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AAT3221IJS-2.8-T1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies |
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AAT3221IJS-2.8-T1 Datasheet(HTML) 8 Page - Advanced Analogic Technologies |
8 / 16 page AAT3221/2 150mA NanoPower™ LDO Linear Regulator PowerLinearTM PRODUCT DATASHEET 8 3221.2007.11.1.12 www .analogictech.com Functional Description The AAT3221 and AAT3222 are intended for LDO regula- tor 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 management 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 por- table products. In the shutdown state, the LDO draws less than 1μA from input supply. The LDO also demonstrates excellent power supply rip- ple rejection (PSRR) and load and line transient 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 battery 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 inter- nal protection circuits gives the AAT3221/2 a compre- hensive safety system to guard against extreme adverse operating conditions. Device power dissipation is limited to the package type and thermal dissipation properties. Refer to the Thermal Considerations section of this docu- ment for details on device operation at maximum output load levels. Functional Block Diagram Over-Current Protection Over-Temperature Protection VREF IN EN OUT GND |
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