201909A.pdf

DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
General Description
Features
The AAT4670 SmartSwitch is a member of Skyworks’
Application Specific Power MOSFET™ (ASPM™) product
family. 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.
•
•
•
•
•
•
•
•
•
•
•
•
2.2V to 5.5V Input Voltage Range
1A Current Limit Per Channel
95m Typical 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
Temperature Range: -40°C to +85ºC
SOP-8 Package
Applications
•
•
•
•
•
•
Hot Swap Supplies
Media Bay
Notebook Computer
PDA, Subnotebook
Peripheral Ports
USB Ports
The AAT4670 is available in a Pb-free, 8-pin SOP package and is specified over the -40°C to +85°C temperature range.
Typical Application
AAT4670
INA
INB
EN
INA
INB
EN
GND
CINA
1μF
GND
CINB
1μF
OUTA
OUTB
FAULTA
FAULTB
OUTA
OUTB
FAULTA
FAULTB
COUTA
1μF
COUTB
1μF
GND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201909A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012
1
DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
Pin Descriptions
Pin
Symbol
1
2
3
4
5
6
7
8
EN
FAULTA
FAULTB
GND
OUTB
INB
INA
OUTA
Function
Active-low enable input (logic low turns the switches on).
Open drain output; signals over-current for OUTA and over-temperature condition.
Open drain output; signals over-current for OUTB and over-temperature condition.
Ground connection.
P-channel MOSFET drain channel B.
P-channel MOSFET source channel B.
P-channel MOSFET source channel A.
P-channel MOSFET drain channel A.
Pin Configuration
SOP-8
(Top View)
OUTA
7
INA
3
6
INB
4
5
OUTB
FAULTA
2
FAULTB
GND
2
1
1
2
8
EN
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DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
Absolute Maximum Ratings1
Symbol
VINA,B
VOUTA,B
VFAULTA,B
IOUT
TJ
VESD
TLEAD
Description
INA or INB to GND
OUTA or OUTB to GND
FAULTA or FAULTB to GND
Output Current
Operating Junction Temperature Range
ESD Rating2 - HBM
Maximum Soldering Temperature (at Leads)
Value
Units
-0.3 to 6
-0.3 to 6
-0.3 to 6
Internally Limited
-40 to 150
4
300
A
°C
kV
°C
Value
Units
100
1.25
°C/W
W
V
Thermal Characteristics3
Symbol
JA
PD
Description
Maximum Thermal Resistance
Maximum Power Dissipation
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied.
2. Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
3. Mounted on a demo board.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201909A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012
3
DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
Electrical Characteristics
VIN = 5V, TA = 25°C, unless otherwise noted. Bold values designate -40°C to +85°C temperature range.
Symbol
VIN
IQ
IQ(OFF)
ISD(OFF)
VUVLO
RDS(ON)
Description
Conditions
Operation Voltage
Quiescent Current
Off Supply Current
Off Switch Current
Under-Voltage Lockout
VINA or VINB = 5V IOUTA = IOUTB = 0
EN = VIN, VINA = VINB = 5V, OUTA, OUTB Open
EN = VIN, VINA = VINB = 5V, VOUTA = VOUTB = 0V
On-Resistance Channel A or B
VIN = 5.0V
VIN = 3.0V
ILIM
t1
t2
t3
t4
VEN(L)
Switch Resistance Temperature
Coefficient
Current Limit Channel A or B
Output Turn-On Delay Time
Output Rise Time
Output Turn-Off Delay Time
Output Fall Time
EN Input Low Voltage
VEN(H)
EN Input High Voltage
TCRDS
IEN(SINK)
tRESP
VFAULTLOW
ISINK
Tblank
TSD
EN Input Leakage
Current Loop Response
FAULT Logic Output Low
FAULT Logic Output High Leakage
Current
FAULT Blanking Time
Over-Temperature Threshold
Min
Typ
2.2
18
0.1
1.7
95
105
Max
Units
5.5
40
1
1
2.2
130
150
V
2800
VOUT < VIN to 0.5V
VIN = 5V, OUT = 0 to 10%, RLOAD = 20
VIN = 5V, OUT = 10% to 90%, RLOAD = 20
VIN = 5V, OUT = 100% to 90%, RLOAD = 20
VIN = 5V, OUT = 90% to 10%, RLOAD = 20
VIN = 2.7V to 5.5V1
VIN = 2.7V to < 3.6V
VIN = 3.6V to 5.5V
VEN = 5.5V
VIN = 5V
ISINK = 1mA
VFAULT = 5.5V
1.0
1.25
100
100
10
5
V
m
ppm/°C
1.50
1000
1000
20
20
0.8
A
μs
V
2.0
2.4
0.01
750
0.5
1
0.4
μA
ns
V
1
μA
3
125
1. For VIN outside this range, consult typical EN threshold curve.
4
μA
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201909A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012
ms
°C
DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
Typical Characteristics
Quiescent Current vs. Temperature
Quiescent Current vs. Input Voltage
Quiescent Current (μA)
Quiescent Current (μA)
30
25
20
15
10
5
0
20
18
16
14
12
10
8
6
4
2
0
-40
-20
0
20
40
60
80
100
120
0
1
2
Off-Supply Current vs. Temperature
4
5
6
Off-Switch Current vs. Temperature
1.0000
Off-Switch Current (μA)
1.0000
Off-Supply Current (μA)
3
Input Voltage (V)
Temperature (°C)
0.1000
0.0100
0.0010
0.0001
0.0000
0.1000
0.0100
0.0010
0.0001
0.0000
-40
-20
0
20
40
60
80
100
120
-40
-20
0
Temperature (°C)
20
40
60
80
100
120
Temperature (°C)
Current Limit vs. Output Voltage
RDS(ON) vs. Temperature
1.4
140
1.0
RDS(ON) (mΩ)
Output Current (A)
150
1.2
0.8
0.6
0.4
130
120
VIN = 3V
110
100
90
VIN = 5V
80
0.2
70
0.0
60
0
1
2
3
Output Voltage (V)
4
5
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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5
DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
Typical Characteristics
FAULT Delay
Start Into 0.6Ω Load
Turn-On/Off Response with 20Ω 1μF Loads
EN (5V/div)
FAULT (5V/div)
ON (5V/div)
OUTB (5V/div) INB = 5V
FAULT (5V/div)
OUTA (5V/div) INA = 3V
VOUT (1V/div)
IINA + IINB (200mA/div)
IIN (500mA/div)
Time (100μs/div)
Time (500μs/div)
Short Circuit Through 0.3Ω
9
4
6
3
Output Current
2
0
Output Voltage
0
-3
-1
0
1
2
3
4
8
12
Input Voltage
6
8
4
4
Output Current
2
0
0
Output Voltage
-2
Output Current (A)
Input Voltage
6
Input and Output Voltage (V)
8
Output Current (A)
Input and Output Voltage (V)
Short Circuit Through 0.6Ω
-4
-1
0
1
Time (μs)
2
3
4
Time (μs)
Typical EN Threshold vs. Input Voltage
Thermal Shutdown Response
ON (5V/div)
FAULT (5V/div)
VOUT (1V/div)
IIN (500mA/div)
EN Threshold (V)
2.4
2.2
2
1.8
VEN(H)
1.6
1.4
1.2
VEN(L)
1
0.8
0.6
1.5
Time (200ms/div)
6
2
2.5
3
3.5
4
4.5
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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5.5
DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
Functional Block Diagram
INA
OUTA
ILIM
Slew
Rate
UVLO
EN
OTMP
UVLO
ILIM
Slew
Rate
INB
OUTB
FAULTA
FAULTB
GND
Functional Description
The AAT4670 dual channel load switch, implemented
with isolated independent P-channel MOSFET devices, is
ideal for applications where dual power supplies are in
continuous use. Typical applications for this include
products with multiple USB ports, or ports requiring protection that operate from separate power supplies. The
input power supplies can be any voltage between 2.2V
and 5.5V in any combination; one supply is not required
to be the higher voltage. Internally, the power supply for
the control circuitry will automatically switch to the
higher of the two supplies. In the case where the supplies are equal, ±30mV of hysteresis prevents the internal supply from oscillating between the two input supplies. The low impedance P-channel MOSFET devices are
identical in size, allowing for layout flexibility. They are
controlled by a patented fast acting current loop and
respond to short circuits in a fraction of a microsecond,
easing requirements on the input capacitors. With such
fast transient response time, the upstream power supply
rail is naturally isolated from the protected port.
ambient temperature or an over-current condition causes
the die temperature to reach 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 or high temperature condition is removed.
Due to the high thermal conductivity of silicon and the
size of the die, the temperature 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. Since the power devices operate from independent power supplies, independent under-voltage lockout circuits are employed. If the
power supply to one channel falls below the under-voltage lockout threshold, the other channel will remain
active. A current limit condition is reported by the open
drain FAULT output associated with the appropriate
channel. A thermal limit condition is reported by both
FAULT outputs. A three millisecond blanking interval prevents false reporting during the charging of a capacitive
load, which typically occurs during device turn-on, but
may also occur during a port hot plug-in event.
The AAT4670 is internally protected from thermal damage by an over-temperature detection circuit. If a high
The AAT4670 is ideally suited for protection of peripheral ports such as USB, PS2, and parallel ports.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201909A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012
7
DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
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 capacitor 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 capacitors may be selected for CIN. There is no specific capacitor equivalent series resistance (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 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 downstream 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-temperature circuits
in any combination are active for more than approximately three milliseconds, the associated FAULT flag is
pulled to ground through approximately 100. Removal
of voltage or current transients of less than three milliseconds prevents capacitive loads connected to either
8
AAT4670 output from activating the associated FAULT
flag when they are initially attached. Pull-up resistances
of 1k to 100k are 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 overtemperature 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 applications, 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.
2
Eq. 1: T
J(MAX) = IMAX • RDS(ON)(MAX) • RΘJA + TA(MAX)
In Equation 1, IMAX is the maximum current required by
the load. RDS(ON)(MAX) is the maximum rated RDS(ON) of the
AAT4670 at high temperature. RJA is the thermal resistance between the AAT4670 die and the board onto
which it is mounted. 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.
Eq. 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 operate in
50°C environments, the PCB operates at temperatures
as high as 85°C. The application is sealed and its PCB is
small, causing RJA to be approximately 120°C/W. Using
Equation 2:
115°C - 85°C
Eq. 3: IMAX = 130mΩ · 120°C/W = 1.39A
To prevent thermal limiting, the operating load current in
the application must be less than 1.39A which lies in the
current limiting range. So, in this application, any operating current below the current limit threshold is allowed.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201909A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012
DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
Timing Diagram
EN
OUT
t1
t2
t3
t4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201909A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012
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DATA SHEET
AAT4670
Dual-Input, Dual-Output Load Switch
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
SOP-8
4670
AAT4670IAS-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Package Information
6.00 ± 0.20
3.90 ± 0.10
SOP-8
4.90 ± 0.10
0.42 ± 0.09 × 8
1.27 BSC
45°
4° ± 4°
0.175 ± 0.075
1.55 ± 0.20
0.375 ± 0.125
0.235 ± 0.045
0.825 ± 0.445
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
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responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
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Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
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10
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201909A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 26, 2012