This half-inch square ultra-low power energy harvesting LiPo cell charger by ... configured to charge and maintain a single lithium-polymer cell. The BQ25504 is an integrated part that takes ...
The power packs [Andy] looked at have a TP4221 controlling the charge cycle ... to 5 volts for one or two USB ports while providing automatic shutdown if the LiPo cell voltage drops below 3.2v.
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