗲𝗿 𝘀𝘂𝗽𝗽𝗹𝘆.

Everything may look perfect…
But unstable power will give you random resets, noise, and unreliable performance.

𝗦𝗼 𝗵𝗼𝘄 𝗱𝗼 𝘆𝗼𝘂 𝗺𝗮𝗸𝗲 𝗶𝘁 𝘀𝘁𝗮𝗯𝗹𝗲?

𝟭. 𝗖𝗵𝗼𝗼𝘀𝗲 𝘁𝗵𝗲 𝗿𝗶𝗴𝗵𝘁 𝗿𝗲𝗴𝘂𝗹𝗮𝘁𝗼𝗿
Use linear regulators for low noise, and switching regulators for efficiency. Always check voltage, current, and heat.

𝟮. 𝗔𝗱𝗱 𝗽𝗿𝗼𝗽𝗲𝗿 𝗳𝗶𝗹𝘁𝗲𝗿𝗶𝗻𝗴
Use input and output capacitors to smooth voltage. Add LC filters if your system is noisy.

𝟯. 𝗨𝘀𝗲 𝘁𝗵𝗲 𝗿𝗶𝗴𝗵𝘁 𝗰𝗮𝗽𝗮𝗰𝗶𝘁𝗼𝗿𝘀

-) 0.1µF (100nF) near each IC for high-frequency noise
-) Bulk capacitors (1µF – 100µF) for stability
Combine values for best results.

𝟰. 𝗛𝗮𝗻𝗱𝗹𝗲 𝗹𝗼𝗮𝗱 𝗰𝗵𝗮𝗻𝗴𝗲𝘀 𝗽𝗿𝗼𝗽𝗲𝗿𝗹𝘆
Your circuit doesn’t draw constant current. When current demand suddenly increases, voltage can drop. Use bulk capacitors and regulators with good transient response to keep the system stable during these changes.

𝟱. 𝗔𝘃𝗼𝗶𝗱 𝗼𝘃𝗲𝗿𝗹𝗼𝗮𝗱𝗶𝗻𝗴 𝘆𝗼𝘂𝗿 𝘀𝘂𝗽𝗽𝗹𝘆
Always design with margin. Don’t run your regulator at its maximum current. Leave headroom (at least 20–30%) to prevent overheating and performance issues.

𝟲. 𝗧𝗵𝗶𝗻𝗸 𝗿𝗲𝗹𝗶𝗮𝗯𝗶𝗹𝗶𝘁𝘆
Add protection, manage heat, and test your circuit under real conditions.

The lesson?

A stable power supply is not luck, it’s intentional design.

In modern electronics design, efficiency often gets all the attention.

With switching regulators everywhere, it’s tempting to think linear regulators are becoming obsolete. But real-world engineering tells a different story.

Linear regulators still play a critical role , not because they’re the most efficient, but because they deliver what many systems truly need: clean, stable, and predictable power.

The best designs aren’t built on efficiency alone. They’re built on understanding trade-offs - and knowing when performance, noise, and reliability matter more.

That’s what separates a working circuit from a truly robust one.

👉 Read the full article to dive deeper into when and why linear regulators still matter.

cadysolutions.com

𝗢𝗻𝗲 𝗰𝗼𝗺𝗺𝗼𝗻 𝗺𝗶𝘀𝘁𝗮𝗸𝗲 𝗶𝗻 𝗵𝗮𝗿𝗱𝘄𝗮𝗿𝗲 𝗱𝗲𝘀𝗶𝗴𝗻 𝗶𝘀 𝗰𝗵𝗼𝗼𝘀𝗶𝗻𝗴 𝗮 𝗿𝗲𝗴𝘂𝗹𝗮𝘁𝗼𝗿 𝘄𝗶𝘁𝗵𝗼𝘂𝘁 𝘁𝗵𝗶𝗻𝗸𝗶𝗻𝗴 𝗮𝗯𝗼𝘂𝘁 𝘁𝗵𝗲 𝘀𝘆𝘀𝘁𝗲𝗺.

Linear regulators are simple and clean.

𝗧𝗵𝗲𝘆 𝗮𝗿𝗲 𝗲𝗮𝘀𝘆 𝘁𝗼 𝘂𝘀𝗲, 𝗹𝗼𝘄 𝗻𝗼𝗶𝘀𝗲, 𝗮𝗻𝗱 𝗴𝗿𝗲𝗮𝘁 𝘄𝗵𝗲𝗻:
• The input-to-output voltage difference is small
• Current demand is low
• Noise-sensitive circuits like sensors, ADCs, or analog stages are involved

𝗧𝗵𝗲 𝗱𝗼𝘄𝗻𝘀𝗶𝗱𝗲? 𝗣𝗼𝗼𝗿 𝗲𝗳𝗳𝗶𝗰𝗶𝗲𝗻𝗰𝘆 𝗮𝗻𝗱 𝗵𝗲𝗮𝘁 𝘄𝗵𝗲𝗻 𝘃𝗼𝗹𝘁𝗮𝗴𝗲 𝗱𝗿𝗼𝗽 𝗼𝗿 𝗰𝘂𝗿𝗿𝗲𝗻𝘁 𝗶𝗻𝗰𝗿𝗲𝗮𝘀𝗲𝘀.

Switching regulators, on the other hand, are built for efficiency.

𝗧𝗵𝗲𝘆 𝗮𝗿𝗲 𝗯𝗲𝘀𝘁 𝘄𝗵𝗲𝗻:
• There is a large voltage difference
• The load current is high
• Power efficiency and battery life matter

𝗧𝗵𝗲 𝘁𝗿𝗮𝗱𝗲-𝗼𝗳𝗳 𝗶𝘀 𝗵𝗶𝗴𝗵𝗲𝗿 𝗰𝗼𝗺𝗽𝗹𝗲𝘅𝗶𝘁𝘆, 𝘀𝘄𝗶𝘁𝗰𝗵𝗶𝗻𝗴 𝗻𝗼𝗶𝘀𝗲, 𝗮𝗻𝗱 𝗺𝗼𝗿𝗲 𝗰𝗮𝗿𝗲𝗳𝘂𝗹 𝗣𝗖𝗕 𝗹𝗮𝘆𝗼𝘂𝘁.

𝗧𝗵𝗲𝗿𝗲’𝘀 𝗻𝗼 “𝗯𝗲𝘁𝘁𝗲𝗿” 𝗼𝗽𝘁𝗶𝗼𝗻 𝗼𝗻𝗹𝘆 𝘁𝗵𝗲 𝗿𝗶𝗴𝗵𝘁 𝗰𝗵𝗼𝗶𝗰𝗲 𝗳𝗼𝗿 𝘁𝗵𝗲 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻.
𝗚𝗼𝗼𝗱 𝗵𝗮𝗿𝗱𝘄𝗮𝗿𝗲 𝗱𝗲𝘀𝗶𝗴𝗻 𝗶𝘀 𝗮𝗯𝗼𝘂𝘁 𝘂𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱𝗶𝗻𝗴 𝘁𝗿𝗮𝗱𝗲-𝗼𝗳𝗳𝘀, 𝗻𝗼𝘁 𝗺𝗲𝗺𝗼𝗿𝗶𝘇𝗶𝗻𝗴 𝗽𝗮𝗿𝘁𝘀.

What has been your experience choosing between linear and switching regulators in your designs?