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AAT3242ITP-QT-T1 Datasheet(PDF) 11 Page - Advanced Analog Technology, Inc. |
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AAT3242ITP-QT-T1 Datasheet(HTML) 11 Page - Advanced Analog Technology, Inc. |
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11 / 16 page  AAT3242 300mA/150mA Dual CMOS LDO Linear Regulator 3242.2006.04.1.10 11 of X7R dielectric is better than ±15%. Capacitor area is another contributor to ESR. Capacitors which are physically large in size will have a lower ESR when compared to a smaller sized capacitor of an equivalent material and capacitance value. These larger devices can improve circuit transient response when compared to an equal value capac- itor in a smaller package size. Consult capacitor vendor datasheets carefully when selecting capac- itors for LDO regulators. POK Output The AAT3242 features integrated Power OK com- parators which can be used as an error flag. The POK open drain output goes low when output volt- age is 6% (typ) below its nominal regulation volt- age. Additionally, any time one of the regulators is in shutdown, the respective POK output is pulled low. Connect a pull-up resistor from POKA to OUTA, and POKB to OUTB. Enable Function The AAT3242 features an LDO regulator enable/dis- able function. Each LDO has its own dedicated enable pin. These pins (EN) are active high and are compatible with CMOS logic. To assure the LDO regulators will switch on, ENA/B must be greater than 1.6V. The LDO regulators will shut down when the voltage on the ENA/B pins falls below 0.6V. In shutdown, the AAT3242 will consume less than 1.0µA of current. If the enable function is not need- ed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. When the LDO regulators are in shutdown mode, an internal 20 Ω resistor is connected between VOUT and GND. This is intended to discharge COUT when the LDO regulators are disabled. The internal 20 Ω has no adverse effects on device turn-on time. Short-Circuit Protection The AAT3242 contains internal short-circuit protec- tion that will trigger when the output load current exceeds the internal threshold limit. Under short- circuit conditions, the output of the LDO regulator will be current limited until the short-circuit condi- tion is removed from the output or LDO regulator package power dissipation exceeds the device thermal limit. Thermal Protection The AAT3242 has an internal thermal protection cir- cuit which will turn on when the device die temper- ature exceeds 145°C. The LDO regulator output will remain in a shutdown state until the internal die temperature falls back below the 145°C trip point. The combination and interaction between the short- circuit and thermal protection systems allows the LDO regulators to withstand indefinite short-circuit conditions without sustaining permanent damage. No-Load Stability The AAT3242 is designed to maintain output volt- age regulation and stability under operational no- load conditions. This is an important characteristic for applications where the output current may drop to zero. Reverse Output-to-Input Voltage Conditions and Protection Under normal operating conditions, a parasitic diode exists between the output and input of the LDO reg- ulator. The input voltage should always remain greater than the output load voltage maintaining a reverse bias on the internal parasitic diode. Conditions where VOUT might exceed VIN should be avoided since this would forward bias the internal parasitic diode and allow excessive current flow into the VOUT pin, possibly damaging the LDO regulator. In applications where there is a possibility of VOUT exceeding VIN for brief amounts of time during nor- mal operation, the use of a larger value CIN capaci- tor is highly recommended. A larger value of CIN with respect to COUT will effect a slower CIN decay rate during shutdown, thus preventing VOUT from exceeding VIN. In applications where there is a greater danger of VOUT exceeding VIN for extended periods of time, it is recommended to place a Schottky diode across VIN to VOUT (connecting the cathode to VIN and anode to VOUT). The Schottky diode forward voltage should be less than 0.45V. |
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