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AAT3200IGY-2.8-T1 Datasheet(PDF) 11 Page - Advanced Analog Technology, Inc. |
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AAT3200IGY-2.8-T1 Datasheet(HTML) 11 Page - Advanced Analog Technology, Inc. |
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11 / 16 page  At any given ambient temperature (T A), the maxi- mum package power dissipation can be deter- mined by the following equation: Constants for the AAT3200 are T J(MAX), the maxi- mum junction temperature for the device (125°C) and Θ JA = 200°C/W, the SC59 thermal resistance. Typically, maximum conditions are calculated at the maximum operating temperature where T A = 85°C, under normal ambient conditions T A = 25°C. Given T A = 85°C, the maximum package power dissipa- tion is 200mW. At T A = 25°C, the maximum pack- age power dissipation is 500mW. The maximum continuous output current for the AAT3200 is a function of the package power dissi- pation and the input-to-output voltage drop across the LDO regulator. Refer to the following simple equation: For example, if V IN = 5V, VOUT = 3V, and TA = 25°C, I OUT(MAX) < 250mA. The output short-circuit protec- tion threshold is set between 150mA and 300mA. If the output load current were to exceed 250mA or if the ambient temperature were to increase, the internal die temperature will increase. If the condi- tion remained constant and the short-circuit protec- tion were not to activate, there would be a potential damage hazard to LDO regulator since the thermal protection circuit will only activate after a short-cir- cuit event occurs on the LDO regulator output. To determine the maximum input voltage for a given load current, refer to the following equation. This calculation accounts for the total power dissi- pation of the LDO regulator, including that caused by ground current. This formula can be solved for V IN to determine the maximum input voltage. The following is an example for an AAT3200 set for a 3.0V output: From the discussion above, P D(MAX) was deter- mined to equal 417mW at T A = 25°C. Thus, the AAT3200 can sustain a constant 3.0V output at a 150mA load current as long as V IN is ≤ 5.5V at an ambient temperature of 25°C. 5.5V is the maximum input operating voltage for the AAT3200, thus at 25°C, the device would not have any thermal concerns or operational V IN(MAX) limits. This situation can be different at 85°C. The follow- ing is an example for an AAT3200 set for a 3.0V output at 85°C: From the discussion above, P D(MAX) was deter- mined to equal 200mW at T A = 85°C. VIN(MAX) = VOUT = 3.0V IOUT = 150mA IGND = 20µA VIN(MAX) = 4.33V 200mW + (3.0V × 150mA) 150mA + 20µA VIN(MAX) = VOUT = 3.0V IOUT = 150mA IGND = 20µA VIN(MAX) > 5.5V 500mW + (3.0V × 150mA) 150mA + 20µA VIN(MAX) = PD(MAX) + (VOUT × IOUT) IOUT + IGND PD(MAX) = (VIN - VOUT)IOUT + (VIN × IGND) IOUT(MAX) < PD(MAX) VIN - VOUT PD(MAX) = TJ(MAX) - TA θJA AAT3200 OmniPower™ LDO Linear Regulator 3200.2006.02.1.4 11 |
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