LT3081 and LT3091: are they worth their price?

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OlegSh

Member
Joined 2010
#1
Hi,

I plan to design a low noise bipolar PSU using newer through hole reg ICs. Apart from the TI's TPS7A47/TPS7A33 which are no longer available in TO220 package the next best regs I could find are the AD's LT3081/LT3091. The question is are they worth their price if I am not interested in programmable current limit and other additional built-in stuff? At the moment these regs cost around 7 ~ 8 Euro each.

Regards,
Oleg
 
#2
Let me put my question different. Are there significant benefits in using these parts instead of LM317/LM337 for line level audio applications which justify the price premium? The problem is that PSRR of LT3081/LT3091 is only marginally better, if at all, than the PSRR of the LM317/LM337. Also at HF the PSRR of the LT3081/LT3091 is nothing spectacular. LT3081 is also not a LDO part. The only obvious benefit is significantly lower noise.
 
#4
Indeed, using few more relatively inexpensive discrete parts the standard LM317/LM337 can be made as quiet as the newer parts, hence the question about the price. May be I should really forget about LT3081/LT3091 regs for now.
 
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