Sri_chikoo:
Seems current consumption is 0.5mA current when in operation.
That's not what the datasheet says:
Power requirements: 3.3 VDC; power consumption
determined by micro-SD card used + 0.5 mA when
card is inserted
The current consumed is whatever the card consumes PLUS 0.5mA on insert. So if it is 65-75mA like the SanDisk card I linked to earlier, the total consumption is 65.5-75.5mA.