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TPS61030低电压升压时,负载电流不够怎么解决?

Other Parts Discussed in Thread: TPS61031, TPS61032, TPS61030

各路大神,小弟遇到问题了,帮忙看一下,谢谢喽!

输入电压VBAT在1.8v~2.2V之间,输出Vcc想调整在3.8V左右,具体电路在下面附件中。看tps6103x手册中第6页TPS61031和TPS61032的MAX OUTPUT CURRENT vs  INPUT VOLTAGE ,想Vcc输出在3.8V是,最大输出电流应该能1A~1.5A之间,可是实际测量时,外接30Ω纯阻性负载输出电压就讲到2.4V左右。这是什么原因呢,该如何改进呢?