AAT4680_06 ANALOGICTECH [Advanced Analogic Technologies], AAT4680_06 Datasheet - Page 7

• Manufacturer Part Number: AAT4680_06
• Description: Electronic Resettable Fuse
• Manufacturer: ANALOGICTECH [Advanced Analogic Technologies]

Functional Description
The AAT4680 is a single 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 to
low impedance once the short-circuit condition is
removed. A current limit condition is reported by the
open drain FAULT output after a three millisecond
blanking interval.
reporting during the charging of a capacitive load,
which typically occurs when a load is connected.
The AAT4680 is internally protected from thermal
damage by an over-temperature detection circuit.
If the die temperature reaches the internal thermal
Functional Block Diagram
4680.2006.05.1.2
The blanking prevents false
IN
Under-Voltage
Lockout
3ms Blanking
Over-Temperature
Protection
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 indefinite-
ly until the over-current condition is removed. The
AAT4680 operates with input voltages ranging from
1.8V to 5.5V which, along with extremely low oper-
ating current, makes it ideal for battery-powered
applications.
drops below 1.8V, the AAT4680 internal MOSFET
is protected from entering the saturated region of
operation by being automatically shut down by an
under-voltage lockout circuit.
The AAT4680 is ideally suited for protection of peri-
pheral ports such as USB, RS232, and parallel
ports.
Current
Limit
GND
Electronic Resettable Fuse
In cases where the input voltage
OUT
FAULT
AAT4680
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