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.
1. What is the difference between 5091/5092
2. What is your recommendation?
You could save some time by ordering our evaluation boards if you'd like.
ADP5091/ADP5092: EVAL-ADP509X Evaluation Board | Analog Devices
LTC3331: DC2151A Evaluation Board | Analog Devices
Right, not all of the information is in the parametric search. You can usually tell from the "features" list on the front page of the datasheet (but I know that's a few extra clicks for each IC).
LTC3106 will charge Li-Ion batteries. Looks like you found all the right ones except that LTC3330 does not charge batteries (it is essentially the same as LTC3331 but includes an integrated LDO instead of a battery charger circuit).