Hi
LM2676S-ADJ lead-free are hard to get now. Has anyone tried substituting LM2670 series with success? I am looking at the datasheets trying to find a trap. Not using sync. Need a direct substitute without any changes to surrounding passive parts if possible.
Geoff
Fixed voltage version seems to be in better supply. What voltage is your design?
You can use the 12V version and use around 7K external R2. No R1 and no change to your circuit board.
I'll look at that option, thanks.
Watch out for thermal drift and initial accuracy, though--if the on-chip resistors are diffusions or polysilicon rather than metal, they're typically +-30% initially and have tempcos between 500 and about 5000 ppm/K. (See e.g.
Before there were LM317s, people used to do that with LM309s and 7805s.
Cheers
Phil Hobbs
Have something to add? Share your thoughts — no account required.
Ask the community — no account required