7805 substitute

Comments

• kb2hap Posts: 218

  2005-02-08 03:45 edited 2005-02-08 03:45

  could you be more specific.· what are you looking for exactly?· more amps, better efficiency, different package?
  
  you make want to just take a look at the various suppliers
  
  www.mouser.com
  
  www.jameco.com
  
  www.digikey.com
  
  www.newark.com
  
  thats just to name a few...most of then also supply data sheets which can give you information on pin compatability and how to use/interface them.
  
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  DTQ
• Robert Schwartz Posts: 141

  2005-02-09 00:00 edited 2005-02-09 00:00

  Thanks kb. Has anyone heard of or used the Microchip TC1262?
• Robert Schwartz Posts: 141

  2005-02-09 00:02 edited 2005-02-09 00:02

  I am looking mostly for a lower dropout and more effieciency.
• Bean Posts: 8,129

  2005-02-09 02:27 edited 2005-02-09 02:27

  For 150mA or less check out the TL750L05CLP from TI.
  It is a TO92 package with a dropout of 0.2V @ 10ma and a max loss of 0.6V at 150mA
  Plus it's cheap. Only $0.68 for 1 pcs from digikey.
  Bean.
  
  
  Post Edited (Bean) : 2/9/2005 2:30:12 AM GMT
• Robert Schwartz Posts: 141

  2005-02-09 03:47 edited 2005-02-09 03:47

  Thanks bean, but I'm going to need at least 300-400 ma.
• Mark G Posts: 11

  2005-02-09 17:45 edited 2005-02-09 17:45

  Scott Edwards Electronic site has a good schematic for a 5VDC power supply which uses either a 7805 OR 78ST105HC.
  
  http://www.seetron.com/an_vpwr1.htm
  
  I have built the 78ST105 version and have been very happy with its performance...
• Jim G. Posts: 27

  2005-02-09 21:27 edited 2005-02-09 21:27

  I am currently working on a project that has a 24VAC power source that I·am using for my 5VDC supply.· This heats up a 7805 even at low currents.
  
  To be more "green", and also to experiment a little, I have been looking at a buck-type switching regulator, LM2574-5 from Micrel, http://www.micrel.com/.· I have avoided these circuits in the past because they seemed too complicated, but it's not so bad these days; they only use 4 external components.
  
  I haven't actually fired one of these up yet, but I plan to try it out.· It will be more expensive to use this type of regulator, around $4(?) for it and all the external parts, but it is worth checking out.
  
  Jim
• MacGeek117 Posts: 747

  2005-02-09 22:03 edited 2005-02-09 22:03

  Or you can check out Karl Lunt's book BUILD YOUR OWN ROBOT! and look for the
  JBS (Junk Box Switcher).
  bugg
  
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  So many projects, so little time.
• Robert Schwartz Posts: 141

  2005-02-10 01:07 edited 2005-02-10 01:07

  Thanks guys. I think I found what I needed though, the MAX603. I ordered a few so I'll see how well the work. Mark, that power supply liked pretty nice for getting higher voltages down to 5. I'm probably going to be using that in a different part of my project. Jim, those regulators do look nice, but they are pretty expensive, and I don't feel like ordering them in 50pc rails. Thanks though.
  Robert
• Beau Schwabe Posts: 6,547

  2005-02-25 22:43 edited 2005-02-25 22:43

  Here are a few low dropout regulators that have just been released...
  
  Low-Quiescent CMOS Regulators - February 23, 2005 News Release
  
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  Beau Schwabe - Mask Designer III
  
  National Semiconductor Corporation
  (Communication Interface Division)
  500 Pinnacle Court, Suite 525
  Mail Stop GA1
  Norcross,GA 30071

  ---
• Robert Schwartz Posts: 141

  2005-02-26 02:11 edited 2005-02-26 02:11

  Wow, only 1uA shutdown draw, and 100uA max draw. Thanks Beau, those are pretty much exactly what I was looking for.