Hi,

	I need to power a uP circuit with 3.3V @ 6mA from a 4700uF capacitor 
charged to 12V. The circuit has to run until the capacitor discharges.
	Have tried the Roman Black's SMPS circuits, but could'n go over 50% 
efficiency at this 6mA current output. Even the Zener diode current is 
excessive...

	Any ideas? Low cost and part number is a constrain.

	Thanks.
	Mark Jordan

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