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AME8816AEDV500 Datasheet(PDF) 6 Page - Analog Microelectronics |
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AME8816AEDV500 Datasheet(HTML) 6 Page - Analog Microelectronics |
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6 / 14 page  AME, Inc. 6 1.5A CMOS LDO AME8816 n n n n n Detailed Description The AME8816 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 140oC, or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal op- eration is restored when the junction temperature drops below 120oC. The AME8816 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal op- eration is restored when the load resistance exceeds 0.75 ohms. 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 External Capacitors The AME8816 is stable with an output capacitor to ground of 4.7 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 comparatively expen- sive. 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 input and ground to stabilize Vin. The input capacitor should be at least 0.1 µF to have a beneficial effect. 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. n n n n n Enable When 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. 100Kohm resistor is necessary between V EN source and EN pin when V EN is higher than VIN. Note: There is no internal pull-up for EN PIN. n n n n n Adjustable Version The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to 5.0V. Vadj is trimmed to 1.242V and VOUT is given by the equation: VOUT = Vadj ( 1 + R1 / R2 ) Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1 + R2 will reduce stability. In general, R1 and R2 in the 10’s of k Ω will produce adequate stability, given reasonable lay- out precautions. To improve stability characteristics, keep |
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