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TPPM0303D Datasheet(PDF) 7 Page - Texas Instruments |
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TPPM0303D Datasheet(HTML) 7 Page - Texas Instruments |
7 / 10 page 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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