low voltage 3V Battery Charger IC fabrication difficiulties

[B_smith]

I am wondering why there is no many fabricated battery chargers ICs published, I can guess there are some difficulties with the low voltage battery charger IC fabrication, can anyone tell this right or not ??

thanks in advance

 

[mtwieg]

Probably because there isn't much demand for such chargers, at least compared to chargers for 3.7-4.2V Li-ion and Li-poly batteries. Most 3V cells are intended for very long life, low power applications where charging isn't really needed, or is done with trivial circuitry. As far as I know there aren't any difficulties with the lower voltages. Nowadays people are fabricating power conversion systems on 1.8V CMOS processes, of all things.

 

[tpetar]

I am wondering why there is no many fabricated battery chargers ICs published, I can guess there are some difficulties with the low voltage battery charger IC fabrication, can anyone tell this right or not ??

thanks in advance

There is lots existing solutions and dedicated IC for this purpose, nothing new spectacular cannt be shown, except price of that IC or product. There is no problems with low voltage uC, Lithium based bat cover all of that, but there is problems with other design parts which needs higher voltages. Lowest bat voltage is 1,2V NiMh and you have lots of solutions and IC for this.

I use Li-Po phone bat for many tiny projects, and Li-Ion 18650 for other projects with more power needs. Often I use and need voltage booster from Li voltage to 5V.