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AAT4670IKS-B1 PDF 데이터시트 ( Data , Function )

부품번호 AAT4670IKS-B1 기능
기능 Dual-Input/ Dual-Output Load Switches
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AAT4670IKS-B1 데이터시트, 핀배열, 회로
AAT4670
Dual-Input, Dual-Output Load Switches
General Description
The AAT4670 SmartSwitch™ is part of the Analogic
Tech Application Specific Power MOSFET
(ASPM™) line of products. The AAT4670 consists
of dual, independent, 1A current limited, slew rate
controlled P-channel MOSFET power switches with
a dedicated source and drain pin assigned to each
switch. The internal circuitry automatically derives
power from the higher of the two input power source
pins with a low operating quiescent current of 18µA.
In shutdown mode, the supply current decreases to
less than 1µA. The switches operate with inputs
ranging from 2.2V to 5.5V, making them ideal for
2.5V, 3V and 5V systems. The dual configuration
permits integration of the load switch function for
systems with two different power busses.
Independent under voltage lockout circuits will shut
down the corresponding switch if its input voltage
falls below the under voltage lockout threshold. If
the die temperature reaches the thermal limit, both
switches thermal cycle off and on indefinitely without
damage until the thermal condition is removed. An
open drain FAULT output signals an over current or
over temperature condition for each channel. Input
logic levels are TTL compatible.
The AAT4670 is available in 8 pin SOP, TSSOP or
MSOP specified over -40 to 85 °C temperature
range.
Features
SmartSwitch
• 2.2V to 5.5V input voltage range
• 1A current limit per channel
• 95mtypical RDS(ON)
• Fast transient response:
• < 1µs response to short circuit
• Low 18µA quiescent current
• 1µA max with Switches off
• Slew rate controlled
• Thermal shutdown
• Fault flags with 3ms blanking
• Under voltage lockout
• Temp range -40 to 85ºC
• 8-pin SOP, TSSOP or MSOP packages
Applications
• Notebook Computer
• PDA, Subnotebook
• USB ports
• Peripheral ports
• Hot swap supplies
• Media bay
Typical Application
INA
INB
CINA
1µF
GND
EN
CINB
1µF
7 INA
6 INB
1 EN
AAT4670
GND
OUTA
OUTB
FAULTA
FAULTB
8
5
2
3
4
FAULTA
FAULTB
COUTA
1µF
OUTA
OUTB
COUTB
1µF
GND
4670.2002.1.0.92
1




AAT4670IKS-B1 pdf, 반도체, 판매, 대치품
AAT4670
Dual-Input, Dual-Output Load Switches
Typical Characteristics
Quiescent Current vs. Temperature
30
25
20
15
10
5
0
-40
-20
0 20 40 60 80
Temperature (°C)
100 120
Quiescent Current vs. Input Voltage
20
18
16
14
12
10
8
6
4
2
0
0 1234 56
Input (V)
Off-Supply Current vs. Temperature
1.0000
0.1000
0.0100
0.0010
0.0001
0.0000
-40
-20
0 20 40 60 80
Temperature (°C)
100 120
Off-Switch Current vs. Temperature
1.0000
0.1000
0.0100
0.0010
0.0001
0.0000
-40
-20
0 20 40 60 80
Temperature (°C)
100 120
Current Limit vs. Output Voltage
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 12 3 4 5
Output (V)
RDS(ON) vs. Temperature
150
140
130
120 VIN=3V
110
100
90 VIN=5V
80
70
60
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
4 4670.2002.1.0.92

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AAT4670IKS-B1 전자부품, 판매, 대치품
AAT4670
Dual-Input, Dual-Output Load Switches
Applications Information
Input Capacitor
The input capacitors, CINA and CINB, protect the input
power supplies from current transients generated by
loads attached to the AAT4670. If a short circuit is
suddenly applied to an output of the AAT4670, there
is a 750 nanosecond period during which a large
current flows before current limit circuitry activates.
(See characteristic curve "Short Circuit Through
0.3.") In this event, a properly sized input capaci-
tor can dramatically reduce the voltage transient
seen by the power supply and other circuitry
upstream from the AAT4670. CIN should be located
as close to the device VIN pin as practically possible.
Ceramic, tantalum or aluminum electrolytic capaci-
tors may be selected for CIN. There is no specific
capacitor ESR requirement for CIN. However, for
higher current operation, ceramic capacitors are rec-
ommended for CIN due to their inherent capability
over tantalum capacitors to withstand input current
surges from low impedance sources such as batter-
ies in portable devices.
Output Capacitor
In order to insure stability while the current limit is
active, a small capacitance of approximately 1µF is
required on each output. No matter how big the
output capacitor, output current is limited to the
value set by the AAT4670 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 AAT4670 will charge
at a rate no greater than the current limit setting.
FAULT Output
FAULT flags are provided to alert the system if an
AAT4670 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, the associ-
ated FAULT flag is pulled to ground through
approximately 100. Removal of voltage or cur-
rent transients of less than three milliseconds pre-
vents capacitive loads connected to either
4670.2002.1.0.92
AAT4670 output from activating the associated
FAULT flag when they are initially attached. Pull up
resistances of 1kto 100kare recommended.
Since FAULT is an open drain terminal, it may be
pulled up to any unrelated voltage less than the
maximum operating voltage of 5.5V, allowing for
level shifting between circuits.
Thermal Considerations
Since the AAT4670 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 AAT4670 at high temper-
ature. RθJA is the thermal resistance between the
AAT4670 die and the board onto which it is mount-
ed. TA(MAX) is the maximum temperature that the
PCB under the AAT4670 would be if the AAT4670
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 AAT4670 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 120°C/W. Using Equation 2,
IMAX=
115
160m
- 85
× 120
=
1.25
A
To prevent thermal limiting, the operating load cur-
rent in the application must be less than 1.25A
which lies in the current limiting range, so in this
application, any operating current below the cur-
rent limit threshold is allowed.
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AAT4670IKS-B1

Dual-Input/ Dual-Output Load Switches

Advanced Analogic Technologies
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