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LM27762: LM27762正电压输出异常

Part Number: LM27762

目标是搭建±2.5v电源,电路图如下,out-输出正常,为2.49v,而out+输出为3.90v。

测量各个引脚电平,结果如下:

VIN=4.92v
CP=-4.76v
OUT-=-2.49v
FB-=-1.22v
OUT+=3.90v
FB+=1.84v

另外,我将VIN降低到4.08v,此时OUT-输出依然为-2.49v,但OUT+输出降低到2.98v,似乎LDO没有正常工作。

附上PCB图如下:

9b2473d11d58379af505397a8f7899d3.png