ip2312 synchronous step-down lithium battery charging module

Use buck synchronous step-down high-power lithium battery charger, low heat generation and high efficiency.
You can add the battery type selection resistor by yourself. This file does not select the resistor. The default battery is 4.2V. The
main filter capacitor has been updated. The package is 1206. The component table has been updated. , the resistor 0805 package pad is a 104 capacitor, the 1206 package is a 106/226 capacitor, if it is less than 1A, you can use a 106 capacitor, a large current of 106 will have a large ripple, the inductor value is 4R7, the specific component selection is mainly based on the specifications. It's accurate. When I drew the schematic diagram, I referred to the package. The automatically generated table is definitely wrong. The component values ​​are shown on the schematic diagram. I will edit the details later, but there will inevitably be some problems. If you are not sure, you can go to the comment area and ask about
the load time. If it exceeds 2A, it is best to take heat dissipation measures. You can drill a few gnd vias under the chip to assist (this is not done for convenience of soldering, and it is not very hot when the load is no more than 2A during the test), or other heat dissipation measures, the inductor will also heat up.
Test photo
ip2312 drive waveform, the load is about 2A.
After setting the 3A output amplification,
it is recommended that if the load is high, use a 226 filter capacitor around 2A, and a 106 filter capacitor
106 can be used around 1A. If there is a large ripple in the 2A state
, if the schematic diagram appears The problem prompted when importing pcb is most likely a bug. The import problem has been verified at the time of release. At present, the schematic diagram does not correspond to the pcb component after being clicked. You need to use the component tag number to search.
2023/2/2 Updated part of the layout and improved the wiring. , improve the efficiency of the input capacitor and reduce the PCB area