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AAT3215IGV-25-T1 Datasheet(PDF) 11 Page - Advanced Analogic Technologies |
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AAT3215IGV-25-T1 Datasheet(HTML) 11 Page - Advanced Analogic Technologies |
11 / 16 page AAT3215 150mA CMOS High Performance LDO 3215.2002.03.0.91 11 Applications Information VOUT = 2.5 volts IOUT = 150mA IGND = 150uA VIN(MAX)=(211mW+(2.5Vx150mA))/(150mA +150uA) VIN(MAX) = 3.90V Higher input to output voltage differentials can be obtained with the AAT3215, while maintaining device functions within the thermal safe operating area. To accomplish this, the device thermal resistance must be reduced by increasing the heat sink area or by operating the LDO regulator in a duty cycled mode. For example, an application requires VIN = 4.2V while VOUT = 2.5V at a 150mA load and TA = 85°C. VIN is greater than 3.90V, which is the maximum safe continuous input level for VOUT = 2.5V at 150mA for TA = 85°C. To maintain this high input voltage and output current level, the LDO regulator must be operated in a duty cycled mode. Refer to the following calculation for duty cycle operation: PD(MAX) is assumed to be 211mW IGND = 150µA IOUT = 150mA VIN = 4.2 volts VOUT = 2.5 volt %DC=100(PD(MAX)/((VIN-VOUT)IOUT+(VINxIGND)) %DC=100(211mW/((4.2V-2.5V)150mA+(4.2Vx150µA)) %DC = 85.54% For a 150mA output current and a 2.7volt drop across the AAT3215 at an ambient temperature of 85°C, the maximum on time duty cycle for the device would be 85.54%. The following family of curves show the safe oper- ating area for duty cycled operation from ambient room temperature to the maximum operating level. Device Duty Cycle vs. V DROP V OUT = 2.5V @ 85 C 0 0.5 1 1.5 2 2.5 3 3.5 0 10203040 50 60 70 80 90 100 Duty Cycle (%) 200mA 150mA 100mA Device Duty Cycle vs. V DROP V OUT= 2.5V @ 50 C 0 0.5 1 1.5 2 2.5 3 3.5 0 10203040 50 60 70 80 90 100 Duty Cycle (%) 200mA 150mA Device Duty Cycle vs. VDROP VOUT = 2.5V @ 25 C 0 0.5 1 1.5 2 2.5 3 3.5 0 10203040 50 60 70 80 90 100 Duty Cycle (%) 200mA |
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