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AAT3220IGY-2.0-T1 Datasheet(PDF) 11 Page - Advanced Analog Technology, Inc. |
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AAT3220IGY-2.0-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 AAT3220 are T J(MAX), the maxi- mum junction temperature for the device which is 125°C and Θ JA = 200°C/W, the package thermal resistance. Typically, maximum conditions are cal- culated 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 pack- age power dissipation is 200mW. At T A = 25°C, the maximum package power dissipation is 500mW. The maximum continuous output current for the AAT3220 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 inter- nal die temperature would increase. If the condition remained constant and the short-circuit protection did not activate, there would be a potential damage hazard to the LDO regulator since the thermal pro- tection circuit will only activate after a short-circuit 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 AAT3220 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 AAT3220 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 AAT3220, 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 AAT3220 set for a 3.0V output at 85°C: VIN(MAX) = VOUT = 3.0V IOUT = 150mA IGND = 1.1µA VIN(MAX) = 4.33V 200mW + (3.0V × 150mA) 150mA + 1.1µA VIN(MAX) = VOUT = 3.0V IOUT = 150mA IGND = 1.1µA VIN(MAX) = > 5.5V 500mW + (3.0V × 150mA) 150mA + 1.1µA 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 AAT3220 150mA NanoPower™ LDO Linear Regulator 3220.2006.01.1.4 11 |
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