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充电部分的原理图如上图所示，输入电压DC12V, VBAT接一个5000mAh的一个锂电池，充电的预设电流为2A, 但接上锂电池充电（3.3V）实际上充电电流只有1A,怎么样都上不去，麻烦各位大神帮忙看一下，我这个充电电流上不去是啥原因？
我这边输入电压VBUS:DC12V, 电池充电电压VBAT:空载时4.0V,带电池充电时4.18,电池充满能到4.2V。VSYS输出电压4.5V，VSYS负载端空载，输出电流为0.
