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AME8812KEEV Datasheet(PDF) 7 Page - Analog Microelectronics |
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AME8812KEEV Datasheet(HTML) 7 Page - Analog Microelectronics |
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7 / 14 page  Analog Microelectronics, Inc. 7 AME8801/8812/8840 300mA CMOS LDO n n n n n Detailed Description The AME8801/8840 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error ampli- fier, 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 300mA. During thermal shutdown, the output voltage remains low. Normal op- eration is restored when the junction temperature drops below 120oC. The AME8801/8840 switches from voltage mode to cur- rent mode when the load exceeds the rated output cur- rent. This prevents over-stress. The AME8801/8840 also incorporates current foldback to reduce power dis- sipation when the output is short circuited. This feature becomes active when the output drops below 0.8volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts. A third capacitor can be connected between the BY- PASS pin and GND. This capacitor can be a low cost Polyester Film variety between the value of 0.001 ~ 0.01 µF. A larger capacitor improves the AC ripple re- jection, but also makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges. 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. n n n n n External Capacitors The AME8801/8840 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. |
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