carp3
Newbie level 6
Hi, how can i build a high efficiency(>90%) voltage converter for converting 5.2~6v (4*AA) to 5v and 3.3v (dual output)? 1mA max, 200µA typical(each output) /non-isolated . any suggestion?
thanks.
thanks.
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I think you mean the LTC3632? That gets pretty close to the OP's requirements, but its efficiency seems to drop off below 1mA. Maybe if it's used to convert to 5V, then a charge pump is used to convert 5V to 3.3V, it could get close to 90%.A few special designed micropower switchers like Linear LTC3652 are going in the asked direction, but most likely not exactly fitting your needs. You can take it as a proof that's not completely impossible to design a buck converter for similar specifications.
What are your ripple voltage requirements on the outputs?
I think you mean the LTC3632? That gets pretty close to the OP's requirements, but its efficiency seems to drop off below 1mA. Maybe if it's used to convert to 5V, then a charge pump is used to convert 5V to 3.3V, it could get close to 90%.
Well this probably makes a buck converter impossible, since most low power bucks get high efficiency by using a burst mode (which means high ripple).up to 0.01v is ok. but frequency should be less than 50khz.