I am looking to make a PCB with the battery: https://core-electronics.com.au/polymer-lithium-ion-battery-4400mah.html
charger : https://core-electronics.com.au/adafruit-micro-lipo-w-microusb-jack-usb-liion-lipoly-charger-v1.html
DCDC converter : https://core-electronics.com.au/mini-dc-dc-step-down-buck-converter-5v-at-1a-output-tsr12450.html
All these has to be within the PCB. Do you guys think we can use the extra header holes in the chrger to lay the PCB tracks to make the connections between the battery-charger-DCDC converter?
I think those “extra header holes” are alternative connections used if you don’t want to use the connectors.
What are you using the DC/DC converter for. This is a buck converter which uses a 6.5V to 32V input for 5V output. Since you are planning on using a LI-PO battery I would have thought to get 5V would have required a boost converter.
Welcome to the forum!!
To add to Bob’s reply you can take a look at the pinout here: USB C Pinout | Adafruit MicroLipo and MiniLipo Battery Chargers | Adafruit Learning System
If you provide some more info about what you were trying to do with the PCB we can help out!
Were you trying to use the converter to step down an input voltage so that you can input it into the LiPo charger to then charge the battery?
You could use female JST-RE or Dupont-style connectors on your PCB to connect to breakout boards, however if you are designing the PCBs yourself, you should just use the readily-available schematics of the breakouts as reference diagrams for implementing the chips that the boards break out.
A complete view of your PCB and it’s design goals would really help us in recommending parts!