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SATA Power supply, power rating

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StudentSA

Member
Hi,

I want to build a small power supply that can power up a SATA DVD Drive and I would like to know what type of power ratings should I design for?

I have found out that I need to provide +12V, +5V, +3.3V and Ground. What I need to know is 12V @ ??A , 5V @ ??A , 3.3V @ ??A...

I know a lot of drives do not use the 3.3V supply but I'm sure its used in this case.

I have found a 12V @ 1A, 5V @ 1A and 3.3V @ 1.5 A LDO Regulators, should this be fine?

Any advice is appreciated.
Thanks,
StudentSA
 

Reloadron

Well-Known Member
Most Helpful Member
You may want to note from Eric's link:

Adapters exist which can convert a 4-pin Molex connector to a SATA power connector. However, because the 4-pin Molex connectors do not provide 3.3 V power, these adapters provide only 5 V and 12 V power and leave the 3.3 V lines unconnected. This precludes the use of such adapters with drives that require 3.3 V power. Understanding this, drive manufacturers have largely left the 3.3 V power lines unused.
I have yet to encounter a SATA drive that requires the 3.3 volts. As to current on the 12 and 5 volt lines? If you allow for 1 amp it should be adequate.

Ron
 
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