SMPS 2.5V(2xAA) to 3.3V
Does anybody here have some experience with SMPS? I know that I need a boost converter for a handheld application, but I'm not quite sure where to get information on this. I estimated the current consumption to 200mA peak, 100mA normal. If some of you have schematics or advice, it would be appreciated. I would also like to know which chips are better/easier for this.
Fred
Fred
Comments
-Phil
1A continuous from the battery = 1h20 estimated battery life
0.75A = 2h15
0.5A = 4h
0.25A = 9h
Option 1 : voltage doubler and ldo regulator
if I have let's say 140mA continuous from the system, the ldo will dissipate 2(2*1.5v) = 6 volts * .140 = 840mW. The datasheet for the voltage doubler says that the efficiency is about 85%, so I suppose the total power is about 1W. So the battery current is about 1W/3V = 333 mA... so by extrapolation I get about 7h. Does my maths make sense?
Option 2 :
I found the L6920D from ST, it is a one chip solution, easier than I thought!
Scratch that, the Device you selected is just fantastic, the Package is a 0.65 pitch One, Quiite Small.
Scratch that, the Device you selected is just fantastic, the Package is a 0.65 pitch One, Quite Small.