Question, i.MX283 thermal characteristic

[Aemj]

Dear team,

I would like to ask about the thermal characteristic of i.MX283.

My customer is evaluating MCIMX283DVM4B on his board and has a question on the thermal characteristics of i.MX28.

In their test, the temperature of i.MX28 surface reached 64 degrees C when the environmental temperature was 25 degrees C.

At that time, the usage rate of i.MX283 was 50%.

CH	Simbol	measurement point	Temp. Deg.C	Estimated DegC in 45 DegC of environmental	Max.Ratings
CH1	U1	surface of i.MX283	63.8	84.1	70

The power consumption of DC24V on the board is 140-150mA.

Is that reasonable?

Do you have any ideas to lower the temperature?

Estimated temp number in the 45 degrees C of the environmental temp is 84 degrees C, and the number exceeds the maximum ratings.

The customer has a doubt whether the temp really can reach to 64℃ even when the usage rate was 50%.

Thanks,

Miyamoto

[igorpadykov · Accepted solution]

Hi AVNET JAPAN FAE

this depends on many factors, in particular how i.MX28 is powered.

If it is powered from 5V then I think it can easily reach such temperature:

5V*0.15A=0.75W  RθJA=36C/W , "four layer board (2s2p)" (Table 21 IMX28CEC )

delta T = 0.75W * 36C/W= 27C --> 25 +27 =52C

For minimizing temperature it is recommended to use power from DCDC_BATT.

Best regards

igor