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Old 03-08-2011, 07:05 PM #1
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Default Sold Out: 3A LDO Regulator LD1085 (LM317 type)

I got the wrong size part to make a 3A version of my driver. These are about the same size as LM317's but with bent legs for use on SMD pads.

Part#: LM1085D2T by ST Micro
Package: D2PAK
Datasheet: www.st.com/stonline/books/pdf/docs/6738.pdf

0 available.


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Old 03-08-2011, 07:46 PM #2
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

Hey guys -

Gobble these up - they're phenominal ICs. They work just like LM317s, and you can pretty much use them in place of LM317s without adjusting your circuit.

Except instead of being limited to ~1.5 A, they'll handle up to 3A, and instead of dropping ~2.5 V like an LM317, they only use about half of that.

This is a great deal too. You won't regret it. I just used this IC (thanks for the tip Jib) in my latest build this afternoon (shameless plug, hehe) and it's an awesome chip to work with!
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Old 03-08-2011, 09:33 PM #3
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

Thanks rhd! Dropout on these are only 1.5V. They do requires 10uF ceramic input and output caps per the datasheet.
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Old 03-08-2011, 09:54 PM #4
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

I've been using the 1085s (and 1084s) a bunch since you suggested them. Awesome little chips. As per your suggestion, I just put a 10uF ceramic on the input and output. All in all, it's still < $4 for the circuit.
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Old 03-08-2011, 10:04 PM #5
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

That's not too bad shipped. You can get them for about $1.90 each at Mouser, so this saves you that cost.
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Old 03-08-2011, 10:40 PM #6
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

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Originally Posted by Bionic-Badger View Post
That's not too bad shipped. You can get them for about $1.90 each at Mouser, so this saves you that cost.
Yup, minimum shipping at mouser is over $5.
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Old 03-10-2011, 06:08 PM #7
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

7 still available.
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Old 03-10-2011, 07:13 PM #8
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

Any chance you could provide the 2 needed 10uF capacitors with the LM1085 for additional cost?
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Old 03-10-2011, 07:24 PM #9
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

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Originally Posted by Drew View Post
Any chance you could provide the 2 needed 10uF capacitors with the LM1085 for additional cost?
Yes, I do have a very limited amount of extra caps (8). Only $1 extra for each *pair* of caps (IIRC I paid like $0.59 each for these). These are 1206 sized 10V SMD caps from TDK.
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Old 03-10-2011, 07:49 PM #10
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

Again, I'll attest to the fact that this is a great deal. 10uF ceramic caps aren't dime-a-dozen like aluminum electrolytic caps, etc.
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Old 03-10-2011, 08:52 PM #11
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

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Originally Posted by jib77 View Post
Yes, I do have a very limited amount of extra caps (8). Only $1 extra for each *pair* of caps (IIRC I paid like $0.59 each for these). These are 1206 sized 10V SMD caps from TDK.
That's great! I'd really like one and a *pair*.
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Old 03-10-2011, 09:00 PM #12
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

Ok let's do 2 sets, I always regret not getting a spare.
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Old 03-10-2011, 09:32 PM #13
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

Hmm I guess I'm gonna need two or three of these....
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Old 03-11-2011, 06:02 AM #14
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

hey jib, by any chance do you know what the adjust pin/reference voltage is on these guys. Im not hijacking the thread, just pm me if you know cuz the datasheet didnt specify the reference voltage so i dont know what value resistors to use cuz i have a few lying around.
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Old 03-11-2011, 06:29 AM #15
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

Vref is the standard 1.25V. But you are right the Datasheet for ST's version of the 1085 doesn't explicitly state it like other companies (ie National Semi: http://www.national.com/ds/LM/LM1085.pdf)
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Old 03-15-2011, 04:15 PM #16
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Default Re: FS: 3A LDO Regulator LD1085 (LM317 type)

Got them yesterday. Thanks a bunch!
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