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iMX7D based design and some questions

Question asked by Mubin Icyer on Mar 13, 2019
Latest reply on Mar 15, 2019 by gusarambula

Hi,

We want to design a board based on iMX7D for a mobile application (tablet). We are investigating the schematic of SABRE board and have some questions:

  1. According to block diagram of SABRE board, there are 11 voltage sources. The total power: 

                  SW1A=1.1Vx1A=1.1W,

                  SW1B=1.0Vx1.75A=1.75W,

                  SW2=1.8Vx1.25A=2.25W,

                  SW3=1.35Vx1.25A=1.69W,

                  LDO1=1.8Vx0.1A=0.18W,

                  LDO2=1.5Vx0.25A=0.375W,

                  LDO3=3.3Vx0.1A=0.33W,

                  LDO4=2.8Vx0.35A=0.98W,

                  VSD=1.8Vx0.1A=0.18W

                  V33=3.3Vx0.35A=1,155W

Totaly ~10 watt of power! How can it be possible with a LiIon or LiPol battery? Which  powers can we "avoid" for a battery application? If we could neglect (or avoid) some power schemes, which PMIC (with battery charging functionality) could you recommend?

 

      2. Which SDRAM should we use, DDR3L or LPDDR3. I think LPDDR3 is suitable for package-on-package designs. Is there any other advantages of LPDDR3 over DDR3L?

 

Thanks.

            

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