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AAT3218IJS-2.85-T1 Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers |
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AAT3218IJS-2.85-T1 Datasheet(HTML) 8 Page - List of Unclassifed Manufacturers |
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8 / 18 page  AAT3218 150mA MicroPower™ High Performance LDO 8 3218.2004.02.1.0 Functional Description The AAT3218 is intended for LDO regulator applica- tions where output current load requirements range from no load to 150mA. The advanced circuit design of the AAT3218 has been specifically optimized for very fast start-up and shutdown timing. This proprietary CMOS LDO has also been tailored for superior transient response characteristics. These traits are particularly important for applications, which require fast power supply tim- ing, such as GSM cellular telephone handsets. The high-speed turn-on capability of the AAT3218 is enabled through the implementation of a fast start control circuit, which accelerates the power up behav- ior of fundamental control and feedback circuits with- in the LDO regulator. Fast turn-off time response is achieved by an active output pull down circuit, which is enabled when the LDO regulator is placed in the shutdown mode. This active fast shutdown circuit has no adverse effect on normal device operation. The AAT3218 has very fast transient response char- acteristics, which is an important feature for applica- tions where fast line and load transient response is required. This rapid transient response behavior is accomplished through the implementation of an active error amplifier feedback control. This propri- etary circuit design is unique to this MicroPower™ LDO regulator. The LDO regulator output has been specifically opti- mized to function with low cost, low ESR ceramic capacitors. However, the design will allow for opera- tion over a wide range of capacitor types. A bypass pin has been provided to allow the addition of an optional voltage reference bypass capacitor to reduce output self noise and increase power supply ripple rejection. Device self noise and PSRR will be improved by the addition of a small ceramic capacitor in this pin. However, increased values of CBYPASS may slow down the LDO regulator turn-on time. This LDO regulator has complete short circuit and thermal protection. The integral combination of these two internal protection circuits give the AAT3218 a comprehensive 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 discussion in the section for details on device operation at maximum output current loads. Functional Block Diagram Error Amplifier Over-Current Protection Over- Temperature Protection Voltage Reference + - IN EN BYP OUT GND Active Feedback Control Fast Start Control |
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