Re: voltage regulator configuration

On Jun 13, 4:08 pm, "kalyanamsaritha" <kalyanamsari...@xxxxxxxxx>
wrote:
Hi,

I have a power requirement for +5V, +3.3V and +1.8V.

Studying available designs, I have seen both parallel and series
configuration.

1. Series

+5V DC input with voltage regulators connected in series to convert +5V to
+3.3V, and +3.3V to +1.8V

2. Parallel

+5V DC input to +3.3V output, and +5V DC input to +1.8V output.

In both cases, all three voltages are available.

What are the pros and cons?

Also, in the Olimex schematic (top right corner), I see a Schottky Barrier
being used (BAT54C),http://www.olimex.com/dev/images/ARM/ATMEL/SAM9-L9260-REV-B-sch.gif

I believe the main purpose was to isolate the +5V, +3.3V and +1.8V power
rails. Is this really required?

Thanks,
Saritha.

Both of your questions will be answered when you determine what power
sequencing you need. The 1st when you know the power-up sequence, and
the 2nd when you know the power-down sequence.

G.
.

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