9V Battery life when used with 5V DC/DC step down converter?
An alkaline PP3 is rated at about 550maH @9V.
Does this mean if I use a DC/DC step down converter to convert it down to 5V that I'd get something in the order of 850maH out of the same PP3? (I've lobbed a bit off for losses attributed to the DC/DC conversion).
I'm looking to feed a circuit with 5V (which has a PIC onboard - along with some analogue stuff)...but I'm constrained to a PP3 (I'd much rather use AAs!)...just trying to work out the best way forward for maximising battery life.
Also just wondering what the pros/cons are of say a PWM LDO regulator to regulate 9V down to 5V vs a dedicated DC/DC converter?
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