LM2653_05 datasheet(4/12 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).

Typical Performance Characteristics

Efficiency vs Load Current

IN = 5V, VOUT = 2.5V)

Q vs VIN

10104922

10104904

QSD vs Input Voltage

QSD vs Junction Temperature

10104925

10104926

Frequency vs Junction Temperature

SW(ON) vs Input Voltage

10104907

10104923

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