PCB layout for USB Power Bank

Hello, A quick word on the charger specs: They work by boosting the voltage and require both Qualcomm and UL certifications. If you are planning on a single-cell power bank, you will have to boost the power, anyway, and that is very inefficient. You are better off with a multi-cell pack that you can switch down. The reason is boosting requires more current than your output, and at 2A output, that is 4A (+ inefficencies). It also requires you to acuire high-C batteries, which could be cheaper to just use 5x1000 mAH than 1x5000 mAH. I would suggest you just provide a standard 5V charging outputs capable of 1~2A. Use your own (standard industrial) ultra-quick-charge scheme on the power bank. They can always use the power bank as an auxiliary battery. Are you also looking for a finished prototype board you can test? Best regards, Stuart Borden.

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