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AAT3221IJS-3.2-T1 Datasheet(PDF) 9 Page - Advanced Analog Technology, Inc. |
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AAT3221IJS-3.2-T1 Datasheet(HTML) 9 Page - Advanced Analog Technology, Inc. |
9 / 18 page AAT3221/2 150mA NanoPower™ LDO Linear Regulator 3221.2005.12.1.11 9 Functional Block Diagram Over-Current Protection Over-Temperature Protection VREF IN EN OUT GND Functional Description The AAT3221 and AAT3222 are intended for LDO regulator applications where output current load requirements range from no load to 150mA. The advanced circuit design of the AAT3221/2 has been optimized for very low quiescent or ground current consumption, making it ideal for use in power man- agement systems for small battery-operated devices. The typical quiescent current level is just 1.1µA. AAT3221/2 devices also contain an enable circuit which has been provided to shut down the LDO regulator for additional power conservation in portable products. In the shutdown state, the LDO draws less than 1µA from input supply. The LDO also demonstrates excellent power sup- ply ripple rejection (PSRR) and load and line tran- sient response characteristics. The AAT3221/2 high performance LDO regulator is especially well suited for circuit applications that are sensitive to load circuit power consumption and extended bat- tery life. The LDO regulator output has been specifically optimized to function with low-cost, low-ESR ceramic capacitors. However, the design will allow for operation with a wide range of capacitor types. The AAT3221/2 has complete short-circuit and thermal protection. The integral combination of these two internal protection circuits gives the AAT3221/2 a comprehensive safety system to guard against extreme adverse operating condi- tions. Device power dissipation is limited to the package type and thermal dissipation properties. Refer to the Thermal Considerations section of this document for details on device operation at maxi- mum output load levels. |
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