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AAT4682IGU-T1 Datasheet(PDF) 7 Page - Advanced Analog Technology, Inc. |
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AAT4682IGU-T1 Datasheet(HTML) 7 Page - Advanced Analog Technology, Inc. |
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7 / 10 page  AAT4682 Dual Electronic Resettable Switch 4682.2006.05.1.2 7 Functional Description The AAT4682 is a dual channel electronic reset- table fuse that protects against short-circuit condi- tions by current limiting to a preset level. A patent- ed fast acting current limit loop limits load current in a fraction of a microsecond and instantly resets back to a low impedance state once the short-cir- cuit condition is removed. A current limit condition is reported by the open drain FAULT output after a two millisecond blanking interval. The blanking prevents false reporting during the charging of a capacitive load, which typically occurs when a load is connected. The AAT4682 is internally protected from thermal damage by an over-temperature detection circuit. If the die temperature reaches the internal thermal limit, both power devices are 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. Due to the high thermal con- ductivity of silicon and the size of the die, the tem- perature across the die is relatively uniform at high temperatures; therefore, as a precaution, both power devices are switched off when the thermal threshold is reached. The AAT4682 operates with input voltages ranging from 1.8V 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 1.8V, the AAT4682 internal MOSFETs are protected from entering the saturated region of operation by being automatically shut down by an under-voltage lock- out circuit. The AAT4682 is ideally suited for protection of peripheral ports such as USB, RS232, and parallel ports. Functional Block Diagram INA OUTB FAULTB ILIM OTMP UVLO ILIM OUTB FAULTA GND 3ms Blanking 3ms Blanking |
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