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AAT4680IGV-T1 PDF 데이터시트 ( Data , Function )

부품번호 AAT4680IGV-T1 기능
기능 Electronic Resettable Fuse
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AAT4680IGV-T1 데이터시트, 핀배열, 회로
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 pdf, 반도체, 판매, 대치품
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA = 25°C)
Quiescent Current vs. Temperature
20
18
16
14
12
10
8
6
4
2
0
-40
-20
0 20 40 60 80 100 120
Temperature (°C)
AAT4680
Electronic Resettable Fuse
Quiescent Current vs. Input Voltage
12
10
8
6
4
2
0
012345
Input (V)
6
Current Limit vs. Output Voltage
1
0.8
0.6
0.4
0.2
0
0 123 45
Output (V)
Short Circuit Through 0.3
67
4 Input Voltage 5
2
0
-2
-0.5
0.0
3
Output Voltage
1
Output Current
0.5 1.0
Time (µs)
-1
1.5 2.0
4
RDS(ON) vs. Temperature
700
650
600
550
500
450
400
350
300
-40
-20
VIN=3V
VIN=5V
0 20 40 60
Temperature (°C)
80
100 120
Short Circuit Through 0.6
65
Input Voltage
43
Output Current
21
Output Voltage
0 -1
-0.5 0.0 0.5 1.0 1.5 2.0
Time (µs)
4680.2001.11.0.9

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AAT4680IGV-T1 전자부품, 판매, 대치품
Applications Information
Input Capacitor
The input capacitor, CIN, protects the power supply
from current transients generated by the load
attached to the AAT4680. If a short circuit is sud-
denly applied to the output of the AAT4680, there is
a 500 nanosecond long period during which a large
current can flow before current limit circuitry acti-
vates. (See characteristic curve "Short Circuit
Through 0.3.") In this event, a properly sized input
capacitor can dramatically reduce the voltage tran-
sient seen by the power supply and other circuitry
upstream from the AAT4680.
CIN should be located as close to the device VIN pin
as practically possible. Ceramic, tantalum or alu-
minum electrolytic capacitors may be selected for
CIN. There is no specific capacitor ESR requirement
for CIN. However, for higher current operation,
ceramic capacitors are recommended for CIN due to
their inherent capability over tantalum capacitors to
withstand input current surges from low impedance
sources such as batteries in portable devices.
Output Capacitor
In order to insure stability while current limit is
active, a small output capacitance of approximately
1µF is required. No matter how big the output
capacitor, output current is limited to the value set
by the AAT4680 current limiting circuitry, allowing
very large output capacitors to be used.
For example, USB ports are specified to have at
least 120µF of capacitance down stream from their
controlling power switch. The current limiting circuit
will allow an output capacitance of 1000µF or more
without disturbing the upstream power supply.
Attaching Loads
Capacitive loads attached to the AAT4680 will charge
at a rate no greater than the current limit setting.
FAULT Output
A FAULT flag is provided to alert a system if the
AAT4680 load is not receiving sufficient voltage to
operate properly. If current limit or over tempera-
ture circuits in any combination are active for more
than approximately three milliseconds, FAULT is
pulled to ground through approximately 100.
Removal of voltage or current transients of less
AAT4680
Electronic Resettable Fuse
than two milliseconds prevents capacitive loads
connected to the AAT4680 output from activating
the FAULT flag when they are initially attached.
Pull up resistances of 1kto 100kare recom-
mended. Since FAULT is an open drain terminal, it
may be pulled up to any voltage rail less than the
maximum operating voltage of 5.5V, allowing for
level shifting between circuits.
Thermal Considerations
Since the AAT4680 has internal current limit and
over temperature protection, junction temperature is
rarely a concern. However, if the application
requires large currents in a hot environment, it is
possible that temperature rather than current limit will
be the dominant regulating condition. In these appli-
cations, the maximum current available without risk
of an over temperature condition must be calculated.
The maximum internal temperature while current
limit is not active can be calculated using Equation 1.
TJ(MAX) = IMAX2 × RDS(ON)(MAX) × RθJA + TA(MAX)
In Equation 1, IMAX is the maximum current
required by the load. RDS(ON)(MAX) is the maxi-
mum rated RDS(ON) of the AAT4680 at high temper-
ature. RθJA is the thermal resistance between the
AAT4680 die and the board onto which it is mount-
ed. TA(MAX) is the maximum temperature that the
PCB under the AAT4680 would be if the AAT4680
were not dissipating power. Equation 1 can be
rearranged to solve for IMAX; Equation 2.
IMAX=
TSD(MIN) - TA(MAX)
RDS(ON)(MAX) × RθJA
TSD(MIN) is the minimum temperature required to
activate the AAT4680 over temperature protection.
With typical specification of 125°C, 115°C is a safe
minimum value to use.
For example, if an application is specified to oper-
ate in 50°C environments, the PCB operates at
temperatures as high as 85°C. The application is
sealed and its PCB is small, causing RθJA to be
approximately 150°C/W. Using Equation 2,
IMAX=
115 - 85
600 × 150
=
575
mA
To prevent thermal limiting, the operating load cur-
rent in the application must be less than 575mA.
4680.2001.11.0.91
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부품번호상세설명 및 기능제조사
AAT4680IGV-T1

Electronic Resettable Fuse

Advanced Analogic Technologies
Advanced Analogic Technologies

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