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TPS54327: 同步buck输出负压的问题

Part Number: TPS54327
Other Parts Discussed in Thread: TPS62150

buck输出负压,我看ti给过异步buck输出负压的设计实例,我用同步buck输出负压,电压可以正常输出。但是在效率方面,在10V输入,-7V、0.24A输出时,效率只有67%,并且电感损耗远高于芯片,根据电感损耗I2R计算,电感损耗不应该这么大。请问同步buck和异步buck输出负压的区别是什么,为什么常用异步buck输出负压而不是同步。