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AAT3242ITP-TI-T1 Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT3242ITP-TI-T1 Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
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10 / 16 page  AAT3242 300mA/150mA Dual CMOS LDO Linear Regulator 10 3242.2005.01.1.4 Applications Information To assure the maximum possible performance is obtained from the AAT3242, please refer to the fol- lowing application recommendations. Input Capacitor Typically a 1µF or larger capacitor is recommend- ed for CIN in most applications. A CIN capacitor is not required for basic LDO regulator operation. However, if the AAT3242 is physically located more than three centimeters from an input power source, a CIN capacitor will be needed for stable operation. CIN should be located as closely to the device VIN pin as practically possible. CIN values greater than 1µF will offer superior input line transient response and will assist in maximizing the highest possible power supply ripple rejection. Ceramic, tantalum, or aluminum electrolytic capac- itors may be selected for CIN. There is no specific capacitor ESR requirement for CIN. However, for 300mA LDO regulator output operation, ceramic capacitors are recommended for CIN due to their inherent capability over tantalum capacitors to with- stand input current surges from low impedance sources such as batteries in portable devices. Output Capacitor For proper load voltage regulation and operational stability, a capacitor is required between pins VOUT and GND. The COUT capacitor connection to the LDO regulator ground pin should be made as direct as practically possible for maximum device per- formance. The AAT3242 has been specifically designed to function with very low ESR ceramic capacitors. For best performance, ceramic capaci- tors are recommended. Typical output capacitor values for maximum out- put current conditions range from 1µF to 10µF. Applications utilizing the exceptionally low output noise and optimum power supply ripple rejection characteristics of the AAT3242 should use 2.2µF or greater for COUT. If desired, COUT may be increased without limit. In low output current applications where output load is less than 10mA, the minimum value for COUT can be as low as 0.47µF. Capacitor Characteristics Ceramic composition capacitors are highly recom- mended over all other types of capacitors for use with the AAT3242. Ceramic capacitors offer many advantages over their tantalum and aluminum elec- trolytic counterparts. A ceramic capacitor typically has very low ESR, is lower cost, has a smaller PCB footprint, and is non-polarized. Line and load tran- sient response of the LDO regulator is improved by using low ESR ceramic capacitors. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. Equivalent Series Resistance ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resistance associated with a capacitor that includes lead resistance, internal connections, size and area, material composition, and ambient tem- perature. Typically, capacitor ESR is measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. Ceramic Capacitor Materials Ceramic capacitors less than 0.1µF are typically made from NPO or COG materials. NPO and COG materials are typically tight tolerance and are very stable over temperature. Larger capacitor values are typically composed of X7R, X5R, Z5U, and Y5V dielectric materials. Large ceramic capaci- tors, typically greater than 2.2µF, are often avail- able in the low-cost Y5V and Z5U dielectrics. These two material types are not recommended for use with LDO regulators since the capacitor toler- ance can vary more than ±50% over the operating temperature range of the device. A 2.2µF Y5V capacitor could be reduced to 1µF over tempera- |
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