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TI的一款DC/DC芯片TPS62170系列容易烧坏

Other Parts Discussed in Thread: TPS62170

TI的一款DC/DC芯片TPS62170系列,我用它12V转4.5V然后再加一个同样的芯片4.5V转3.3V。前面的芯片很容易烧坏导致电路短路,有时候电容被击穿短路。但是他后面的4.5V转3.3V就没问题。请教是哪里出问题了?还有这款芯片的输入与输出的压差范围是多少?在规格书上没有提到。