Using LT1054 in place of 1044?

[sethwitz]

Hi all, I hope you're having an easy start to the holiday season! I'm currently wrapping up a Projectile Overdrive build and I just realized I don't have any 7660s or 1044 charge pumps. I do however have a few 1054s on hand. Can I use that as a drop-in replacement for the 1044?

Thanks!

 

[fontoponto]

Yes you can but lift pin1 as it is not a boost pin as in the 1044. Leave it unconnected on the 1054. The pcb should have pin 1 and 8 connected as I can see on the schematic.

 

[Robert]

It should work fine without lifting any pins.

 

[sethwitz]

Thank you both for the quick reply! And phew, this is really reassuring to read.

 

[fontoponto]

Oh ok, pin1 is for also for shutdown btu I thought it's to shut it down above a threshold... "Pulling FB/SD below the shutdown threshold (≈ 0.45" from the datasheet. So then just replace