What kind of answer do you expect when you provide so little information? Do you think a serious answer is even possible?
What is the input voltage and power?
What is the output voltage and power?
Are these rquirements within the capability of the chip?
Have you searched the manufactureres website for application notes?
Do you think the design will require an external switch?
Will the inductor be off the shelf or custom?
Is the use of an alternative converter possible?