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DIY Stompboxes => Building your own stompbox => Topic started by: Bucksears on September 01, 2010, 01:49:39 PM

Title: Charge pumps: MAX1044 compatible/replacement for LT1054?
Post by: Bucksears on September 01, 2010, 01:49:39 PM
I'm looking at a couple of projects that use an LT1054 for voltage doubling (actually bipolar 18v). I've got some 1044's on hand and didn't know if they would be a direct-pin replacment for the L1054. Or, if there might be voltage issues between the two chips; i.e. one might have a better voltage range than the other, one is quieter than the other, etc.

Thanks,
Buck
Title: Re: Charge pumps: MAX1044 compatible/replacement for LT1054?
Post by: Taylor on September 01, 2010, 03:01:26 PM
The LT1054 has much higher current ability, so things that were designed for that chip may overheat a MAX1044, or the 1044 may just not be able to handle the circuit at all. Which circuits are you talking about specifically?
Title: Re: Charge pumps: MAX1044 compatible/replacement for LT1054?
Post by: MetalGuy on September 01, 2010, 04:25:45 PM
LT1054 can handle up to 15V. MAX1044 will need to have pins 1 and 8 connected (if used for audio purposes) unlike LT1054.
Title: Re: Charge pumps: MAX1044 compatible/replacement for LT1054?
Post by: Taylor on September 01, 2010, 04:32:27 PM
Right, MetalGuy alludes to but does not say explicitly that the MAX1044 can only handle 10v, which can be a problem if you're using an unregulated "9v" supply which puts out 12v or so.
Title: Re: Charge pumps: MAX1044 compatible/replacement for LT1054?
Post by: trixdropd on September 01, 2010, 07:15:36 PM
Would the lt1054 drop into the geofex a/b/y with no problem?
Title: Re: Charge pumps: MAX1044 compatible/replacement for LT1054?
Post by: Bucksears on September 02, 2010, 09:33:06 AM
Thanks, guys - guess I'll look into the LT1054, then.