DC -> DC

hi all,

I have some questions regarding information I recieved. I have an external
source which delivers my PCB with 10V DC. I need 3 DC voltages: 3.3, 1.8 and
1.5V . The person suggested to use a 'switched mode convertor' to bring the
voltage to 3.3 V and use 2 'lineair convertors' to get the 1.8 and 1.5V .

I have some questions. Is this the way you guys would get the 3 DC
voltages.. IF so, an internet search has not given me enough information
regarding the SMC or LC. Maybe someone can point me a manufactor that
produces these things?

kind regards
Stijn

 

Hi Stijn,

If it is higher current (more than a few hudred mA) you can use "buck
converters". Check the "simple switcher" series from National for an easy
solution. I think Texas even has converters with te inductors and all in there.

Low currents can be done with the usual linear regulators. Or a mix if, for
example, only your 3.3V is high current.

Regards, Joerg

 

Suggest you try Maxim for a start, they have plenty of IC's which will do
this, although I can't recall offhand whether they do it in one chip or not
(I think they do). Look at:
http://para.maxim-ic.com/PowerSupplies.htm
they have data sheets and application notes on-line. National Semiconductor
are also worth a look.

Ken