Hi,

Use the voltage regulator LP2950.

75 μA quiescent current
100 mA output current

http://cache.national.com/ds/LP/LP2950.pdf

The LP2950 and LP2951 are micropower voltage regulators
with very low quiescent current (75 μA typ.) and very low
dropout voltage (typ. 40 mV at light loads and 380 mV at
100 mA). They are ideally suited for use in battery-powered
systems. Furthermore, the quiescent current of the LP2950/
LP2951 increases only slightly in dropout, prolonging battery
life.

Distrelec = 640722 (CHF 1.02)

Best regards,

Luciano