LM5018: Absolute Maximum Ratings (SW to RTN)

K.Yaita

Part Number: LM5018

Hi Team,

Absolute Maximum Ratings of SW to RTN shows the following.

On the other hand, LM5018EVM user's guide shows the following SW waveform and it exceeds VIN+0.3V in obvious.

http://www.ti.com/lit/ug/snva666a/snva666a.pdf

How should we think it?
The background of the question is I heard SW to RTN voltage exceeds Absolute Maximum Ratings(Vin+0.3V) in my customer's application.

Best Regards,
Yaita

over 5 years ago

0 Timothy Hegarty over 5 years ago

TI__Guru 56432 points

Hello,

SW node voltage overshoot is mitigated by reducing the switching loop parasitic inductance. The key is to locate the input cermic capacitor close to the VIN pin of the IC. For more detail, please see:

http://www.ti.com/lit/an/slyt682/slyt682.pdf

Please forward the PCB layout for review.

Regards,

Tim

0 K.Yaita over 5 years ago in reply to Timothy Hegarty

Guru 29700 points

Hi Tim-san,

Thank you for your kind support!
I would like to send in off-line.
Could you send me a private messsage?

I can put e-mail address if you can't.

Best Regards,
Yaita

0 Timothy Hegarty over 5 years ago in reply to K.Yaita

TI__Guru 56432 points

Hello Yaita-san,

I received your message. The overshoot is not excessive and looks acceptable.

Regards,
Tim

0 K.Yaita over 5 years ago in reply to Timothy Hegarty

Guru 29700 points

Hi Timothy-san,

I understand.
I appreciate for your support!

Best Regards,
Yaita

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LM5018: Absolute Maximum Ratings (SW to RTN)