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Electronics => Electronics => Topic started by: reSpawn on January 17, 2009, 08:25:02 AM

Title: 5V TO-220 regulator
Post by: reSpawn on January 17, 2009, 08:25:02 AM

Hello, I'm looking for a 5V regulator for my Atmega and I can provide maximum 6V as input.
Any suggestions?

Title: Re: 5V TO-220 regulator
Post by: Spoil9 on January 17, 2009, 08:44:49 AM

Google

Title: Re: 5V TO-220 regulator
Post by: jka on January 17, 2009, 08:47:50 AM

Microchip has some low dropout regulators here: http://www.microchip.com/ParamChartSearch/chart.aspx?mid=11&lang=en&branchID=9004.

Now that I take a look at the list, I notice that most have a max input voltage of 6V and I have been feeding mine 9V. Might be the reason why I have burned out 2 of them... :( Remember that you can probably get them as samples from Microchip.

Title: Re: 5V TO-220 regulator
Post by: Soeren on January 17, 2009, 09:26:11 AM

Hi,

Quote from: reSpawn on January 17, 2009, 08:25:02 AM

I can provide maximum 6V as input.

What is the minimum?
Is the 6V coming from 4 AA batteries?

Title: Re: 5V TO-220 regulator
Post by: jka on January 17, 2009, 09:40:11 AM

Well, untill your post made me check the site again, I was using a 9V battery, but now I'll have to find something else. Using 4 AA's might work, but note that NiCd or NiMh rechargeables are only 1.2V, so 4 of them gives 4*1.2=4.8V. Fully charged they give a little more than 1.2V, so it might work.  If you check the list, you can see a column called "Max dropout voltage". This is the voltage you will have to be over the output voltage. I use an MCP1827 which has a max dropout voltage of 330mV, so I have to supply it at least 5.330 V. Note, that this is if I was to draw 1.5A out of it. If you take a look at the datasheet, you can see on the curves at page 10, that if you draw, fx. 250mA, the dropout voltage is 0.05V, which means that it should work with as little as 5.05V input.

Title: Re: 5V TO-220 regulator
Post by: TrickyNekro on January 17, 2009, 10:34:06 AM

LM2940CT - 5

Title: Re: 5V TO-220 regulator
Post by: Soeren on January 17, 2009, 01:35:54 PM

Hi,

Personally I am quite fond of Micrels regulators and for a really low drop, I use their MIC29752BWT (max. 26 Vin variable out, 7.5A with a drop of 80 mV @ 250 mA).

For up to 16 Vin, 5 Vout, up to 7.5A and a TO220 encapsulation, the MIC29710-5.0BT should do nicely (80 mV drop @ 100mA and 220 mV @ 1.5A).

Title: Re: 5V TO-220 regulator
Post by: reSpawn on January 17, 2009, 02:52:22 PM

Thank you for your replies.
The voltage output is from an lead acid battery.

Title: Re: 5V TO-220 regulator
Post by: Admin on January 18, 2009, 09:35:43 AM

I use a L4940V5 on the Axon.