Datasheet

Vybrid Power Consumption and Options, Rev. 0
Freescale Semiconductor 13
Powering options
Figure 5. External ballast transistor powered from VSDRAM
The block scheme of power supply solution using external ballast transistor powered from V
SDRAM
on 1.5
voltage level is captured in Figure 5.
The main difference from the previous power option is that the ballast transistor, which supplies power to
the core, is powered from 1.5V voltage level power rail. A 1.5V power supply is used for powering
SDRAM and it uses the switched mode power supply (DC/DC).
In the OOBE demo use case, the core current is 289mA. In this case:
The core power is:
Total power on LDO with external ballast transistor is:
The power efficiency it this case is:
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