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Hi
BQ24030本身并非设置到4.2V的OUT输出，建议你在其输出4.2V的电压转换电路。
For bq24030/31, Q1 acts as a switch as long as the AC input remains at or below 6 V (VO(OUT-REG)).
Once the AC voltage goes above 6 V, Q1 starts regulating the output voltage at 6 V
