[sdiy] 5 V rail, 3.3 V chips

[Ullrich Peter]

Hi!

3.3V out of 5V is no problem as long as you read the datasheet recommendation.
Most Low Dropout Regulators need minimum output capacitors (some LDO also input capacitors).

But not all. I am planning to use an LDO that doesn't need capacitors on the output in most cases 
and works down to typical 75mV dropout voltage only!
It is the TPS73601 from Texas Instruments...

But for your 1.7V dropout voltage a standard LDO would be fine enough...

Ciao
Peter

http://www.ullrich.at.tt


-----Ursprüngliche Nachricht-----
Von: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von Andre Majorel
Gesendet: Mittwoch, 05. September 2012 09:15
An: synth-diy at dropmix.xs4all.nl
Betreff: [sdiy] 5 V rail, 3.3 V chips

A lot of logic these days needs a 3.3 V rail. How does that work with +5 V power supplies like MOTM and eurorack ? Do you just use a MAX1615 / LM1117MP-3.3 / LM3940 ?

LDO regulators have a finicky reputation so I would like the assurance that extracting +3.3 V power from a +5 V rail is within reach of someone as incompetent as myself.

--
André Majorel http://www.teaser.fr/~amajorel/ _______________________________________________
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