LMZ14202H: LMZ14202H

Intellectual 440 points

Narendra S10

Replies: 4

Views: 34

Part Number: LMZ14202H

Hello guys,

I am using LMZ14202H as a BUC Regulator in my application.

1. Input 42V to generate 28V @ 1A - This has power dissipation of 1.8W

2. Input 42V to generate 5V @ 1.2A - This has power dissipation of 1.3W.

My query is

1. Can the package handle this Power dissipation

2. What is the maximum power dissipation that the package can handle.

I am using a FR4 0.8 mm/1oz PCB.

What are the extra precautions I need to take care in schematic and Layout.

Thanks

Narendra

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Mastermind 22555 points

Samuel Jaffe
- Feb 23, 2021 4:41 PM
Narendra,

The maximum power dissipation is dependent on the ambient temperature and the temperature rise of the device during operation. This device is rated to 125C junction so that is the upper limit.

Section 6.4 in the datasheet gives 16C/W(dissipated) and 18.4C/W(dissipated) for particular board conditions assuming the board follows layout guidelines. There are also many thermal derating curves in the datasheet. And figure 54 shows thermal resistance vs board area for a typical condition.

-Sam

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Intellectual 440 points

Narendra S10
- Feb 25, 2021 6:09 AM
In reply to Samuel Jaffe:

Hello Sam,

Thanks for the reply.

My maximum operating temperature is +55C. The power dissipation of the device is 2W which translates to 40C temperature rise.

Total temp=95C which is <125C. So it is safe to use.

Correct me if I am wrong.

Regards
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Mastermind 22555 points

Samuel Jaffe
- Feb 25, 2021 3:14 PM
In reply to Narendra S10:

Narendra,

That is the correct calculation. This should be safe to use assuming a good thermal layout.

-Sam

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Intellectual 440 points

Narendra S10
- Feb 26, 2021 3:45 AM
In reply to Samuel Jaffe:

Dear Sam,

Thank you for your support.

Regards

Narendra
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