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TPPM0303D Datasheet(PDF) 7 Page - Texas Instruments

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No. de pieza TPPM0303D
Descripción Electrónicos  250-mA LOW-DROPOUT REGULATOR WITH AUXILIARY POWER MANAGEMENT
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TPPM0303D Datasheet(HTML) 7 Page - Texas Instruments

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TPPM0303
250-mA LOW-DROPOUT REGULATOR
WITH AUXILIARY POWER MANAGEMENT
SLVS364 – FEBRUARY 2001
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Trig?
Sample
20-mA to 250-mA
Step Load
3.3VOUT (Offset = 3.3 V)
Figure 9. 5VCC Load Transient Response Rising
THERMAL INFORMATION
To ensure reliable operation of the device, the junction temperature of the output device must be within the safe
operating area (SOA). This is achieved by having a means to dissipate the heat generated from the junction
of the output structure. There are two components that contribute to thermal resistance. They consist of two
paths in series. The first is the junction to case thermal resistance, RθJC; the second is the case to ambient
thermal resistance, RθCA. The overall junction to ambient thermal resistance, RθJA, is determined by:
RθJA = RθJC + RθCA
The ability to efficiently dissipate the heat from the junction is a function of the package style and board layout
incorporated in the application. The operating junction temperature is determined by the operating ambient
temperature, TA, and the junction power dissipation, PJ.
The junction temperature, TJ, is equal to the following thermal equation:
TJ = TA + PJ (RθJC) + PJ (RθCA)
TJ = TA + PJ (RθJA)
This particular application uses the 8-pin SO package with standard lead frame with a dedicated ground
terminal. Hence, the maximum power dissipation allowable for an operating ambient temperature of 70
°C, and
a maximum junction temperature of 150
°C is determined as:
PJ = (TJ – TA)/RθJA
PJ = (150 – 70)/176 = 0.45 W when using a low-K PCB.
PJ = (150 – 70)/98 = 0.81 W when using a high-K PCB.
Worst case maximum power dissipation is determined by:
PD = (5.5 – 3) × 0.25 = 0.625 W
Normal operating maximum power dissipation is (see Figure 10):
PD = (5 – 3.3) × 0.25 = 0.425 W


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