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AME8853AET080K Datasheet(PDF) 10 Page - Analog Microelectronics |
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AME8853AET080K Datasheet(HTML) 10 Page - Analog Microelectronics |
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10 / 29 page  AME 10 High PSRR, Low Noise, 300mA CMOS Regulator AME8853 Rev. C.03 The AME8853 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection thermal shutdown, and Power Good detection circuitry. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal pro- tection circuits. During normal operation, the error ampli- fier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become ac- tive when the junction temperature exceeds 150oC, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is re- stored when the junction temperature drops more 20oC. Capacitor Selection and Regulator Stability The AME8853 is stable with an output capacitor to ground of 1 µF or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Con- versely, Aluminum Electrolytic capacitors exhibit the high- est ESR, resulting in the poorest AC response. Unfortu- nately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1 µF ceramic capacitor with a 10 µF Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the in- put and ground to stabilize V IN. The input capacitor should be at least 0.1 µF to have a beneficial effect. Enable Pin The Enable Pin is normally pull-high. When activated pulled low, the MOS pass transistor shuts off, and all internal circuits are powered down. In this state, the stand by current is less than 1 µA. n Detailed Description Capacitor Selection and Regulator Stability The maximum output power of the AME8853 is limited by the maximum power dissipation of the package. By calculation the power dissipation of the package as a function of the input voltage, output voltage and output current, the maximum input voltage can be obtained. The maximum power dissipation should not exceed the package ’s maximum power rating. P MAX = (V IN(MAX) -VOUT) x IOUT Where: V IN(MAX) = maximum input voltage P MAX = maximum power dissipation of the package |
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