100 mA LT1054 voltage doubler layout here

[Morocotopo]

 Hi evrybody, I made this voltage doubler as a higher current alternative to the MAX1044/7660/whatever ones. The LT1054 has a 100mA max current, while most of the other chips only provide 10 mA or so. I used R.G.´s idea for input jack power switching for use in stompboxes and Tex*s Instr*ments and Nelson´s schems. It´s verified, prototype made, works OK. Disadvantages: the chip is kind of expensive, at least here.
Oh, by the way, I made this for use with my Neovibe and my Polyphase (both 18V pedals), so that I didn´t have to use a separate power supply with them, and it doesn´t work with either of them!!  Guess they require more than 100 mA... ooops.... Grrrrrrr....
The datasheet of the LT1054 says that devices can be parallelled. I guess that would give me 200 mA, wich COULD be enough for powering those pedals, but there´s no example for a voltage doubler with 2 chips in parallell in it. Anybody could help with that? I´m a little afraid of burning the chips trying to make that.

Morocotopo

(edit) easily converted from PCB to perfboard, just follow the dots

[bluesdevil]

Many thanks for this I have some of those chips on hand!! Very sorry to hear it doesn't work for the NeoVibe, but hopefully will be good for other things.

[Morocotopo]

Update: after reading a bit some posts and the Linear Technology datasheet (I had the Texas Instruments one) for the chip, some things to consider:

Both have the same application example circuits, but the Linear one, on the "voltage doubler" example, lists the output current at 50 mA. The Texas Instruments one doesn´t list an output current for the same example. Both datasheets seem to emphasize the use of the chip as an inverter, more than as a voltage doubler (more application examples). My guess: the chip has a 100 mA out current when used as an inverter, but only 50 mA when used as a voltage doubler. Anyone can support / destroy my theory?

Morocotopo

[bluesdevil]

I just remembered something. A few years ago, Nelson posted a schematic/layout that I tried to use on a PT-80 delay I was building, but didn't work. Has anyone actually gotten the LT1054 to work as a voltage doubler in a stompbox circuit?
  BTW, the PT-80 works fine on 9 volts!!

[CGDARK]

Update: after reading a bit some posts and the Linear Technology datasheet (I had the Texas Instruments one) for the chip, some things to consider:

Both have the same application example circuits, but the Linear one, on the "voltage doubler" example, lists the output current at 50 mA. The Texas Instruments one doesn´t list an output current for the same example. Both datasheets seem to emphasize the use of the chip as an inverter, more than as a voltage doubler (more application examples). My guess: the chip has a 100 mA out current when used as an inverter, but only 50 mA when used as a voltage doubler. Anyone can support / destroy my theory?

Morocotopo

Remember voltage is directly proportional to current so if you double the voltage you'll get half the current.

Use Ohm's law to calculate and support your theory. 

P=V*I

CG

[Morocotopo]

CG: of course,  I knew that all the time, i was just checking if you were paying attention...

Somehow Ohm´s law hasn´t yet been ingrained into my brain cells. Thanks for remainding me.

Bluesdevil, this layout works, with the neovibe it works good, it just doesn´t provide enough juice to make it vibe at slow speeds. I guess the neovibe wants around 50mA, so it´s barely enough for it, the Polyphase doesn´t phase at all, so I guess it wants more than the (supposedly) 50 mA this chip provides.
I checked it with a DMM, Vout is OK(double than what it´s fed). Oh, and no noise at all.

So, next task is to design a voltage doubler with 2 chips in parallell, for 100 mA output. Hmmmm. New thread ahead.

Morocotopo