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AAT3201IGV-2.8-T1 Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT3201IGV-2.8-T1 Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
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10 / 15 page  AAT3201 150mA OmniPower™ LDO Linear Regulator 10 3201.2006.01.1.2 Ceramic Capacitor Materials: Ceramic capacitors less than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials generally have tight tolerance and are very stable over tem- perature. Larger capacitor values are usually com- posed of X7R, X5R, Z5U, or Y5V dielectric materi- als. Large ceramic capacitors (i.e., greater than 2.2µF) are often available in low-cost Y5V and Z5U dielectrics. These two material types are not recom- mended for use with LDO regulators since the capac- itor tolerance can vary more than ±50% over the operating temperature range of the device. A 2.2µF Y5V capacitor could be reduced to 1µF over the full operating temperature range. This can cause prob- lems for circuit operation and stability. X7R and X5R dielectrics are much more desirable. The tempera- ture tolerance of X7R dielectric is better than ±15%. Capacitor area is another contributor to ESR. Capacitors that are physically large in size will have a lower ESR when compared to a smaller sized capacitor of equivalent material and capacitance value. These larger devices can also improve cir- cuit transient response when compared to an equal value capacitor in a smaller package size. Consult capacitor vendor datasheets carefully when selecting capacitors for use with LDO regulators. Enable Function The AAT3201 features an LDO regulator enable / disable function. This pin (EN) is active high and is compatible with CMOS logic. To assure the LDO regulator will switch on, the EN turn-on control level must be greater than 2.4V. The LDO regulator will go into the disable shutdown mode when the volt- age on the EN pin falls below 0.6V. If the enable function is not needed in a specific application, it may be tied to V IN to keep the LDO regulator in a continuously on state. Short-Circuit and Thermal Protection The AAT3201 is protected by both current limit and over-temperature protection circuitry. The internal short-circuit current limit is designed to activate when the output load demand exceeds the maxi- mum rated output. If a short-circuit condition were to continually draw more than the current limit threshold, the LDO regulator's output voltage would drop to a level necessary to supply the current demanded by the load. Under short-circuit or other over-current operating conditions, the output volt- age would drop and the AAT3201's die temperature would rapidly increase. Once the regulator's power dissipation capacity has been exceeded and the internal die temperature reaches approximately 140°C the system thermal protection circuit will become active. The internal thermal protection cir- cuit will actively turn off the LDO regulator output pass device to prevent the possibility of over-tem- perature damage. The LDO regulator output will remain in a shutdown state until the internal die temperature falls back below the 140°C trip point. The interaction between the short-circuit and ther- mal protection systems allows the LDO regulator to withstand indefinite short-circuit conditions without sustaining permanent damage. No-Load Stability The AAT3201 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. An output capacitor is required for stability under no-load operating conditions. Refer to the Output Capacitor section of this datasheet for rec- ommended typical output capacitor values. Thermal Considerations and High Output Current Applications The AAT3201 is designed to deliver a continuous output load current of 150mA under normal operat- ing conditions. The limiting characteristic for the maximum output load safe operating area is essen- tially package power dissipation and the internal pre- set thermal limit of the device. In order to obtain high operating currents, careful device layout and circuit operating conditions need to be taken into account. The following discussions will assume the LDO reg- ulator is mounted on a printed circuit board utilizing the minimum recommended footprint and the print- ed circuit board is 0.062-inch thick FR4 material with one ounce copper. |
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