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TPS51200:connect REFIN, VLDOIN to external supply instead of VDDQ

Part Number: TPS51200

Hi team,

My customers want to use TPS51200 for LPDDR 1.1V/0.6V application, also compliant to 1.2V/0.6V application.

They wonder whether it's OK to connect REFIN & VLDOIN to external supply instead of VDDQ. Could you please share your comments?