BQ24072: Design review BQ24072 and/or BQ24076

Important note: VMODEM = VCC of the all PCB circuit

I received just now, more details about the batteries, from the factory

• The 1000 mAh battery is single-cell polymer
• The 12000 mAh is two cells Polymer,
• The 12800 mAh is 4 cells of LFP .

Thank you

Hi Haim,

The only noticeable problems are the capacitors on the input and the output. The output pin should have a minimum capacitance of 4.7uF. What is the capacitance at the output? Also the input capacitor should be 1uF.

Hi Anthony,

I have the capacitors drawing in MCU page.  Input pin capacitors are 470uF 6.6V and 0.1uF then serial ferrite bead connected to the input pin. Output pin has 470uF on MCU page, not seen on PS page. 

Thank you

Hi Haim,

That should be fine as well. It is on the larger size but I don't see any problem with a larger capacitor aside from the capacitor discharge if you're alright with that on the output. 

Then I can go with the same schematic and same resistor values for 3 different PCB and different batteries, using BQ24072 chipset, 

Pin# 15 to GND, Actually all pin are ok. In case batteries with thermal protection output, I will remove R9 

Thank you very much. After your final confirmation I will check the RESOLVED check bus

Regards

Haim Rodrik

Ah unfortunately, this is a single cell charger so it will only work for one of your batteries. Sorry about that.

For the two cell charger, I can recommend the BQ25886 it's a 2cell that uses USB input.

If you want a device that you can use to charge all of your batteries in 3 different PCB, the BQ24610 could be a possibility from my understanding

Thank you for the links. I check them and look that those BQ series chargers are for multicell but designed for serially connected cells. I checked with the factory and they are saying that those our customized batteries parallel connected. 

So far I approved 1000 mAh battery-operated product, now I must find a solution for the rest of the batteries. 

Thank you