[SI-LIST] Re: DDR3 VTT Regulator
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Praveen Jose <Praveen.Jose@xxxxxxxx>
- Date: Tue, 09 Mar 2010 02:06:24 -0800
Even though your calculations appear slightly off by about 5%, you
appear to have plenty of raw current margin.
Steve.
Praveen Jose wrote:
> Hi Techies,
> I am using an SOIC with two DDR3 controllers inside for a mobile base station
> application. The configuration for each controller is 32 Bit+4 Bit ECC (128MB
> - 4 devices for data and One for ECC). So there will be total of 10 on board
> DDR3 ICs.
>
> I have choose TPS51200 for the VTT regulator and my question is
> Can I use the same regulator for both the controller VTT power? Ie I am
> planning to use a single TPS51200 regulator (0.75V VTT) for all 10 devices (5
> each on the controller). Can anybody suggests is there any issues by
> connecting like this. I searched for some application note but I could not
> find any details. The calculation is as below
>
> TPS51200- 3A Source/ Sink regulator
> Current/ terminal = 0.75V/36.5= 20mA (Termination R = 36.5 Ohm)
> Total no of termination lines = 26 Lines
> Therefore the total current = 26 * 20 = 520mA
>
> For two DDR3 controller the Total current requirement is = 520*2= 1040mA
>
> Since regulator is capable of sourcing 3A can I use same regulator for both
> the case? Please give me your suggestions.
>
>
> Thanks,
> Jose
>
>
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Steve Weir
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