TPS51116: How to increase VTTREF while leaving VDDQ at 1.8V

Mitchell

Part Number: TPS51116

Hi Team,

I have a customer who is using the TPS51116.

The switcher for DDR2 is configured for 1.8V output. Therefore, VTT and VTTREF are 0.9V. They'd like to get VTTREF a little higher (1.0V); but keeping the switcher output at 1.8V. Are there any tricks to do this?

One thought is to add in a divider between VTT and VTTSNS that might produce a higher voltage at VTT and VTTREF. Let me know if this is possible to do.

Thanks,
Mitchell

over 8 years ago

0 Weidong Zhu over 8 years ago

TI__Expert 5965 points

Hi Mitchell,

I agree you can add a divider between VTT/VTTSNS and GND to increase VTT output voltage. However, this will only increase VTT voltage and VTTREF will remain the same (0.9V). But I don't see a way to increase VTTREF voltage in this case.

Regards,
Weidong

0 Mitchell over 8 years ago in reply to Weidong Zhu

TI__Expert 4915 points

Hi Weidong, thanks for the quick response and clarification.

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TPS51116: How to increase VTTREF while leaving VDDQ at 1.8V