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AME8853AAIU120K Datasheet(PDF) 10 Page - Analog Microelectronics |
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AME8853AAIU120K Datasheet(HTML) 10 Page - Analog Microelectronics |
10 / 29 page AME 10 High PSRR, Low Noise, 300mA CMOS Regulator AME8853A Rev.C.01 The AME8853A 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 AME8853A 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 pull-low. When activated pulled low, the MOS pass transistor shuts off, and all internal cir- cuits are powered down. In this state, the stand by cur- rent is less than 1 µA. n Detailed Description Capacitor Selection and Regulator Stability The maximum output power of the AME8853A is lim- ited 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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