2 TPS51200 in parallel ?

Edward Kodde

Other Parts Discussed in Thread: TPS51200

Hi,

I am designing a board with a lot of DDR chips on it. The total current needed on VTT is >3A . Can I just put two TPS51200's in parallel ? Or do I need to split the VTT plane in 2, one for each TPS51200 ?

Regards,

Edward

over 13 years ago

0 Nancy Zhang over 13 years ago

TI__Mastermind 49370 points

Hi Edward,

I recommend spit the VTT plane in 2, one for each TPS51200. Because TPS51200 doesn't have current sharing capability.

Thanks,

Nancy

0 Edward Kodde over 13 years ago in reply to Nancy Zhang

Prodigy 50 points

Hi Nancy,

Is there a "smart" way to connect them ? i.e. REFIN from one regulator to REFOUT from the other ? Or should both regulators have their own set of resistors to provide the reference voltage ?

Thanks,

Edward

0 Nancy Zhang over 13 years ago in reply to Edward Kodde

TI__Mastermind 49370 points

Hi Edward,

You can use one set resistors to provide REFIN voltage for both TPS51200. But each TPS51200 should have their own 1nF filter capacitor close to REFIN pin.

Thanks,

Nancy

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2 TPS51200 in parallel ?