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Re: 5V 200mA LDO with 0.5% accuracy

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Spehro Pefhany wrote...
>
> On 3 Nov 2016 18:52:13, Winfield Hill wrote:
>
>> Low-voltage devices need not apply, need 14V min.
>> Power package.  Would like 0.5% accuracy, but will 
>> take 1%.  Only ON Semi's version of NSC's ancient
>> LP2950A, in DPak, seems to qualify.  Can this be?
>
> The Venn diagram gets a little slivery when you combine
> power + tight tolerance + high voltage but here are a
> couple that are pretty good, and a few more that are
> close. I didn't do an exhaustive search. 

 Hey, Spef, for a non-exhaustive search, you found a
 lot!  More than I found in AoE-III Tables 9.3 amd 9.8,
 plus another 30 minutes of poking around!  Thanks!! 

 You also included SOT-223 stuff, which I was going
 to add to my list of qualifications, since it's a
 nice small power package.

>LDFM50PT-TR  16V 1% 500mA 0.125V dropout at 0.5A  $1.36 <--
>ADP7118 (exposed pad, probably marginal or too low power) 
>BD3571 series- 2% but over -40~+125°C, 50V in, power. 
>MIC5201 SOT-223 (power?) 1% (2% over temp), 200mA  <--
>LT1129 +/- 1.5% 
>LP2954 +/- 1.2% 

 I liked ST's LDFM50, good for 500mA in DPak-5.
 The MIC5201 is nice, but spec'd for 200mA, I then
 noticed their MIC5209, 1%, 500mA and SOT-223 <---
 The LT1129, nice SOT-223-5, is rated 1.5%.  I also
 found the TPS73601, 400mA in a SOT-223-6 package,
 rated at 0.5%, very nice, but adjustable for 5V,
 have to add 1% resistors and degrade the accuracy.
 (TPS73650DCQ avail only at Rochester Electronics.)

 Bill speculates about what usefulness for a 5V 1%
 regulator, but there's a good use I have in mind.

 I'm designing a high-efficiency DC boost testbed.
 In our case, for matching small solar cells to an
 electrochemical cell.  But this testbed, to try
 various inductors, etc, working to reach say 98%
 efficiency, needs an accurate measuring ability.

 In our case, adding MPPT, good for anything solar,
 means adding a PWM stage after the boost converter,
 to match the electrochemical cell's load to the
 sun's output at any point.  So it seems natural to
 shape my PCB into an Arduino shield, and let that
 take measurements and run the MPPT show.  So, how
 to setup a precision 5.00V reference, and also run
 the Arduino, along with whatever else might get
 added on.  Using an LDO means one could power the
 board from an external USB, etc., or a 9V battery.

 Anyway, thanks very much for the help, it gets me
 past a little impasse.


-- 
 Thanks,
    - Win

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5V 200mA LDO with 0.5% accuracy Winfield Hill <hill@rowland.harvard.edu> - 2016-11-03 18:52 -0700
  Re: 5V 200mA LDO with 0.5% accuracy bill.sloman@ieee.org - 2016-11-03 20:05 -0700
  Re: 5V 200mA LDO with 0.5% accuracy Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2016-11-03 23:06 -0400
    Re: 5V 200mA LDO with 0.5% accuracy Winfield Hill <hill@rowland.harvard.edu> - 2016-11-04 06:34 -0700
      Re: 5V 200mA LDO with 0.5% accuracy speff <spehro@gmail.com> - 2016-11-04 13:46 -0700
  Re: 5V 200mA LDO with 0.5% accuracy TTman <pcw1.cad@ntlworld.com> - 2016-11-04 13:24 +0000
    Re: 5V 200mA LDO with 0.5% accuracy Winfield Hill <hill@rowland.harvard.edu> - 2016-11-04 06:43 -0700
      Re: 5V 200mA LDO with 0.5% accuracy TTman <pcw1.cad@ntlworld.com> - 2016-11-04 20:06 +0000
    Re: 5V 200mA LDO with 0.5% accuracy Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2016-11-07 09:07 -0500
  Re: 5V 200mA LDO with 0.5% accuracy Boris Mohar <borism_void_@sympatico.ca> - 2016-11-04 09:25 -0400
    Re: 5V 200mA LDO with 0.5% accuracy Winfield Hill <hill@rowland.harvard.edu> - 2016-11-04 06:53 -0700
  Re: 5V 200mA LDO with 0.5% accuracy David Brown <david.brown@hesbynett.no> - 2016-11-04 14:44 +0100
    Re: 5V 200mA LDO with 0.5% accuracy whit3rd <whit3rd@gmail.com> - 2016-11-04 11:51 -0700
  Re: 5V 200mA LDO with 0.5% accuracy John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-04 08:23 -0700
    Re: 5V 200mA LDO with 0.5% accuracy George Herold <gherold@teachspin.com> - 2016-11-04 08:33 -0700
      Re: 5V 200mA LDO with 0.5% accuracy John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-04 08:50 -0700
        Re: 5V 200mA LDO with 0.5% accuracy Jeroen Belleman <jeroen@nospam.please> - 2016-11-04 17:16 +0100
  Re: 5V 200mA LDO with 0.5% accuracy bloggs.fredbloggs.fred@gmail.com - 2016-11-04 11:02 -0700
    Re: 5V 200mA LDO with 0.5% accuracy Winfield Hill <hill@rowland.harvard.edu> - 2016-11-04 12:21 -0700

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