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AAT4618IJS-0.5-T1 Datasheet(PDF) 7 Page - Advanced Analogic Technologies |
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AAT4618IJS-0.5-T1 Datasheet(HTML) 7 Page - Advanced Analogic Technologies |
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7 / 11 page  Functional Block Diagram IN OUT ON (ON) GND Under-Voltage Lockout Over-Temperature Protection Current Limit FAULT 4ms Delay AAT4618 Current Limited Load Switch 4618.2006.05.1.2 7 Functional Description The AAT4618 is a single channel current limited load switch that protects against short circuits by current limiting to a preset level. A patented fast- acting current limit loop limits the current in a frac- tion of a microsecond and instantly resets to low impedance once the short-circuit condition is removed. The AAT4618 is internally protected from thermal damage by an over-temperature detection circuit. If the die temperature reaches the internal thermal limit, the power device is switched off until the die temperature cools to a level below the thermal limit threshold. The device will thermal cycle indefinitely until the over-current condition is removed. The AAT4618 operates with input voltages ranging from 2.4V to 5.5V which, along with its extremely low operating current, makes it ideal for battery-powered applications. In cases where the input voltage drops below 2.4V, the AAT4618 MOSFET is protected from entering the saturated region of operation by being auto- matically shut down by an under-voltage lockout circuit. A current limit condition is reported by the open drain FAULT output. A 4ms blanking interval prevents false reporting during the charging of a capacitive load, which typically occurs during device turn-on, but may also occur during a port hot plug-in event. The AAT4618 is ideally suited for protection of peripheral ports such as USB, RS232, and parallel ports. |
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