low dropout regulators

Discussion in 'Electronics Resources' started by kaning, Jun 8, 2014.

  1. kaning

    Thread Starter Member

    Jun 2, 2014
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    Hi, im looking for linear low dropout regulators. I already found what fitmy needs the problemi cant find where to buy them. i founf them onsemi and they sell but shiping costs 78usd. the regulators i need are

    NCV5500 - http://pdf1.alldatasheet.com/datashe...I/NCV5500.html
    NCP3335A - http://pdf1.alldatasheet.com/datashe.../NCP3335A.html
    basically they are adjustable regulators or fixed (5v) and 500 ma output with low dropout voltage

    can someone pointme where i can possibly get them? company from europe would be perfect for lower shiping. Also if someone knows some similar product please let me know.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    When you put your location in your profile, we can give you better advice where to buy your parts.

    Bertus
     
    kaning likes this.
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Digikey have them, but I don't know if they ship W.Wide.
    Max.
     
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  4. kaning

    Thread Starter Member

    Jun 2, 2014
    43
    0
    thnaks for the reply. 0 available on both, even on their manufacturer website they are out of stock (adj ones) wich i need, then they have 5v fixed output ones, wich i could also use but i cant pay 78usd for shipping. probably it will be almost impossible to find theese ones around
     
  5. bertus

    Administrator

    Apr 5, 2008
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  6. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
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    There are tons of LDO 5v regulator ICs cheap on ebay.

    Or if you want those exact parts try Farnell UK (Element14).
     
  7. kaning

    Thread Starter Member

    Jun 2, 2014
    43
    0
    im having all this trouble because i have 6v 3,7w solar panel. i want to feed usb charger (5v) and nimh charger (5,6v to charge 4nimh's (1,2v)). is it worth all this trouble find adjustable low drop converter or a step down buck converter would the job better? they dont have voltage drop right? and so what happens to current? small waste or big? thank you

    one such as this http://www.ti.com/lit/ds/symlink/lm2596.pdf
     
  8. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    A linear regulator wastes power but not current. The power loss equals the voltage drop across the regulator times the current. A linear regulator with a 6V input and a 5V output will thus have an efficiency of 5/6 or 83%. A switching converter can have higher efficiency, but in this case it likely wouldn't be much higher than the 83% of the linear regulator.
     
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  9. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Does not seem worth the trouble. Guessing that OC V of SP is a bit over 8 V and the 6 V is at rated power which is seldom seen. I'd just feed chargers directly from panel. Not enough wasted power to worry about.
     
  10. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Wouldn't you charge NiMH cells with a constant-current charger rather than a fixed 5.6V?
    As for the 5V regulator, you could simply make one from a transistor and a few other discrete components.
     
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