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Best LI Ion Battery and Solar and System Power

I am trying to figure out the best IC for a small IoT that can

1. Solar Energy Harvest

2. Charge a single cell Lithium Ion 4.2v

3. Provide a 3.3v regulated power supply

My system will be small <20mA ... and very very periodic a sensor + a BLE beacon

Seems like ADP5091/5092 or LTC4121-4.2 or LTC3331 all fit the bill.


I was originally planning to use a 1 watt 6v solar cell.. though I could use something smaller.


My questions

1. What is the difference between 5091/5092

2.  What is your recommendation?




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