The manual states the maximum consumption based on SD/MMC card standards.

Here is our measurements for a Lexar 64MB MMC card. Current measurements may vary with different cards.

uMMC Power Consumption

@5.0V nominal maximum
idle 8.5 mA 15.0 mA
read 15.0 mA 30.0 mA
write 40.0 mA 60.0 mA