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AME8852A-AEU420K Datasheet(PDF) 7 Page - Analog Microelectronics |
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AME8852A-AEU420K Datasheet(HTML) 7 Page - Analog Microelectronics |
7 / 20 page AME 7 AME8852A Rev. C.01 High PSRR, LowNoise, 150mA CMOS Regulator The AME8852A 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 150mA. 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 AME8852A 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. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Un- fortunately, large value ceramic capacitors are compara- tively expensive. One option is to parallel a 0.1 µF ce- ramic 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 than 1 µA. n Detailed Description Capacitor Selection and Regulator Stability The maximum output power of the AME8852 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 = (VIN(MAX)-VOUT) x IOUT Where: V IN(MAX) = maximum input voltage P MAX = maximum power dissipation of the package |
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