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Power supply design help

Other Parts Discussed in Thread: TPS51116, TPS51916, TPS53219, CSD86330Q3D, TPS51220A, TPS51206, TPS40322

Hi guys,

I am new to DC/DC supply design...

Basically I have an input rail that ranges between 7 & 20V (up to 10A).  I need three regulated outputs 1V (6.8A; 6.8W), 1.5V(3A; 4.5W) and 0.75V(0.5A; .375W) for Vtt, DDR3.

One of the most important design criteria is footprint.  Also, the efficiency of the system is very important.  

I have look into several options:

  1. a buck converter each for 1.5V (3A) & 1.0V (6.8A).  Use a Vtt LDO for the 0.75V (0.5A).
  2. a buck converter with dual output for the 1.5V (3A) & 1.0V (6.8A).  Use a Vtt LDO for the 0.75V (0.5A).
  3. a buck converter for 1.0V (6.8A).  another buck converter with Vtt output for the 1.5V (3A) and the 0.75 (0.5A).

I am down to selecting the right parts now.  Could you guys give some insight into this?

Thanks,
Titus