bq25070这种带USB没有I2C接口,不过可以支持两三个电池的芯片
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输入电压足够的情况下,只针对2-3节磷酸铁锂电池充电,建议你考虑BQ24620这颗针对高串磷酸铁锂电池开发的buck结构充电器。谢谢!