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AAT4680IGV-T1 Schematic ( PDF Datasheet ) - Advanced Analogic Technologies

Teilenummer AAT4680IGV-T1
Beschreibung Electronic Resettable Fuse
Hersteller Advanced Analogic Technologies
Logo Advanced Analogic Technologies Logo 




Gesamt 8 Seiten
AAT4680IGV-T1 Datasheet, Funktion
General Description
The AAT4680 Electronic Resettable Fuse is part of
the AnalogicTech Application Specific Power MOS-
FET (ASPM™) line of products. It is a 1A current
limited P-channel MOSFET power device that
remains fully enhanced as long as the input power
supply is above an under voltage lockout thresh-
old, and the load is below the current limit setting.
If the load increases above the current limit setting,
as is the case during a short circuit, the MOSFET
effectively becomes a constant current source
equal to the current limit. If the current limit condi-
tion persists long enough to heat the MOSFET to
an extreme temperature, the device will thermal
cycle off and on until the current limit condition is
removed. An open drain FAULT flag signals an
over current or over temperature condition.
Quiescent current is typically a low 10µA.
The AAT4680 is available in a 5-pin SOT-23, spec-
ified over a -40 to 85°C temperature range.
AAT4680
Electronic Resettable Fuse
Features
SmartSwitch
• 500mA steady state load current
• 600mA minimum current limit trip point
• Low quiescent current, typically 10µA
• Over temperature protection
• Fast transient response:
• < 1µs response to short circuit
• 400mtypical RDS(ON)
• Undervoltage Lockout
• Temp range -40 to 85°C
• FAULT flag with 3ms blanking
• 5-pin SOT23 package
Applications
• USB ports
• Peripheral ports
• Desktop PCs
• Cell phone ports
Typical Application
INPUT
CIN
1µF
GND
5 IN
1
OUT
AAT4680
FAULT 3
GND
2
FAULT
OUT
COUT
1µF
GND
4680.2001.11.0.91
1






AAT4680IGV-T1 Datasheet, Funktion
Functional Block Diagram
AAT4680
Electronic Resettable Fuse
IN
Under-Voltage
Lockout
Over-Temp
Protection
OUT
Current
Limit
FAULT
3ms Blanking
GND
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. The blanking prevents false
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
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
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. In cases where the input voltage
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.
6 4680.2001.11.0.91

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