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DIY Stompboxes => Building your own stompbox => Topic started by: saxtim on April 07, 2004, 03:35:40 AM

Title: MAX1044 equivalent with higher Vin?
Post by: saxtim on April 07, 2004, 03:35:40 AM
Does anyone know if there is an equivalent charge pump of this kind that will accept a higher Vin max?  I'm looking to feed it 12 or 15 volts.

Another question, can you use the voltage doubler/tripler described at RG's site with a negative supply?  Does this require an different IC or will these charge pumps accept positive and negative voltages?

thanks

tim
Title: MAX1044 equivalent with higher Vin?
Post by: Nick123 on April 07, 2004, 10:10:30 AM
TC962  could  be  an  answer.
Vin  is  from  3  to  18V  and  Iout  is  80mA.
Title: MAX1044 equivalent with higher Vin?
Post by: saxtim on April 07, 2004, 06:53:00 PM
Hmm - that looks positive, however looking at the data sheet I wonder about the oscilation frequency.  It says you can ground one of the pins and that doubes the frequency to 24Khz - I'm wondering if that's still too low and will interfer with audio?

Also is there a chip that will do a negative voltage multiplier?

I'm trying to get a +/-60V supply give or take.  I've found a chip that will take a positive input voltage and output +/- 12 or +/-15 volts.  So taking care of the +60V seems not so hard.  It's the - 60V I don't know how to get at this stage.

thanks

tim
Title: MAX1044 equivalent with higher Vin?
Post by: saxtim on April 07, 2004, 07:05:03 PM
I waded through some more data sheets and I found this:

http://www.maxim-ic.com/quick_view2.cfm?qv_pk=3138

this looks like it might be better- will output up to 36V and then you can use a capacitor charge pump to bump that up.  Will be much easier to get it up to 60V (should only take one stage of diodes/caps).
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