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AME8833BEEV285Z Datasheet(PDF) 8 Page - Analog Microelectronics |
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AME8833BEEV285Z Datasheet(HTML) 8 Page - Analog Microelectronics |
8 / 14 page AME, Inc. 8 High PSRR, 150mA CMOS LDO AME8833/8834 The AME8833/8834 is stable with an output capacitor to ground of 0.22 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. A second capacitor is recommended between the in- put and ground to stabilize Vin. The input capacitor should be at least 1 µF to have a beneficial effect. A larger capacitor improves the AC ripple rejection, 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 Detailed Description n External Capacitors n Shutdown 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. The AME8833/8834 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 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 below 120oC. The AME8833/8834 switches from voltage mode to cur- rent mode when the load exceeds the rated output cur- rent. This prevents over-stress. The AME8833/8834 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 0.8volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts. n Adjustable Version AME8834 features a user-adjustable output through an external feedback resister divider. To set the output of AME8834 use the following equation: V OUT=VADJ(1+R1/R2) V ADJ=1.225V, use 1% or better resistors |
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