You could use a LP2950 which will give you 100uA quiescent and a series zener to drop the volts to below 30. If you need REALLY low quiescent current check the Seiko S-812XXPG series 1.2uA to 3.2uA max, unfortunately Vin(max) is 16 Volts :-( Ray Gardiner ray@dsp.com.au