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AAT3218IJS-3.3-T1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies |
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AAT3218IJS-3.3-T1 Datasheet(HTML) 8 Page - Advanced Analogic Technologies |
8 / 18 page AAT3218 150mA MicroPower™ High Performance LDO 8 3218.2006.04.1.8 Functional Description The AAT3218 is intended for LDO regulator appli- cations where output current load requirements range from no load to 150mA. The advanced cir- cuit design of the AAT3218 has been specifically optimized for very fast start-up and shutdown tim- ing. This proprietary CMOS LDO has also been tailored for superior transient response characteris- tics. These traits are particularly important for applications that require fast power supply timing, 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 behavior of fundamental control and feedback circuits within the LDO regulator. Fast turn-off response time is achieved by an active output pull-down circuit, which is enabled when the LDO regulator is placed in shutdown mode. This active fast shutdown circuit has no adverse effect on normal device operation. The AAT3218 has very fast transient response characteristics, which is an important feature for applications where fast line and load transient response are required. This rapid transient response behavior is accomplished through the implementation of an active error amplifier feed- back control. This proprietary circuit design is unique to this MicroPower LDO regulator. The LDO regulator output has been specifically optimized to function with low-cost, low-ESR ceramic capacitors. However, the design will allow for operation over a wide range of capacitor types. A bypass pin has been provided to allow the addi- tion 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 to this pin. However, increased CBYPASS values 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 gives 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 section of this datasheet for details on device operation at maxi- mum 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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