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ADC3424: Case temparture

Taku Murayama
Intellectual 1260 points
Part Number: ADC3424
The definition of the temperature range is defined as 140-85 ℃ in TA(air). What is the definition of TC (Case Temperature)? At present, thermal analysis simulations have shown that the case temperature (TC) of the ADC slightly exceeds 85°C.
  • 0
    TI__Mastermind 25660 points

    Hi Taku-san,

    Case temperature for a QFN would mean at the power pad – as this is the thermal path from the chip to the board.

    The Tj rating in the datasheet (e.g. 105 degC max) then you can calculate the die temp based on the estimated case (pad) temp or board temp

    For example,

    Psi-JB is 3.3 degC/W so if the board under the pad is 85 degC then the Tj will be (roughly) == [ 85 degC + ( 3.3 degC/W * 0.475W ) ] = 86.6 degC which is below 105 degC, so no concern

    Please review Table 7.4 and the SPRA953 document, snapshot below, to determine if their thermal care-abouts are being met.

    Regards,

    Rob