Makita 5-cell battery pack with 60W USB fast charging, supports same-port charging and discharging.

Important Notes on the Solution                             
: 1. The IP2366 is a 140W charging chip. However, this 140W means it supports a maximum of 140W fast charging protocols. The specific charging power will be determined by the materials and layout of the external step-up/step-down MOSFETs and inductors. Different power ratings result in different circuit costs.
2. The MOSFETs used with the IP2366 cannot be easily replaced. This solution uses a maximum charging power of 60W, and it can only stably pass high-temperature testing with a heatsink. Therefore, applications without a heatsink will be limited to 45W to avoid product risks. The mature implementation of a MOSFET requires careful temperature testing and load testing on a small batch of boards before it can be judged, resulting in a long testing cycle.
 
Reference Circuit
 
 
PCB Layout Diagram
 
PCB 3D Preview Diagram
 
PCB Physical Image
 
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