LM2648 datasheet(7/23 Pages) NSC

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Electrical Characteristics (Continued)

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Range indicates conditions for which the device is

intended to be functional, but does not guarantee specfic performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

The guaranteed specifications apply only for the test conditions. Some performance characteristics may degrade when the device is not operated under the listed

test conditions.

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 1.3W rating results from using 125˚C, 25˚C, and 75˚C/W

for TJMAX,TA, and θJA respectively. A θJA of 75˚C/W represents the worst-case condition of no heat sinking of the 56-pin TSSOP. A thermal shutdown will occur if

the temperature exceeds the maximum junction temperature of the device.

θJC = 26˚C/W.

Note 3: For detailed information on soldering plastic small-outline packages, refer to the Packaging Databook available from National Semiconductor Corporation.

Note 4: For testing purposes, ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5k

Ω resistor.

Note 5: A typical is the center of characterization data measured with low duty cycle pulse tsting at TA = 25˚C. Typicals are not guaranteed.

Note 6: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with TA =TJ = 25˚C. All hot and cold limits

are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.

Note 7: All switching controllers are off. The linear regulator VLIN5 remains on.

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