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Old 11-21-2005, 09:52 AM   #1
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DC DC power supply
Im looking for a DC DC power supply that:

Input: 12-30V
Output: 5V
Putput current: 150mA or more
Efficiency: 85-90%

I need it to be in a small package. If you know of any, please post. Thank you.
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Old 11-21-2005, 10:26 AM   #2
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I am acually looking for a switching regulator, so when the input ranges for 12-30V it should output 5V.
Last edited by modh1984; 11-22-2005 at 02:42 PM.
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Old 11-21-2005, 10:55 AM   #3
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http://www.mp3car.com/store/product_...roducts_id=138
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Old 11-21-2005, 02:48 PM   #4
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2 big and not quite what im looking for... im looking for something like this ( http://focus.ti.com/lit/ds/slts057b/slts057b.pdf ) but smaller and i dont need 1.5A of output current.. .. i need only 150mA

http://focus.ti.com/lit/ds/slts057b/slts057b.pdf

Thanks
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Old 11-21-2005, 06:28 PM   #5
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Radio Shack 7805 5volt regulator.
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Old 11-22-2005, 02:41 PM   #6
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I found what I was looking for, thanks for your help.

http://cache.national.com/ds/LM/LM2671.pdf
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Old 11-22-2005, 03:29 PM   #7
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Quote: Originally Posted by modh1984
I found what I was looking for, thanks for your help.

http://cache.national.com/ds/LM/LM2671.pdf

Overkill, and to much external components.

Try a 7805 as mentioned earlier. Needs 2 caps and your done.

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Old 11-23-2005, 03:01 AM   #8
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>Try a 7805 as mentioned earlier. Needs 2 caps and your done.

That's an LDO. Might get hot, but not too much at 50-100mA.
Not high efficiency. Rather more like 40% efficiency.

-Andrei



Quote: Originally Posted by Wiredwrx
Overkill, and to much external components.

Try a 7805 as mentioned earlier. Needs 2 caps and your done.

Michael
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Old 11-23-2005, 01:18 PM   #9
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Quote: Originally Posted by andrewb
>Try a 7805 as mentioned earlier. Needs 2 caps and your done.

That's an LDO. Might get hot, but not too much at 50-100mA.
Not high efficiency. Rather more like 40% efficiency.

-Andrei


I agree it isn't very efficient, though I am not sure why that matters to the OP. As for heat, at 100ma that really shouldn't be an issue. If it is, he can always use something like an LM338, which at 100ma probably won't even notice the heat.

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Old 11-23-2005, 01:20 PM   #10
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heat produced at 150mA

will be nothing.
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Old 11-23-2005, 01:56 PM   #11
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7805 is too big... I need something smaller and i think the lm2671 will work for me. i didnt mention this on my first post but i need an enable pin also.
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