Keep USB power banks alive when powering low-power projectsDesigned by OverZ in United Kingdom
What is it? Ever wanted to power a project from a USB power bank, only to have it keep shutting itself off because the current draw was too low? This handy USB module uses a pulsed constant current...Read More…
Ever wanted to power a project from a USB power bank, only to have it keep shutting itself off because the current draw was too low? This handy USB module uses a pulsed constant current sink to keep the power bank alive, and supports USB 3 pass-through!
The smarts of this device is an ATtiny10 which controls the on and off cycling of the constant current sink, since power banks don't normally need a continuous current to stay on. This pulsing technique drastically improves the battery life of the power bank, perfect for powering a small project for a few weeks. The current is adjustable via a small trim potentiometer from 0mA to 140mA and the supply voltage can be anywhere from 1.8V to 5.5V.
Because it's hella annoying when your USB power bank doesn't want to stay on!
WARNING: Do not connect the keep-alive module between a QuickCharge/Power-Delivery compatible power source and a QC/PD device, as up to 20V could be present on the power lines which will destroy the module.
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Royal Mail: Small packet (EE)
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