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LM2623: LM2623 12V output problem

Part Number: LM2623

Hello, 

I'll still could not upload the pdf files. 

Here is what we did according to LM2623 datasheet reference design of 5V output.

In our design we need to achieve 12V output. Due to absolute maximum rating of 10V for BOOT, EN and VDD,

we disconnect BOOT,EN and VDD from VOUT (12V), and connect to 5V input, but the output measured is 18V and not 12V.

We then leave VDD and EN connect to 5V input, and connect BOOT to VOUT 12V, we get 12V ouput, but BOOT max rating is 10V.

We then drop VOUT to 10V (by adjusting the resistor's value), it still works fine, and we get 10V ouput.

My question is why BOOT have to connect to VOUT in order to make the circuit work? If so, the BOOT maximum rating is 10V, we will never achieve 12V.

In addition your specs stated output adjustable from .124V to 14V? Could you please advise.

Thanks.

Teck