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5vdc power supply with minimum component

Hi,

I have design that need 7-30vdc input from external source and i need this range to be converted into 5vdc which will supply to my controller. And i need this to be done in small space I have tried linear regulator IC for this but power dissipation is too much to put heatsink to control heating problem.my design current requirement is 200mA. Can anybody suggest any solution for this?

Thank you. Best regards.