My battery charger board design, any comment?

[Porama6400]

Hi,

I am currently trying to design my own battery charger/protector circuit.
I am not an Electronic Engineer, and I am not quite sure what am I doing.

so any comment on my abomination of a board would be appreciated,
I would love to improve my board designing skill

Thank you

[Peabody]

Will you be charging the battery and powering the load at the same time?  If so, will the maximum load current be less than the charger's termination current so charging will terminate properly?  Here's  an app note with information on this problem - see Figure 5.

http://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf

[Porama6400]

Will you be charging the battery and powering the load at the same time?  If so, will the maximum load current be less than the charger's termination current so charging will terminate properly?  Here's  an app note with information on this problem - see Figure 5.

http://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf

Thanks, I totally forgot about that.

I didn't planned with charging while powering load in my mind, but I suppose that's something I should implement.

[gnuarm]

You asked for comments, so non-positive comments are included I suppose.  Not trying to be mean, but I can't read your schematics.  You leave 90% of each page empty, spreading a 1 page design over three pages.  Rather than connect points with wires, you give each pin on every component a net name which the reader has to search for to find the connections. 

The primary difference between a net list and a schematic is that the schematic is supposed to be graphical showing connections with lines representing wires.  Loose that and it becomes just a net list.

I can't tell exactly what the design is doing.  I would need to pull up the reference design on the data sheets to figure that out.  Should I assume this is charging Li-ion batteries?  How many cells/what voltage?  What capacity?

[Porama6400]

You asked for comments, so non-positive comments are included I suppose.  Not trying to be mean, but I can't read your schematics.  You leave 90% of each page empty, spreading a 1 page design over three pages.  Rather than connect points with wires, you give each pin on every component a net name which the reader has to search for to find the connections. 

The primary difference between a net list and a schematic is that the schematic is supposed to be graphical showing connections with lines representing wires.  Loose that and it becomes just a net list.

I can't tell exactly what the design is doing.  I would need to pull up the reference design on the data sheets to figure that out.  Should I assume this is charging Li-ion batteries?  How many cells/what voltage?  What capacity?

Thanks,
non-positive comment is crucial for learning process I suppose, I really appreciated it

Which part of the schematic do I suppose to put those specs (voltage, cell, charge current) in?

[gnuarm]

You could show the battery connection clearly and note it there.  Admittedly I didn't spend a lot of time trying to dig into the design.  My eyesight is poor so I have to blow up text to read it.  With the design spread out so much I had to keep panning around to try to figure out the design. 

I looked at it a bit more and I guess I'd need to read the data sheets as some of this is not at all obvious to me.  Are you sure the two FETs are connected correctly?  They are usually source to source, not drain to drain. 

I did figure out where the battery is connected, VCELL_P AND VCELL_N connecting at J5.  Can't say I understand what J4 is for.