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AAT3258ITS-3.0-R-T1 Datasheet(PDF) 11 Page - Advanced Analog Technology, Inc. |
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AAT3258ITS-3.0-R-T1 Datasheet(HTML) 11 Page - Advanced Analog Technology, Inc. |
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11 / 16 page  LDO Regulator Applications Input Capacitor Typically, a 1µF or larger capacitor is recommend- ed for C IN in most applications. A C IN capacitor is not required for basic LDO regulator operation. However, if the AAT3258 is physically located more than three centimeters from an input power source, a C IN capacitor will be needed for stable operation. C IN should be located as closely to the device VIN pin as practically possible. C IN 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 capaci- tors may be selected for C IN. There is no specific capacitor ESR requirement for C IN. However, for 300mA LDO regulator output operation, ceramic capacitors are recommended for C IN 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 V OUT and GND. The C OUT capacitor connection to the LDO regulator ground pin should be made as direct as practically possible for maximum device performance. The AAT3258 has been specifically designed to func- tion with very low ESR ceramic capacitors. For best performance, ceramic capacitors are recommended. Typical output capacitor values for maximum output current conditions range from 1µF to 10µF. Applications utilizing the exceptionally low output noise and optimum power supply ripple rejection characteristics of the AAT3258 should use 2.2µF or greater for C OUT. If desired, COUT may be increased without limit. In low output current applications where output load is less than 10mA, the minimum value for C OUT can be as low as 0.47µF. AAT3258 300mA LDO Linear Regulator with µP Reset 3258.2006.03.1.6 11 The microprocessor reset section monitors the supply voltage to a microprocessor and asserts a reset sig- nal whenever the V DET voltage falls below a factory- programmed threshold. This threshold is accurate within +/-1.5% at 25°C. The reset signal remains asserted for a minimum of 150ms after V DET has risen above the threshold, as shown in Figure 1. To assure the maximum possible performance is obtained from the AAT3258, please refer to the fol- lowing application recommendations. Figure 1: Reset Signal Assertion. V RESET DET V TH V TH V TH t RDY t RDY |
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