USB Charger Project - My first =D

Hey peeps.

First of all ill introduce myself. My names Omer and I live in the uk. I love electronics and will train to be an electrician soon but Im learning fast that I still know next to nothing about electronics and the way things work hehe.

Right!

What I am intending to build is a portable usb charger for my HTC Kaiser.

I want to charge this from a usb port and have some idea when the battery is full.

I ordered an 3.7v 2000mah lithium nintendo ds battery and intend to use some means to get this to a steady 5volt supply.

I have done some reading and it seems that I will need an IC to get the voltage up to 5volts. Is this true? Is this the most efficient way to do this?

will i need to use any regulators or capacitors?

how easy will it be to add a cut off charger for when the battery is full?

Many thanks in advanced

Soogs~

Look for a switching regulator to boost your voltage up from 3.7 volts to 5 volts.

For charging a lithium battery you have to be very carefull - use a dedicated lithium IC charger - have a look at www.maxim-ic.com

This might helps a little .....
**broken link removed**

picbits said:

Look for a switching regulator to boost your voltage up from 3.7 volts to 5 volts.

For charging a lithium battery you have to be very carefull - use a dedicated lithium IC charger - have a look at www.maxim-ic.com

This might helps a little .....
**broken link removed**

Click to expand...

Cheers dude.

looks like im going to have to alot of research before i can start making anything.

would you recommend ditching the li-ion battery and getting a ni-mh one instead?

thanks again.

Soogs~

Isn't this all a bit pointless as the phone charges thru the USB port anyway?? or is it to charge the phone via an external battery in which case why use a nintendo ds battery oris it because you carry one around. Look for SMPS in boost configuration to increase the voltage output.

Ni-Mh are a lot easier to charge and maintain and dont tend to erupt in flames if you get it wrong