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Charge voltage battery charger
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hismaimai8888:
Hi all,

I want to ask if there is differences between IC charger in charging voltage.  I've a tried recently an IC LiIon charger with LiPo batteries (BQ2407x series from TI, seems an affidable brand) and found that battery is charged up to 4.11v/4.12v and never up to 4.2v. Also I've read that some battery chargers charge up to 4.27v.
Peabody:
According to the datasheet, the BQ24072 thru BQ24075 charge to a typical 4.2V, with a minimum of 4.16V, but the BQ24079 charges to a typical 4.1V.  Do you perhaps have that one?

SiliconWizard:

--- Quote from: hismaimai8888 on November 13, 2018, 08:48:13 am ---Hi all,

I want to ask if there is differences between IC charger in charging voltage.  I've a tried recently an IC LiIon charger with LiPo batteries (BQ2407x series from TI, seems an affidable brand) and found that battery is charged up to 4.11v/4.12v and never up to 4.2v. Also I've read that some battery chargers charge up to 4.27v.

--- End quote ---

Yes there is. Depends on the exact battery chemistry. There are typically two classes of Li-ion batteries, with max voltage of 4.1V and 4.2V respectively. Most LiPo batteries are 4.2V max, but you have to check. Some chargers made for specific batteries may get a bit higher than 4.2V, but they should usually not be used for just any random Li-ion battery.

The charging circuit should be adapted to the battery - using a charger with 4.2V max voltage with a 4.1V battery may overcharge it. The well designed charger ICs will end up aborting the charge cycle while still in constant current mode as the battery's voltage will never reach 4.2V, but that may not be good for the battery either way.

Some general stuff here (not too bad): https://www.digikey.com/en/articles/techzone/2016/sep/a-designer-guide-fast-lithium-ion-battery-charging
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