I am working on a zigbee wireless remote. MCU datasheet says it operates in wide voltage range of 1.8 to 3.8 volts.
Besides zigbee MCU, there will be a few LEDs and tact switches (fairly simple and straight-forward circuit).
I am leaning towards using a li-po cell in my design. (previous thought was a CR3032 coin cell but moved to li-po for higher capacity and to make it easily rechargeable by any mobile phone usb-c charger. Rechargeable battery appeared to be more user-friendly.).
Are there any major draw-backs in terms of safety and product life just because a li-po cell is present? I am targeting a product life of 5 years or more. Remote will have to be charged every 6 months or so.
Below is the discharge profile of a li-po cell:
The usable capacity of the cell lies in a voltage range of 4.2 volts to 3.6 volts. As such, how do I make the most of it? What kind of voltage regulator will give me best efficiency? Should I just do away with a regular diode? 0.7 V drop keeps me in fairly safe zone.
At full charge, I get 3.5 V and at low charge (3.6 V cut-off), I get 2.9 V. These are very comfortable voltages for my zigbee MCU.