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how to make an internal regulator using restricted devices?

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kkkhunter

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The external supply voltage varies from 10 volts to several hundreds volts in different apllication. There need to be an internal regulator as the internal ciucuits supply. The output target of the regulator is 5 volts. But the process only provide 40/40(VGS/VDS) N/P MOS and 10/250 LDNMOS. So how to make the regulator (incluing reference and OP at least)?
Can I use the 40/40 MOS to connect the external several hundreds volts supply?
Or I should use the LDNMOS to make an OP and reference?
Or I can use all the devices in OP and reference? but how?

waiting for your help, guys!
Thanks
 

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