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请推荐一款+5V转-3.3V电源芯片，负载电流1.5A，纹波低于30mV.
可以看一下我们的LMZ34002。或自己用TPS62130，用以下的方式来实现。
Using the TPS6215x in an Inverting Buck-Boost Topology.. (Rev. C) (slva469c.pdf)http://www.ti.com/litv/pdf/slva469c
XL4003可以5V转3.3V，驱动能力强，可以输出4A电流。纹波30mV
