LT1054 Charge Pump Q

[chrisaxeman]

Hello Lads,

Have a quick Q about the 1054 charge pump.

Having made a couple of 9>18vdc pumps that I guess resulted in a 50ma max pump,does anyone know what the maximum current available from the 1054 in "bi-polar supply doubler" guise?

I built a Geofx Adjusticator/Adjusticator mixer pair that I'm running on +ve only 18volt with an LM833,but have got some Burr Brown OPA2134's that I'm consodering running on +/-18vdc.

There isn't really any indication in the PDF what the maximum current is.

I'm not sure how to attach the pdf here.

Chris.....

[Paul Perry (Frostwave)]

Not sure exactly what you are doing, but if you are using two LT1054, one for the neg and one for the +, I would say (looking at he data sheet) you can get 50mA + and - out.

[chrisaxeman]

Hi Paul,

The manufacturer's pdf has an example to get a bi-polar doubled supply from a single +ve input.

I'm not sure how to upload the pdf here though.

Cheers for the reply

Chris.....

[R.G.]

Linear Technology has some neato datasheets and application notes.

[Paul Perry (Frostwave)]

Well, the general rule is this:
if you double the voltage, then you can get a bit less than half the input current out.
So if it is 9v going in, and you get +-9 out, that's 50mA out (half the 100mA max input).
If there exists a single chip arrangement that is 9v in and + -18V out, that's going to be 25mA.