help with regulator selection

B

budgie

Guest
To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple 3-terminal
LDO reg that will drop 5v to 3v3 at up to 2A?

TIA
 
atec wrote:

budgie wrote:

To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple
3-terminal
LDO reg that will drop 5v to 3v3 at up to 2A?

TIA


I might have suggested the lm series 2651 which obviously has to many
legs :_) and runs a max of about 1.5 amps ..

http://www.discovercircuits.com/V/volt-reg.htm
Click to expand...
 
budgie wrote:
To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple 3-terminal
LDO reg that will drop 5v to 3v3 at up to 2A?

TIA
Click to expand...
TS1085CZ-3.3 (Taiwan Semiconductor)
1.4V dropout @ 3A
TO-220 3.3V output
Farnell 720-8286 $11.63
SMD version too.

Alternatively the LT1085 is a 3A adjustable output device in TO-220,
but double the price.

Dave :)
 
On Mon, 05 Dec 2005 16:51:49 +1000, atec <atec77@##hotmail.com> wrote:

atec wrote:

budgie wrote:

To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple
3-terminal
LDO reg that will drop 5v to 3v3 at up to 2A?

TIA


I might have suggested the lm series 2651 which obviously has to many
legs :_) and runs a max of about 1.5 amps ..

http://www.discovercircuits.com/V/volt-reg.htm
Click to expand...
Maybe I'm a tad slow, but having read all the descriptions there I didn't see
anything that met the "specs". If you saw one for the job, can you point me at
it please?
 
"budgie"
To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple
3-terminal
LDO reg that will drop 5v to 3v3 at up to 2A?
Click to expand...

** The LDO requirement makes the job hard.

How low is that darn 5 volt rail gonna fall ??




.......... Phil
 
David L. Jones wrote:

budgie wrote:
To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple
3-terminal LDO reg that will drop 5v to 3v3 at up to 2A?

TIA

TS1085CZ-3.3 (Taiwan Semiconductor)
1.4V dropout @ 3A
TO-220 3.3V output
Farnell 720-8286 $11.63
SMD version too.

Alternatively the LT1085 is a 3A adjustable output device in TO-220,
but double the price.

Dave :)
Click to expand...
National Semiconductor LM1085 / LM1084 might be usable too and are much
cheaper than LT. Those are also in Farnell at least in the UK and probably
in Australia too. I trust the LT part to stay stable under a wider range
of conditions - the LM part has some worrying comments about capacitor ESR
in the datasheet. It could be a trade-off between low price and a bit of
tweaking vs. circuit working reliably first time at a higher price.

Chris
 
budgie wrote:

To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple 3-terminal
LDO reg that will drop 5v to 3v3 at up to 2A?

TIA


I might have suggested the lm series 2651 which obviously has to many
Click to expand...
legs :_) and runs a max of about 1.5 amps ..
 
budgie wrote:

On Mon, 05 Dec 2005 16:51:49 +1000, atec <atec77@##hotmail.com> wrote:



atec wrote:



budgie wrote:



To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple
3-terminal
LDO reg that will drop 5v to 3v3 at up to 2A?

TIA




I might have suggested the lm series 2651 which obviously has to many
legs :_) and runs a max of about 1.5 amps ..



http://www.discovercircuits.com/V/volt-reg.htm



Maybe I'm a tad slow, but having read all the descriptions there I didn't see
anything that met the "specs". If you saw one for the job, can you point me at
it please?


there isn't really a 3 leg that will far as I know , but there are
Click to expand...
several solutions on the page that might get close dependant on the 5v
rail drop .
 
On Mon, 05 Dec 2005 21:19:35 +1000, atec <atec77@##hotmail.com> wrote:

budgie wrote:

On Mon, 05 Dec 2005 16:51:49 +1000, atec <atec77@##hotmail.com> wrote:



atec wrote:



budgie wrote:



To save me scouring hordes of websites while currently suffering a 33.6
connection, does anyone know off the top of their head of a simple
3-terminal
LDO reg that will drop 5v to 3v3 at up to 2A?

TIA




I might have suggested the lm series 2651 which obviously has to many
legs :_) and runs a max of about 1.5 amps ..



http://www.discovercircuits.com/V/volt-reg.htm



Maybe I'm a tad slow, but having read all the descriptions there I didn't see
anything that met the "specs". If you saw one for the job, can you point me at
it please?


there isn't really a 3 leg that will far as I know , but there are
several solutions on the page that might get close dependant on the 5v
rail drop .
Click to expand...
No wonder, I was looking there for a drop-in 3-legged beastie.

The 5V is stiff as, good for 20A+. Droop is not an option.

I know there are manufacturers of *very* LDO units for lower currents, but
haven't needed the higher capability until now.
 
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