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DDR3 VTT termination

Stephen Kim
Prodigy 620 points
Other Parts Discussed in Thread: TPS40056

A customer is looking for a DDR3 VTT termination.

Vin = 12V

Iout = 8A

Do we have an integrated device that can do thie?

 

  • 0
    TI__Guru 52195 points

    Nothing integrated, but a TPS40056 controller with external MOSFETs and an external divider will be able to support this application.

     

    Be careful when testing the sinking function of a DDR VTT rail application.  Most lab supplies do not have the ability to sink current at their outputs, and a synchronous BUCK regulator in SINK mode will boost energy from its output back to the input with fairly high efficiency.  It may be nessecary to place a small dummy load on the input to sink boosted output current when testing the sink function.  Failure to do this can result in over-voltage on the input and damage MOSFETs or controller.