LMZ31710: Thermal resistance

Hirotsugu Kobayashi

Part Number: LMZ31710
Other Parts Discussed in Thread: LMZ31707, LMZ31704

Hi team,

The thermal resistance of LMZ31710 does not match the notes.
LMZ31704 and LMZ31707 in the same series are defined by Θja, Ψjt, and Ψjb.
What is the correct thermal resistance for the LMZ31710?

Best Regards,

over 2 years ago

0 Eileen Hernandez Hernandez over 2 years ago

TI__Expert 4598 points

Hi Hirotsugu,

Please see the thermal resistance graph for LMZ31710 below:

https://www.ti.com/lit/an/snva848a/snva848a.pdf#page=6

Regards,

Eileen

0 Hirotsugu Kobayashi over 2 years ago in reply to Eileen Hernandez Hernandez

Mastermind 9465 points

Hi Eileen,

No, my question is the correct value of Ψjt.
The datasheet notes RΘjb as Ψjt and Ψjt as Ψjb.
Other products have Ψjt of 1.6°C/W.
Isn't it a typo?

0 Eileen Hernandez Hernandez over 2 years ago in reply to Hirotsugu Kobayashi

TI__Expert 4598 points

Hi Hirotsugu,

The correct values are in the LMZ31707 and LMZ31704 datasheet. LMZ31710 seems to have a typo on thermal section. Ψjt should be 1.6°C/W.

Regards,

Eileen

0 Hirotsugu Kobayashi over 2 years ago in reply to Eileen Hernandez Hernandez

Mastermind 9465 points

Hi Eileen,

Please correct the datasheet.

The TI E2E™ design support forums will undergo maintenance from July 11 to July 13. If you need design support during this time, open a new support request with our customer support center.

Power management

Power management forum

LMZ31710: Thermal resistance