USB charger for LiIon batteries. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

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Hi all. I have an incident here the other day. The phone said "the topic of food is not disclosed!" and threw back his hooves. I mean, oiled the skis. Well, in short, turned off. And there is no one to borrow a charger from. And I don't have one myself. And some computers around. And then thinking - if only, I think, plug the phone into the computer and let it charge itself, like a PDA. Well, what to do - climbed out of grief on the Internet, to see what knowledgeable people can offer from this misfortune. It turned out that knowledgeable people from the MAXIM corporation can indeed offer something. They produce a series of microcircuits for charging almost any type of battery from a computer's USB port. One of them will be discussed now - on the topic of the day, it will be a charger for LiIon batteries.

There isn't even much to say. But since it’s still necessary, I’ll say a little. For starters, about the USB port itself. It just so happened that from this port, depending on its type - a host or a hub, we can remove 500 or 100 milliamps of pure current for our own needs. But since the microcircuit does not know exactly where it was inserted, it limits the battery charge current to 100mA. However, it has one more input - any power source can be connected to it, including the Chinese "cube", which is simply plugged into the outlet, after which it starts to warm up. In this case, the charge current will be already 350mA. If you manage to connect two sources at once - both USB and a power source, then the microcircuit will choose the latter, in the sense of not the last connected one, but the power source.

The HL1 LED is on until the battery is charged. Considering that there are not a lot of components in the circuit, and the microcircuit itself is produced in the THIN SOT 23 package, nothing prevents us from making this thing quite tiny, stuffing it inside some kind of USB connector and bringing out only the wire for connecting to the phone. And you can charge your mobile phone from anything at all - as long as it has a USB port. By the way, about USB. Below is a diagram of the pins in this connector from the side of the computer.

Publication: radiokot.ru

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