Output current of LM109

Takahiro Nishizawa

Genius 5575 points

Other Parts Discussed in Thread: LM309, LM109

We have a question about LM109 / LM309.

Please tell us the output current.

LM109 : ?A

LM309 : 3A?

Best regards,

Takahiro Nishizawa

over 6 years ago

0 Daniel Hartung over 6 years ago

TI__Mastermind 26215 points

Hey Nishizawa-san,

LM109: 1 A

LM309: 1 A

Thanks,

Daniel

0 Daniel Hartung over 6 years ago in reply to Daniel Hartung

TI__Mastermind 26215 points

Note that an edit had to be made to the previous answer due to misinformation on the part.

Thanks,
Daniel

0 Daniel Hartung over 6 years ago

TI__Mastermind 26215 points

Hey Nishizawa-san,

Please note that the answer was edited due to misinformation on our end.

Thanks,
Daniel

0 Takahiro Nishizawa over 6 years ago in reply to Daniel Hartung

Genius 5575 points

Thank you for your answer!

LM109 : 1A
LM309 : 3A

Is this correct?

we are concerned about your message.
Please note that the answer was edited due to misinformation on our end.

Best regards,

Takahiro Nishizawa

0 Daniel Hartung over 6 years ago in reply to Takahiro Nishizawa

TI__Mastermind 26215 points

Hey Nishizawa-san,

I apologize for all of the issues on our end. There were issues on our end so the first response was incorrect.

The correct answer is:

LM109 : 1A
LM309 : 1A

Thanks,

Daniel

0 Kirby Kruckmeyer96848 over 6 years ago in reply to Takahiro Nishizawa

TI__Genius 17115 points

Please also note that the information on the ti.com about the LM309 is conflicting and incorrect. On ti.com, the title of the product page and the parametric table show the part as being 3A. The datasheet is correct in showing the part is only 1A. We are working on correcting the website.

Thank you for pointing out this error.

0 Takahiro Nishizawa over 6 years ago in reply to Kirby Kruckmeyer96848

Genius 5575 points

Thank you for your answer!

We have new questions about LM109K.

Question 1.
In datasheet p.4 "Current Limit Characteristics (Note 5)"
Output current is 1.9A When Tj is 150℃.
Is this data correct?
WE concerned about your answer. LM109 of output current is 1A.

Question 2.
Please tell us the difference between LM109K and LM109k STEEL.

Best regards,

Takahiro Nishizawa

0 Daniel Hartung over 6 years ago in reply to Takahiro Nishizawa

TI__Mastermind 26215 points

Hey Nishizawa-san,

Q1: Yes that is correct. The Current Limit is placed higher than the MAX Current of the device.

Current Limit is around 1.9 A depending on temperature

MAX Current is 1 A.

Q2:

The difference between the LM109K and LM109K STEEL is the STEEL version is slightly taller.

Thanks,

Daniel

0 Kirby Kruckmeyer96848 over 6 years ago in reply to Takahiro Nishizawa

TI__Genius 17115 points

To expand on Daniel's answers:
The LM109/LM309 maxiumum current varies and depends upon operating conditions as shown in the Current Limit plot on page 5 of the datasheet. The parametric table shows the conditions under which the part is tested. As can be seen from the notes, the different parameters are tested under different load conditions (0.5, 1.0 and 1.5 A depending upon the test).
The LM109 and LM309 have the same current limit; the LM309 has lower accuracy and temperature range.

In the TO-3 package, we only offer "K Steel" package and the dimensions are as shown in the "Order now" tab of the product page:
www.ti.com/.../samplebuy
At one time, we offered a mil grade part in a "K" package that had a shorter lid, but that product is no longer offered.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

Power management

Power management forum

Output current of LM109