To provide 35V and 1mA load, which structure should I choose

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mastericke

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If I choose charge pump structure with a input voltage about 5V, the effiency will be very low and the Iq of my chip can be several mA large; And if I use boost, because the load is so light, so I also can not get a good effiency?

Can somebody provide a solution on this ? Need your help.
 

Maybe a regular small transformer with ratio about 5:35 would provide greater effiency that other solution, since transformers usually do have just "little" power loss.
But then the effiency of the driver stage would be very important.
 

You're apparently referring to IC design, so charge pump is the only technique applicable without external components.
You surely know, that it's widely used for chip internal EEPROM cell supply. If external inductive components are
an option, low quiscent current, high efficiency boost converters are possible though. They are available from major vendors.
 

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