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Electronics => Projects, Designs, and Technical Stuff => Topic started by: SharpEars on October 21, 2014, 07:16:08 pm

Title: Best linear regulator IC for a 5 volt 1 amp supply
Post by: SharpEars on October 21, 2014, 07:16:08 pm
What are the best choices for linear regulator ICs that can put out a fixed 5 volt 1 amp output with a low part count? Things I am interested in are low (ripple) noise, short circuit protection and if possible more output current than 1 amp (e.g., 5 amps). Cost is not a factor.

In other words, what's much better than the ancient 7805?
Title: Re: Best linear regulator IC for a 5 volt 1 amp supply
Post by: SeanB on October 21, 2014, 07:26:11 pm
How about 10A from LT? LT1038 or the venerable LM396.

http://cds.linear.com/docs/en/datasheet/1038fa.pdf (http://cds.linear.com/docs/en/datasheet/1038fa.pdf)

http://offer-shem.narod.ru/data/lm/lm196.pdf (http://offer-shem.narod.ru/data/lm/lm196.pdf)


Or if you want something more modern ( or at least stil likely in production), LT has a LDO for you.

http://cds.linear.com/docs/en/datasheet/158125fa.pdf (http://cds.linear.com/docs/en/datasheet/158125fa.pdf)



Title: Re: Best linear regulator IC for a 5 volt 1 amp supply
Post by: SharpEars on October 21, 2014, 07:50:34 pm
Quote from: SeanB on October 21, 2014, 07:26:11 pm
How about 10A from LT? LT1038 or the venerable LM396.

http://cds.linear.com/docs/en/datasheet/1038fa.pdf (http://cds.linear.com/docs/en/datasheet/1038fa.pdf)

http://offer-shem.narod.ru/data/lm/lm196.pdf (http://offer-shem.narod.ru/data/lm/lm196.pdf)


Or if you want something more modern ( or at least stil likely in production), LT has a LDO for you.

http://cds.linear.com/docs/en/datasheet/158125fa.pdf (http://cds.linear.com/docs/en/datasheet/158125fa.pdf)

A lot of this stuff is obsolete or has been replaced. Isn't there a good precise low-noise modern linear regulator?
Title: Re: Best linear regulator IC for a 5 volt 1 amp supply
Post by: SeanB on October 21, 2014, 08:37:59 pm
Google linear regulator 5V 10A and choose, these were the top few and the LT part might still be available. You probably will get lower current ones though, those were popular when Intel introduced the Pentium which needed low core voltages and you could make them off the 5V rail with linear regulators without too much heat.
Title: Re: Best linear regulator IC for a 5 volt 1 amp supply
Post by: rsjsouza on October 21, 2014, 08:39:30 pm
I am familiar with NSC and TI parts (now the same thing).

Around 1A I have used the 5.0V fixed (TPS76750 (http://www.ti.com/product/TPS76750)/TPS76850 (http://www.ti.com/product/TPS76850)) and adjustable (TPS76701 (http://www.ti.com/product/TPS76701)/TPS76801 (http://www.ti.com/product/TPS76801)) - these are SMD only.

In TO220 and more than 1A I know the LM108x series: the LM1084 (http://www.ti.com/product/LM1084) at 5A, LM1085 (http://www.ti.com/product/LM1085) at 3A and LM1086 (http://www.ti.com/product/LM1086) at 1,5A.

Title: Re: Best linear regulator IC for a 5 volt 1 amp supply
Post by: Marco on October 21, 2014, 10:34:44 pm
Slightly less than 1A, but adm7150 is the low noise/ripple king of LDOs I think.
Title: Re: Best linear regulator IC for a 5 volt 1 amp supply
Post by: mariush on October 22, 2014, 03:49:32 am
1117 can do 0.8 - 1.2A (depends on manufacturer and package type)
7805 can do 1  - 1.5A

LT1085 can do 3A
LT1084 can do 5A
LT1083 can do 7.5A

Replace LT with something else (LM for example) to get similar chip from other manufacturer. These three can also be safely paralleled to get more current.

LM317 the classic adjustable linear regulator... can configure to output 5v and 1.5-2A

These I used... lots of other linear regulators that look good in the datasheet.