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LM25118: LM25118 circuit design

Part Number: LM25118

Dear all:

I met a problem when using LM25118 to design my products! My design schematic shows as below:


The Vin is from 15V Super capacitor, the desired output is 12V after LM25118. As we know LM25118 is a wide voltage range buck-boost controller, and it's minimun Vin can reach 3V. But according to my design, it do not work when the voltage of Super capacitor is lower than 9V! i dont know why? Is there something wrong with my design??? can you show me the correct  LM25118 lower Vin design?

Many thank!!!