# How to estimate the peak current of DDR3L DRAM and design a power supply

I am designing a board which will have 5x DRAM DDR3L Micron MT41K512M8DA-107XIT:P ($V_{DDQ}=1.35V$). The question is, how to estimate the peak current consumption of the DRAM and then design a power supply?

In their datasheet Micron specifies Burst refresh current $I_{DD5B}=160mA$.

However, this is just an avarage current measured over time as the DRAM Refresh command is executed repeatedly. I need the peak current to design my PSU. I checked Micron document TN-41-01 "Calculating Memory System Power for DDR3". It discusses just average power consumption, not peaks. It shows some example graphs with averages and peaks; for an example see below - the blue line is average given in datasheet, the green is the real current profile, but no actual values are given. It seems peak currents are manufacturer's secrets...

Who has an experience with power supplies for DDR3L? What other pitfalls are there? I already know about VTT and VREF requirements; for that we could use TPS51206 if needed. But for the $V_{DDQ}$ supply I hesitate between TPS51916 (a complete DDR supply), and a general TPS54620 that we plan to use for other supplies.