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AME8805AEGTZ Datasheet(PDF) 8 Page - Analog Microelectronics |
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AME8805AEGTZ Datasheet(HTML) 8 Page - Analog Microelectronics |
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8 / 12 page  AME, Inc. 8 600mA CMOS LDO AME8805 / 8810 The AME8805/8810 family of CMOS regulators con- tain a PMOS pass transistor, voltage reference, error am- plifier, 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 150 oC, or the current exceeds 600mA. During thermal shutdown, the output voltage remains low. Normal op- eration is restored when the junction temperature drops below 120 oC. The AME8805/8810 switches from voltage mode to cur- rent mode when the load exceeds the rated output cur- rent. This prevents over-stress. The AME8805/8810 also incorporates current foldback to reduce power dissipa- tion when the output is short circuited. This feature be- comes 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 Detailed Description n External Capacitors The AME8805/8810 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. 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 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. |
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