I am working on a small, solar-powered application that makes use of RF and a few higher-power sensors. Those will only be on for a fraction of the time, but might consume 1A-2A at 3.3V.
The remainder of the time, a low-power micro-controller will be doing house-keeping, monitoring the charge of a super-capacitor, and enabling the high-power load when enough charge is available (and some other criteria are met).
I have been working with the LTC3108 on this, but this has a current limit of 300 mA, which now proves to be a problem.
Do you have recommendations for other parts, or a combination of parts, that would allow me to tackle this?
- controllable 3.3V output 1A-2A (only briefly used)
- input from solar cell (e.g. 1.5V, 26 mA peak - but could be changed)
- always-on 2.2V or 3.3V output for low-power μC
- a super-capacitor that stores the harvested energy (e.g. 2F 5V - but could be changed)