Simple review of the LFP charger with MCU

[anso-engineer]

Hello, I am learning schematic/PCB design, so maybe there will be rude errors both at the schematic level and in the PCB routing.
I tried to follow the datasheets and my imagination, but everything can happen:




If you suddenly find there something unexpected, please let me know.

[Whales]

Some thoughts & suggestions:

1. Your pads for BAT+- are quite small, they will be very difficult to solder wires onto.  I would go big (5x5mm min), you have lots of board space.

2. What current level do you intend for the battery to be charged at?  Your traces for the main current path are very thin (probably only good for a few hundred mA) but the TP5000 charger chip that can do whole amps.

3. It looks like the TP5000 datasheet does not show or talk about PCB layout   Usually this is very important.  The datasheet does include a photo of an example circuit, but that is not much.   At a minimum you want the high current path inductors and high current path capacitors to be as close to the chip as possible, with thick traces for these paths.

4. Consider using GND plane pours on both sides, stitched together with vias.  This may help avoid some circuit misbehaviours caused by unexpected ground voltages.

5. Please attach images here on the forum, rather than hosting them offsite.  Offsite hosting dies after a few years and people will be unable to read or learn from your topic any more.  Also your schematic picture seems very small and blurry (maybe ibb.co resized it?).


Aside: For your first board design I might suggest you use a simple linear charger IC that is limited to a few hundred mA and has a lot less parts, such as the TP4056.   Your TPS5000 is a big switchmode 2A charger with a Chinese datasheet and lots of supporting parts.  There are more things that can go wrong with more complicated designs.

[anso-engineer]

Too much notes, Thanks!
After your review I feel I am close to fail more than I thought 
I  attached the datasheet there was example of PCB layout.

[anso-engineer]

2. What current level do you intend for the battery to be charged at?  Your traces for the main current path are very thin (probably only good for a few hundred mA) but the TP5000 charger chip that can do whole amps.

I intend to use it for 1,5 Amps. I made power line thicker up to 0.5mm.

Aside: For your first board design I might suggest you use a simple linear charger IC that is limited to a few hundred mA and has a lot less parts, such as the TP4056.   Your TPS5000 is a big switchmode 2A charger with a Chinese datasheet and lots of supporting parts.  There are more things that can go wrong with more complicated designs.

I inteded on usage TP5000 because I plan to work with LFP batteries and current more than 1A. Maybe for simplicity purposes I should divide this board on two?
Where will be on MCU board and one for charging? And in the end connect them together with the wires?

[anso-engineer]

3. It looks like the TP5000 datasheet does not show or talk about PCB layout

Found this one:
http://toppwr.com/eproduct/view.php?id=8

Why on the bottom side there is no cooper plate for a heating dissipation?

At a minimum you want the high current path inductors and high current path capacitors to be as close to the chip as possible, with thick traces for these paths.

I simplify design, there will be only TP5000, additional shunt and connections for the MCU. Post it again when finish.
For the thick traces is enough 0.5mm?