jelly bean Switching Regulator Alternative to 7805 - Page 1
Forum section: electronics / beginners

author: RoadRunner
author_rank: Frequent Contributor
timestamp: January 17, 2014, 09:04:31 am
content: i am looking for a low cost very easily available,(most of the places ) 5V switching regulator for an open source project so that every one can easily found the part.please help my by suggesting few part numbers.

author: dr.diesel
author_rank: Super Contributor
timestamp: January 17, 2014, 09:12:58 am
content: You don't list your country, but the OKI-78SR Series are easily available in the US, probably everywhere.

author: poorchava
author_rank: Super Contributor
timestamp: January 17, 2014, 09:15:49 am
content: MC34063. Can't get more jellybean than that

author: RoadRunner
author_rank: Frequent Contributor
timestamp: January 17, 2014, 09:21:54 am
content: its not about my country, i want to use most generic part so that any body who is trying to build the hardware have easy access to the parts.

author: fcb
author_rank: Super Contributor
timestamp: January 17, 2014, 09:35:33 am
content: Quote from: poorchava on January 17, 2014, 09:15:49 am+1

author: jeremy
author_rank: Super Contributor
timestamp: January 17, 2014, 09:35:40 am
content: I use these in basically everything:http://www.ebay.com.au/itm/DC-DC-LM2596-Step-Down-Module-Adjustable-Converter-Power-Supply-Output-1-3-35V-/400595983355?pt=AU_B_I_Electrical_Test_Equipment&hash=item5d45619bfb&_uhb=1

author: BravoV
author_rank: Super Contributor
timestamp: January 17, 2014, 09:39:34 am
content: Quote from: Gaurav on January 17, 2014, 09:21:54 am+1 for MC34063, if you're aiming to ease the circuit builder and still they can't source this chip easily, then I don't think they can easily complete the build, that MC34063 is like the 7805 ic of the switching IC big families.

author: dr.diesel
author_rank: Super Contributor
timestamp: January 17, 2014, 09:40:42 am
content: When you say alternative to the 7805, I think pin compatible? Is that what you're looking for?

author: RoadRunner
author_rank: Frequent Contributor
timestamp: January 17, 2014, 11:08:00 am
content: alternative to 7805 means , a 5V switching regulator as common and widely available as 7805 is , pin compatibility is not the issue.

author: arcom
author_rank: Contributor
timestamp: January 17, 2014, 11:20:59 am
content: Well, LM2595/LM2596 are pretty common nowdays and are easy to work with.

author: fcb
author_rank: Super Contributor
timestamp: January 17, 2014, 11:43:24 am
content: Quote from: arcom on January 17, 2014, 11:20:59 amAgree.But the LM2595 is a $2 part and the 34063 is $0.2 - depends on how much current the OP wants.

author: mariush
author_rank: Super Contributor
timestamp: January 17, 2014, 11:50:31 am
content: MC34063 is cheap, but I would avoid it simply because it doesn't have as many protections as newer switching regulators on the market, and it's also kind of low frequency which means you need to use larger inductors so it takes a bit of space on the board.LM25** are available everywhere and are easy to use but these are also 60-100 kHz.I would probably investigate a chip like TPS54233 when I need something a switching regulator design.. smaller inductor, ceramic capacitors, up to 2 a, 85%+ efficiency, available everywhere, cheap in quantity (less than 0.67$ when buying 100):http://www.digikey.com/product-detail/en/TPS54233DR/296-23902-1-ND/1967871http://uk.farnell.com/texas-instruments/tps54233d/ic-step-dn-swift-conv-2a-8-soic/dp/1755639Datasheet here:http://www.ti.com/lit/ds/symlink/tps54233.pdf(also has link to software you can use to calculate the extra components required)