3.3v convert 5v and vice versa

[mikemikemike]

any IC can do this?
any schematic can provide to me?
THXs

 

[crust]

At low currents there is probably a "charge pump" IC to do this, at higher currents you would need to build a DC-DC boost converter. The Maxim MAX1672 can do this at 300 or so mA. It is in a tiny package, but I am sure they have others parts in different packages.

 

[Roff]

Do you want to convert DC voltages (power supplies), or simply to convert between logic levels?

 

[mikemikemike]

For Power supply,

actually, 5V to 3.3V

 

[Exo]

I would use an LM317 setup to give 3.3V

Or make a voltage divider with resistors and add a emittor-follower (only good if input voltage is stable at 5V)

Don't have any scematics handy right now... Maybe i'll find something to post later