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AME8808IECS Datasheet(PDF) 6 Page - Analog Microelectronics |
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AME8808IECS Datasheet(HTML) 6 Page - Analog Microelectronics |
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6 / 11 page  Analog Microelectronics, Inc. 6 750mA CMOS LDO AME8808 n n n n n Detailed Description The AME8808 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal pro- tection circuits. During normal operation, the error am- plifier compares the output voltage to a precision refer- ence. Over-current and Thermal shutdown circuits be- come active when the junction temperature exceeds 150oC, or the current exceeds 750mA. During thermal shutdown, the output voltage remains low. Normal op- eration is restored when the junction temperature drops below 120oC. The AME8808 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The AME8808 also incorporates current foldback to reduce power dissipation when the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts. n n n n n External Capacitors The AME8806/8809 is stable with an output capacitor to ground of 2.2 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. Unfortunately, large value ceramic capacitors are com- paratively 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 over- all cost. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1 µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection. n n n n n Enable The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1 µA. This pin behaves much like an electronic switch. |
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