DC 5 to 12V up converter with LT3467

[V-bro]

Hi guys,

I made a prototype board with three paralleled up converter circuits with LT3467 1,3Mhz 1.1A up converter. It's an expensive chip, but incredible to see something so small deliver such performance!

It's a very simple to use circuit now, just like a 78xx series regulator with Vin-Gnd-Vout terminal. I have tested it under load and with various input voltage and it stays a pretty stable 12V at an input voltage of 4,5Vdc up to 16Vdc....

Here's a picture:
http://www.snapdrive.net/files/361770/AMP%20stuff/SNC10295k.JPG

This is the datasheet:
http://www.farnell.com/datasheets/85284.pdf



------X-max. can be several meters on any driver, too bad it can be done only once...------

[Saturnus]

Technically wouldn't that be a boost/buck converter?

[V-bro]

Charge pump yes :)

------X-max. can be several meters on any driver, too bad it can be done only once...------

[Saturnus]

So in principle I could use 4 of these on a single Li-ion cell, regardless of actual chemistry, to parallel 3 for 15V 3.3A to power an amp6basic and 1 for double line USB power 5V 1.1A.

And instead of a single Li-ion cell, I could parallel several cells instead of of putting them in serial which would make it much easier to charge.

Hmmm ... something that I've been pondering a long time but never actually seen an IC that fitted so perfectly and was so easy to use.

[V-bro]

In principle that would work, however the 1,1A is max. Current rating depends much on the voltage difference. The datasheet shows many applications with their respectively rated currents.

I haven't used it on an amp yet either, don't know how "silent" it is yet... This circuit is planned to power a 12V 3rd braking light on an old Citron 2CV car with 6V system...:)

The chip is nice, but VERY tiny so you do need to be pretty well equipped to handle it...


------X-max. can be several meters on any driver, too bad it can be done only once...------

[Saturnus]

quote:Originally posted by V-bro

The chip is nice, but VERY tiny so you do need to be pretty well equipped to handle it...




And here I thought being well equipped meant I didn't have to deal with tiny things. ;)

[V-bro]

Well if you look real close to the board above you can see the tiny chip just inder the copper coloured wires. Then there are stacks of 0805 size components...

At first I even used an SMD inductor, but it went up in smoke :) Then I unwound some 20uH inductors I had on the shelve to 4,7uH and it worked again. Like I said I had smoking components all over the place during the experimenting, but the chips stayed alive just fine! :D

------X-max. can be several meters on any driver, too bad it can be done only once...------