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Old 27th February 2012, 01:35 PM   #1
chaparK is offline chaparK  Luxembourg
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Default Can you recommend regulators?

Good day,

I'm working on a project that's powered with +/- 12V, and need to get the following internal supplies:
+9V and -9V, 100 mA each
+5V, 150 mA

Can you recommend 'cheap' regulators for the requirements above? Preferably SMD packages.

Cheers!

Nick
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Old 29th February 2012, 09:07 AM   #2
chaparK is offline chaparK  Luxembourg
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My post hasn't been very successful so far so i try to reformulate my question.

Are there common series regulators that are cleaner than the pair 7809/7909 and aren't much more expensive? I cannot go for a discrete design, i need a chip.

Thanks for any hint!
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Old 29th February 2012, 09:14 AM   #3
syklab is offline syklab  Hong Kong
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How about the LT1086 which is available for various voltage like 5V, 9V and 12V?
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Old 29th February 2012, 09:42 AM   #4
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You have a small voltage to drop across the regulator IC. Search for low drop-out adjustable voltage regulators.

Or zener with series pass transisor for +/-9Volts,
and use LM317 for 5 volts.

Gajanan Phadte

Last edited by gmphadte; 29th February 2012 at 09:44 AM. Reason: Added content
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Old 29th February 2012, 11:42 PM   #5
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Two SMD packaged 317s and one 337. 3V of voltage drop for the +/-9V rails will be fine. A few other components needed per reg though - 2 resistors and a cap on the ADJ pin, for which i'd recommend a tantalum of 15-22uF. Should be doable with SMD components though. Add input cap of maybe 100n and output cap(s) as required - I usually use 470u and 100n. The 317/337 datasheets give all the required info.
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Old 1st March 2012, 02:41 AM   #6
chaparK is offline chaparK  Luxembourg
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Thank you all, seanjacobs, gmphadte, skylab, for your very helpful replies.

The LT1086 is too expensive, unfortunately.

I'll go for a pair LM317/LM337 for the +/-9V (actually i can make it +/-8.5V). I didn't know they're available in 'L' package rated to 100mA.
The input power comes from a smps so i plan to add a simple RC filter in front of the regulators, with R=4.7R and C=10uF. That should clean the HF.

Regarding the 5V supply i'm looking at either LM317 or LD1117XX.
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Old 1st March 2012, 02:57 AM   #7
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The best you can get for the money in conventional OEM regulators are the LT1963A/LT3015 using the "remote sense" option.

If you can do a little "manhattan style" construction, the original Sulzer regulator will do a around 150mA -- but use an opamp like the OPA134 or LME49710 for best results (original used NE5534).
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Old 1st March 2012, 06:52 AM   #8
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by jackinnj View Post
The best you can get for the money in conventional OEM regulators are the LT1963A/LT3015 using the "remote sense" option.

If you can do a little "manhattan style" construction, the original Sulzer regulator will do a around 150mA -- but use an opamp like the OPA134 or LME49710 for best results (original used NE5534).
Thanks Jack, unfortunately LT is too expensive. I can spend about 50 cents per regulated voltage ...
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Old 1st March 2012, 10:27 AM   #9
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against the published wisdom...the 78/79 series performs very nicely and will do the job in most cases. I was able to retain full datasheet performance of LT1028/AD797 circuits with those 'lousy' cheapos.
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Old 1st March 2012, 11:26 AM   #10
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Quote:
Originally Posted by chaparK View Post
Can you recommend 'cheap' regulators for the requirements above? Preferably SMD packages.
Hi Nick,

I suggest you to try On Semiconductor LM78xx/79xx or LM317/337.

They sound better than all the others 78xx/79xx, IMHO.
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