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LM2662接运放 只能提供到-3V 问题

Other Parts Discussed in Thread: LM2662

大家好,我设计了一个 ADC转换器的前置电路

采用LM2662提供 -5V,供给到AD8138AR这个运放的负电源。

可是上电后, LM2662的+5V 输入没有问题, AD8138的+5V没有问题。 但是 测量 LM2662的-5V输出,只有-3V,

LM2662的负输出负载只有一个AD8138,怎么也无法提供到-5V呢?