LM2653 datasheet(4/13 Pages) NSC

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Electrical Characteristics (Continued)

Note 2: The maximum allowable power dissipation is calculated by using PDMAX =(TJMAX −TA)/θJA, where TJMAX is the maximum junction temperature, TA is the

ambient temperature, and

θJA is the junction-to-ambient thermal resistance of the specified package. The 893 mW rating results from using 150˚C, 25˚C, and

140˚C/W for TJMAX,TA, and θJA respectively. A θJA of 140˚C/W represents the worst-case condition of no heat sinking of the 16-pin TSSOP package. Heat sinking

allows the safe dissipation of more power. The Absolute Maximum power dissipation must be derated by 7.14 mW per ˚C above 25˚C ambient. The LM2653 actively

limits its junction temperatures to about 165˚C.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin.

Note 4: Typical numbers are at 25˚C and represent the most likely norm.

Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100%

production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used

to calculate Average Outgoing Quality Level (AOQL).

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