How to design a USB charger for mobile phone?

[shaw]

USB charger

Hi,All:
I need to design a USB charger for mobile phone. Anyone has experience about that?

 

[dll_embed]

Re: USB charger

I've seen a very simple USB charger. It just links the 5V directly to HP. No circuit needed. And it works well!

regards

 

[electronrancher]

i would use a real charger IC, nim-h get really screwed up without current limit and overcharge limit.

as long as the charger doesn't pull more than 500mA (the usb limit i think) any one should be fine. switchers are better than ldo, but it's up to you. try the maxim or linear tech sites

 

[bogdanm]

Re: USB charger

Check this link:

hxxp://www.maxim-ic.com/quick_view2.cfm?qv_pk=4002&ln=

It's an integrated charger from Max*m; if this is not what you need check their products, they have other USB-based chargers.'

 

[Taro]

Is this method harmful to USB port?
Does it damage USB port?

 

[wacksbaby]

Re: USB charger

I have read an article regarding USB universla phone charger in the EDN online magazine. It uses an IC produced by Linear Technologies. I forgot the part number, it starts with LT?????. Connecting directly to the USB port may damage your phone or the port especially if it draws more than the said capacity.