What is it?

A tiny (17x12mm) step-up converter board with true shutdown, providing 5V with a current limit of 800mA, great for battery-powered projects.

Features:

• Input voltage range: 2.4-4.5V
• Output voltage: 5V
• Shutdown current: less than 1uA
• Short-circuit protection
• Output thermal protection

Why did you make it?

I'm working on an open-source solar-powered air quality monitor and needed a 5V supply for the PMS7003 air quality sensor. I also needed to be able to switch the sensor off, as it draws a significant amount of current (around 60mA) for a battery-powered project.

What makes it special?

Most boost converters only switch off the boost function itself when they are disabled, still allowing current to flow through to the output via the inductor and the diode. This board uses the FP6277, a synchronous boost converter that completely switches off the power at the output when the enable pin is pulled to ground. This is great for battery-powered projects that uses sensors that need to be switched off when not in use.

With supply chain shortages making it difficult to get hold of even simple components like DC-DC converters, I wanted to design a breakout board around a chip that's easy to source from suppliers like LCSC. At the time of writing (2021-01-07) there are still more than 28 thousand FP6277 chips in stock at LCSC.

Featured in the news!

• Read the feature on Hackster.io!
• Also featured on the Tindie blog!

Usually ships within two days after placing an order.