can anyone point me to an IC that i could use to fairly simply and efficiently step 3v from 2 AA cells to 5V for powering a USB device. i have been searching and have come up with a few, but im not exactly sure what i should look for.
if you could also let me know any other components i will need, and a basic run through of how to set it up i would appreciate it a lot. thanks
National Semiconductor's web site will pick a part for you and design the circuit, all online.
John
thanks for the resource.
using the requirements of Vin = 2.2 - 3 V and Vout = 5V Iout = .5 A i came up with a LM2702-ADJ. the other features such as building the circuit are not offered for this product (at least i didnt see the options like it shows in the help video). any further assitance would be appreciated
Alright, I am coming up with some things that seem like they would work at the sites I am being sent to, but I still havent recieved any solid guidance. I would appreciate it if someone could tell me the appropriate parts and help me figure out the other pieces I will need. Im sorry Im such a beginner, but I really appreciate any help.
If you want it really simple, go to the Maxim
Order one of the EV kits, and they'll send (sell!) you a working board.
Can't get much simpler.
-- Namaste--
wrote
Go to the Maxim site. If you don't like Maxim then try Linear Technology.
These are standard parts [as standard as things get these days...]
-- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. To reply, remove spaces: n o lindan at ix . netcom . com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
Is going with either Maxim or LT a personal preference?
Jeroen
You might as well allow Vin go all the way down to 2.0 V. Maybe even
1.8. The lower you go, the more you will get out of your batteries, although there isn't any point in going below 1.6, I think. Also, fresh batteries are about 1.6V each, so you might want to go up to 3.2. Then again, as soon as you start draining at 700 mA or whatever, the Voltage should drop instantly, so maybe 3.0 is a good upper limit after all.By the way, how long do you need the batteries to last? I don't think AA's are going to last very long with a drain of 800 - 1500 mA. I doubt you will even get two hours out of a fresh set of batteries.
--Mac
"Jeroen" wrote
For some, yes. Maxim had a bad shortage situation that they handled very badly. There is a lot of bad feeling towards Maxim as a result. Some firms have a 'No Maxim' policy on new designs - stupid as that may seem: wait long enough and you'll get screwed at least once by everybody and everybody will be on the blacklist.
-- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. To reply, remove spaces: n o lindan at ix . netcom . com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
Why not simply take the 5V from USB? I have done that without any problem....If you don´t need more than 500 mA it will work for you.
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