TPS7A92: tps7a92

Hareesh p

Prodigy 30 points

Part Number: TPS7A92

Hi,

I'm planning to use TPS7A92 for my project,

this is my requirement,

Vin=5V

Vout = 3.8V

Iout = 1.6A

Ta= 70C

based on datasheet, i have done some calculations,

part has RθJA = 56.9 °C/W, if we calculate the Pd(max) of this part,

Pd(max) = Tj(max)-Ta)/ RθJA

= (125-70)/56.9

= 0.966W

As per our requirements, Power dissipation will be,

Pd = (Vout-Vin)*Iout

= (5-3.8)*1.6

= 1.92W

is my calculations are proper? With the calculation i have conculded that i cant use this part.

Do you have any suggested part?

Regards,

Hareesh

10 months ago

0 Bobby 10 months ago

TI__Intellectual 2670 points

Hi Hareesh,

Your calculations are correct.

Also, if you know your board temperature, using RθJB would help to get to a solution easily.

As per the conditions given, RθJA ≤ 28.645 °C/W. Do you have any additional requirements other than the ones mentioned in the post (like Noise, PSRR etc.)?

https://www.ti.com/power-management/linear-regulators-ldo/products.html

This is a link to the tool available in TI website which lists the available LDOs. You can use the filters (this includes RθJA) to get the part that can be used.

https://www.ti.com/power-management/linear-regulators-ldo/products.html#2277=19%3B29&451max=2%3B7.5&634max=3.7%3B125&

With this link, I have filtered the devices based on the conditions that you had mentioned.

Regards,

Bobby

0 Hareesh p 10 months ago

Prodigy 30 points

Hi Bobby,

thanks for the response,

One more doubt.

In thermal information, there are two version NTT & NDE, What are those?

Regards,

hareesh

+1 Bobby 10 months ago in reply to Hareesh p

TI__Intellectual 2670 points

Hi Hareesh,

This should have been mentioned more prominently in the datasheet.

But KTT is the package name for DDPAK/ TO-263, and NDE is the package name for TO-220.

This is listed on page 23 of the LM1085 datasheet.

If you need to know the physical dimensions of the package, they are listed on pages 28 and 29 of the datasheet.

Regards,

Bobby

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TPS7A92: tps7a92