201943A.pdf

DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
General Description
Features
The AAT4620 SmartSwitch is a current limited P-channel
MOSFET power switch designed for high-side loadswitching applications in PCMCIA GSM/GPRS/3G modem
cards. Used in conjunction with a super capacitor, the
AAT4620 will ensure that the power ratings of the PCMCIA
host are not exceeded at any time. Featuring two independent, programmable current limits and a power loop,
the AAT4620 can ensure that the super capacitor can be
charged without exceeding PCMCIA specifications. The
current limit is set by two external resistors allowing a
±10% current limit accuracy over the normal operating
temperature range. The switch can be controlled from
either of the two enable inputs and in the off condition
will block currents in both directions. The AAT4620 also
incorporates a System READY function which can advise
the system that the super capacitor is fully charged and
ready for use. Adjustable hysteresis is provided with the
addition of an external resistor. The quiescent supply current is typically a low 40μA. In shutdown mode, the supply current decreases to less than 1μA.
• VIN Range: 3.0V to 5.5V
• Dual Independent Current Limits
▪ 100mA to 1200mA
▪ ±10% Current Accuracy
▪ 20°C Temperature Band
• Reverse Current Blocking Protection
• Power Loop
• Low Quiescent Current
▪ 40μA Typical
▪ 1.0μA Max with Switch Off
• 65m Typical RDS(ON) at 3V
• Only 1.4V Needed for Enable Control Pin
• System READY Output with Externally Programmable
Hysteresis
• Under-Voltage Lockout
• Temperature Range: -40°C to 85°C
• 12-Pin TSOPJW Package
The AAT4620 is available in a thermally enhanced,
Pb-free, 12-pin TSOPJW package and is specified over
the -40°C to 85°C temperature range.
Applications
•
•
•
•
•
CF Card Port Power Protection
Express Card GSM/GPRS/3G Modems
Hot Swap Supplies
PCMCIA Card GSM/GPRS/3G Modems
Personal Communication Devices
Typical Application
100kΩ
Reverse
Blocking
VCC
OUT
To Load
RDY
To μC
VCC
Over-Temp
Protection
Power
Loop
UnderVoltage
Lockout
EN IL
ENSUPERCAP
ENOPERATION
EN IU
1.2V
Reference
Current
Limit
Control
ISETL
ISETU
GND
SuperCap
R HYS
R SETU
R SETL
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1
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Pin Descriptions
Pin #
Symbol
1
EN IU
2
EN IL
3
4, 5, 6
7, 8
GND
VCC
OUT
9
ISETL
10
ISETU
11
12
RHYS
RDY
Function
Enable input. Active low enable with internal pull up. Also switches in the higher current limit to allow the
System to start functioning. Can be directly connected to System Ready for automatic enabling. When
both EN IL and EN IU are enabled, ISETU will be selected.
Enable input. Active low enable with internal pull up. Also switches in the lower current limit initiating the
super capacitor to start charging.
Device ground connection.
Input pins to the P-channel MOSFET source. Connect 1μF capacitor from VCC to GND.
P-channel MOSFET drain connection. Connect to super capacitor from OUT to GND.
Lower current-limit set input. A resistor from ISETL to ground sets the maximum lower current limit for
the switch. Current limit can be set between 100mA and 1200mA.
Upper current limit set input. A resistor from ISETU to ground sets the maximum upper current limit for
the switch. Current limits can be set between 100mA and 1200mA. Connect to ground to disable current
limit.
System READY hysteresis. Connect a resistor to ground to set the System Ready comparator hysteresis.
System ready pin. Open drain, active low, initiated when the capacitor is 98% charged.
Pin Configuration
TSOPJW-12
(Top View)
EN IU
EN IL
GND
VCC
VCC
VCC
2
1
12
2
11
3
10
4
9
5
8
6
7
RDY
RHYS
ISETU
ISETL
OUT
OUT
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Absolute Maximum Ratings1
Symbol
Description
VCC
VEN
VSET, VOUT
IMAX
VCC to GND
EN to GND
SET, OUT to GND
Maximum Continuous Switch Current
Value
Units
-0.3 to 6
-0.3 to VCC + 0.3
-0.3 to VCC + 0.3
2.5
V
V
V
A
Value
Units
160
625
-40 to 150
°C/W
mW
°C
Thermal Characteristics
Symbol
JA
PD
TJ
Description
Maximum Thermal Resistance
Maximum Power Dissipation2
Operating Junction Temperature Range
2
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. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board.
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Electrical Characteristics1
VCC = 3.0V to 5.5V, TA = -40°C to 85°C unless otherwise noted. Typical values are at TA = 25°C.
Symbol
Description
VCC
IQ
Operation Voltage
Quiescent Current
IQU0
Quiescent Current U0
Conditions
Typ
Max
Units
40
5.5
75
V
μA
1.0
10
3.0
100
120
220
230
1100
1150
μA
μA
V
3.0
EN IL or EN IU = VCC, IOUT = 0, RHYS = 200k
EN IL = VCC, EN IU = GND, IOUT = 0, ISET = GND,
RHYS = 200k
EN IL = EN IU = VCC
EN IL = EN IU = VCC, VSUPERCAP = 0
Rising edge, 1% hysteresis
VCC =4.75V, RSETL = RSETU = 0k
VCC =3.0V, RSETL = RSETU = 0k
RSETL = 249k; TA ≤ 20°C
RSETL = 249k
RSETU = 1.24M; TA ≤ 20°C
RSETU = 1.24M
IQ(OFF)
ISD(OFF)
VUVLO
Off Supply Current
Off Switch Current
Under-Voltage Lockout
RDS(ON)
On-Resistance
ILIMLACC
Lower Current Limit Accuracy
ILIMUACC
Upper Current Limit Accuracy
ILIM(MIN)
VEN(L)
VEN(H)
IEN(SINK)
TDEL(OFF)
Lower Minimum Current Limit
EN Input Low Voltage
EN Input High Voltage
EN Input Leakage
Turn-Off Delay Time
VCC
VCC
VEN
VCC
VRDY
System READY Trip Threshold
VOUT rising, TA = 25°C
System READY Hysteresis
System READY Voltage Low
RDY Leakage Current
Shutdown Temperature
RHYS = 200k
ISINK = 1mA
VRDY < 5.5V, VOUT < 98% of VOUT
VRDYHYS
VRDY(L)
IRDY
OTMP
Min
=3.0V to 5.5V2
= 3.0V to 5.5V2
= 5.5V
= 5V
180
170
900
850
0.4
0.4
2.7
50
65
200
200
1000
1000
75
0.4
1.4
0.4
1.0
1.0
98
200
0.4
1.0
145
m
mA
mA
mA
V
V
μA
μs
% of
VOUT
mV
V
μA
°C
1. The AAT4620 is guaranteed to meet performance specification over the -40°C to 85°C operating temperature range and is assured by design, characterization and correlation
with statistical process controls.
2. For VIN outside this range consult the Typical EN Threshold curve.
4
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Typical Characteristics
Output Current vs. Output Voltage
RSET vs. ILIM
(RSETU = 383kΩ
Ω, 25°C)
(25°°C)
1.40
VIN = 3.3V
1.20
0.30
1.00
ILIM (A)
Output Current (A)
0.40
0.20
VIN = 5V
0.10
VIN = 3.3V
0.80
0.60
VIN = 5V
0.40
0.20
0.00
0.00
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3
3.3
0
200
400
600
Output Voltage (V)
1200
1400
1600
Off-Switch Current vs. Temperature
(ENUB = ENLB = VCC; VIN = 0V)
(ENUB = ENLB = VCC; VOUT = 0V)
100
100
10
10
VOUT = 5V
ISD(OFF) (µA)
IRSD(OFF) (µA)
1000
RSET (kΩ)
Reverse Off-Switch Current vs. Temperature
1
0.1
0.01
-40
800
VOUT = 3.3V
-20
0
20
40
60
80
100
120
Temperature (°°C)
VIN = 5V
1
0.1
VIN = 3.3V
0.01
-40
-20
0
20
40
60
80
100
120
Temperature (°°C)
Off-Supply Current vs. Temperature
(ENUB = ENLB = VCC; VOUT = Open)
10
IQ(OFF) (µA)
VIN = 5V
1
0.1
0.01
-40
VIN = 3.3V
-20
0
20
40
60
80
100
120
Temperature (°°C)
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Typical Characteristics
RDS(ON) vs. Input Voltage
RDS(ON) vs. Temperature
(RSET = 0kΩ
Ω)
(RSET = 0Ω
Ω)
90
70
80
RDS(ON) (mΩ)
RDS(ON) (mΩ)
65
60
55
50
VIN = 3V
70
60
50
VIN = 5V
40
45
2.5
3
3.5
4
4.5
5
30
-40
5.5
-20
0
Input Voltage (V)
20
40
60
80
100
Temperature (°C)
VRHYS vs. RRHYS
ILIM vs. Temperature
(VIN = 4V; VOUT = 3.85V; ENLB = 0V; RSET = 249kΩ
Ω)
2.00
210
1.80
205
1.40
ILIM (mA)
VRHYS (V)
1.60
1.20
1.00
0.80
0.60
200
195
0.40
0.20
0.00
0
500
1000
190
-50
1500
-25
0
50
75
100
Temperature (°C)
RRHYS (kΩ
Ω)
ILIM vs. Temperature
Quiescent Current IQL vs. Temperature
(VIN = 4V; VOUT = 3.85V; ENUB = 0V; RSET = 1.24MΩ
Ω)
(ENLB = 0V; ENUB = VCC; VOUT = Open)
50
1020
VIN = 5V
45
1000
IQL (µA)
ILIM (mA)
25
40
35
VIN = 3.3V
30
980
25
960
-50
-25
0
25
50
Temperature (°C)
6
75
100
20
-40
-20
0
20
40
60
80
Temperature (°°C)
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100
120
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Typical Characteristics
VIH vs. Input Voltage
VIL vs. Input Voltage
(ENUB = Open; Vary ENLB; 25°C)
1.1
1.1
1.0
1.0
0.9
0.9
VIH (V)
VIL (V)
(ENUB = Open; Vary ENLB; 25°C)
0.8
0.7
0.7
0.6
2.5
0.8
3.5
4.5
5.5
6.5
0.6
2.50
7.5
3.50
Input Voltage (V)
VIL vs. Input Voltage
6.50
7.50
(ENLB = Open; Vary ENUB; 25°C)
1.1
1.1
1.0
1.0
0.9
0.9
VIH (V)
VIL (V)
5.50
VIH vs. Input Voltage
(ENLB = Open; Vary ENUB; 25°C)
0.8
0.8
0.7
0.7
0.6
2.5
3.5
4.5
5.5
6.5
7.5
0.6
2.50
Input Voltage (V)
0.2
0.0
Input Voltage (top) (V)
Output Voltage (middle) (V)
0.4
Time (200ms/div)
6.50
7.50
6
4
2
0
0.4
0.2
0.0
Output Current (A)
0.6
Output Current (A)
0.8
0
5.50
(VIN = 5V)
1.0
2
4.50
Soft Short Circuit with 5Ω
Ω Series Impedance
(VIN = 3.3V)
4
3.50
Input Voltage (V)
Short Circuit with 5Ω
Ω Series Impedance
Input Voltage (middle) (V)
Output Voltage (bottom) (V)
4.50
Input Voltage (V)
-0.2
Time (200ms/div)
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Typical Characteristics
Hard Short Circuit
Hard Short Circuit
4
2
0
0.4
0.2
0.0
-0.2
Time (200ms/div)
4
2
0
0.4
0.2
0.0
-0.2
Time (200ms/div)
Charging Profile
Charging Profile
(ILIMIT = 150mA; VIN = 5V; CO = 0.55F)
2
0
0.30
0.15
0.00
2
0
0.15
0.10
0.05
0.00
-0.15
Output Current (A)
4
Output Current (A)
6
Output Voltage (V)
(ILIMIT = 150mA; VIN = 5V; CO = 0.55F)
Output Voltage (V)
6
Output Current (A)
6
Input Voltage (top) (V)
Output Voltage (middle) (V)
(VIN = 5V)
Output Current (A)
Input Voltage (top) (V)
Output Voltage (middle) (V)
(VIN = 3.3V)
-0.05
Time (5s/div)
Time (20ms/div)
Charging Profile
Charging Profile
(ILIMIT = 1A; VIN = 5V; CO = 0.55F)
(VIN = 5V, VISETL = VISETU = 0V, CO = 0.55F)
1.0
0
0.8
0.6
0.4
0.2
0.0
Output Voltage (V)
2
6
4
2
0
1.5
1.0
0.5
0.0
-0.2
Time (2s/div)
8
-0.5
Time (2s/div)
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Output Current (A)
4
Output Current (A)
Output Voltage (V)
6
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Functional Block Diagram
Reverse
Blocking
OUT
VCC
Over-Temp
Protection
Power
Loop
UnderVoltage
Lockout
RDY
EN IL
EN IU
1.2V
Reference
Current Limit
Control
GND
Functional Description
The AAT4620 is an integrated P-channel MOSFET load
switch with an upper and lower adjustable current limits
which can be enabled independently, over-temperature
protection, a power loop and a super capacitor charger.
The current limit control is combined with an over temperature thermal limit and power loop circuit to provide
a comprehensive system to protect the load switch and
its supply from load conditions which exceed the supply
specifications. The AAT4620 has been designed specifically to provide the interface between a PCMCIA host
and PCMCIA card where a super capacitor has been used
ISETL
ISETU
RHYS
to “average out” high pulse currents which would otherwise exceed the PCMCIA/ Express Card power specifications. e.g. GSM/ GPRS modem cards, where pulse currents during transmit signals can exceed the 1A maximum specification (1.3A in the case of Express Card).
The current limit and over temperature circuits act independently. The device current limit is activated when the
output load current exceeds an internal threshold level.
There are two internal current limits which are enabled
independently. The current limit threshold in each case
is determined by external resistors connected between
the two SET pins and ground. The minimum current limit
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
threshold is specified by ILIM(MIN). If the load condition
maintains the device in current limit and the chip temperature reaches a critical point, then an internal power
loop will reduce the current to a safe level. Connecting
ISETU to ground disables the current limit protection
allowing a low impedance path to the host VCC.
The load switch is turned off by applying a logic high
level to both of the EN pins. When both EN IL and EN IU
are selected ISETU will be selected. The EN function has
logic level thresholds that allow the AAT4620 to be TTL
compatible and may also be controlled by 2.5V to 5.0V
CMOS circuits. The voltage level applied to the EN pins
should not exceed the input supply level present on the
VCC pin. The AAT4620 typically consumes 40μA when
operating, when off, the device draws less then 1μA. In
the off state, current is prevented from flowing between
the input and output.
Under-voltage lockout circuitry ensures that the VCC supply is high enough for correct operation of the IC. Also
included is a System Ready function which will be activated when the capacitor voltage is charged and the load
is permitted to take current. For automatic functionality,
this pin can be directly connected to the EN IU pin. An
external resistor is provided to add hysteresis to this
function.
Application Information
ISETU and ISETL Current Limit Set
The AAT4620 current limit is set at two different levels.
Resistors from ISETL and ISETU set the lower and upper
current limit levels respectively.
The ISETL and ISETU nodes operate within a window of
0.75V to 1.5V for resistor values ranging from 93.75 to
1.5M. Resistor values outside this range are not recommended. The ISETL and ISETU source current varies with
the resistor value used according to Table 1. To determine
the resulting current limit multiply the RSETU or RSETL node
voltage times the gain in Table 1. Note that the voltage at
the node varies from 0.75V to 1.5V and the current limit
gain varies depending on the resistor value used.
VISET = RSET · IISET = 0.75V to 1.5V
If the set pin is open circuit or allowed to exceed 2V, all
power devices are disabled and the input is disconnected
from the output. Shorting the set pin to GND enables all
power devices and shorts the VCC to the output pin with
no current limit.
To activate the upper current level (RSETU) pull EN IU low.
To activate the lower current level (RSETL) pull EN IL low.
If both EN IU and EN IL are pulled low the EN IU current
limit level (RSETU) will be selected.
RSET Range
IISET (μA)
ILIM/VISET (A/V)
Current Limit Range (A)
Current Limit
1.5Meg - 750k
750k - 375k
375k - 187.5k
187.5 - 93.75k
1
2
4
8
0.8
0.4
0.2
0.1
1.2-0.6
0.6-0.3
0.3-0.15
0.15-0.075
RSET*1μA*0.8
RSET*2μA*0.4
RSET*4μA*0.2
RSET*8μA*0.1
Table 1: RSET Table.
10
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
exceeds 100°C it decreases the load current by 1/32 of
the current limit set point. If die temperature is less than
100°C, it increases the load current in increments of 1/32
of the current limit set point until the set current limit
point is reached or the die temperature exceeds 100°C.
1.2
ILOAD Limit (A)
1.0
0.8
0.6
0.4
0.2
0.0
0.10
0.30
0.50
0.70
0.90
1.10
1.30
1.50
RSETU and RSETL (MΩ
Ω)
Figure 1: Calculated Current Limit RSET
Characteristic.
System Ready Hysteresis
(RHYS) and System Ready (RDY)
In internal comparator senses the output voltage and
delivers a ready signal to the external micro controller
when the output voltage reaches 98% of the final value
(VCC). The comparator hysteresis is programmed by a
resistor from the RHYS pin to ground. The RHYS voltage
determines the hysteresis voltage and is equal to the
RHYS source current (1μA) times the RHYS resistance.
VHYST = RHYS · 1μA
= 200kΩ · 1μA
= 0.2V
The system ready pin (RDY) is an open drain output that
switches low when the output voltage reaches 98% of
the input voltage. It requires an external pull up resistor
tied to the input voltage with a typical value of 100k.
Power Loop
The AAT4620 power loop limits the load current in the
event that the device power dissipation becomes excessive. The AAT4620 power loop regulates the die temperature to 100°C, decreasing the load current in increments
of 1/32 of the current limit set point when the die temperature reaches 100°C. When the die temperature
The delay time between die temperature measurements
varies depending on the load current limit set point. The
delay ranges from 1ms for a 75mA current limit set point
to 8ms for a 1.5A current limit set point.
For the condition where there is no current limit set point
(shorting RSETU or RSETL to ground) the soft start increments the current limit is 1/32 steps of 1.2A until the
current reaches 1.2A, at which point the power MOSFET
turns on fully. At this point, the current is limited by the
RDS(ON) of the power MOSFET and other series resistance.
The Power Loop and Over-Temperature Loop then takes
control to limit the current until the output voltage has
fully charged.
Over-Temperature Protection
If the die temperature rate of rise is fast enough to
exceed the power loop regulated temperature, overtemperature shutdown disables the device. The overtemperature threshold is 145°C. After over-temperature
shutdown, soft start is initiated once the die temperature
drops to 130°C.
Short Circuit Protection
The series pass power MOSFET turns off completely after
the output has charged to within 18mV of the input voltage. This protects the device in the event of a short
circuit applied to the output. Applying a short circuit or
heavy load to the output initiates the digital soft start
where the current ramps from zero to the final programmed value. The power loop will be activated once
the digital soft start begins.
Under-Voltage Shutdown
Under-voltage lockout enables the device at 2.7V typical
with 100mV of hysteresis. The maximum UVLO level is
3.0V.
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DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Digitally Programmed
Soft Start Current Limit
Reverse Current Blocking
An internal comparator disables the internal pass transistor when the input voltage is less than the output
voltage blocking any reverse current from the output to
the input.
At turn on, the digital soft start increases the load current in discrete levels equal to 1/32 of the final programmed current limit set point from zero to the final
programmed current limit level.
Evaluation Board
The evaluation board schematic is shown in Figure 2.
The PCB layout is shown in Figures 3 and 4.
J2
3
R1
4.7K
2
1
D1
ENIU
J1
1
ENIU
RDY
12
RDY
3
2
2
ENIL
RHYS
11
3
GND
ISETU
10
4
VCC
ISETL
9
5
VCC
OUT
8
6
VCC
OUT
7
1
ENIL
VCC
R3
1.00M
R2
200K
2
GND
1
J4
AAT4620
C1
10μF
C2
10μF
R4
120K
1
Out
2
GND
J3
Figure 2: AAT4620 Evaluation Board Schematic.
12
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Figure 3: AAT4620 Evaluation Board PCB Top Side.
Figure 4: AAT4620 Evaluation Board PCB Bottom Side.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012
13
DATA SHEET
AAT4620
PCMCIA Current Limit Interface and Capacitor Charger
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TSOPJW-12
UZXYY
AAT4620ITP-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
TSOPJW-12
2.85 ± 0.20
2.40 ± 0.10
0.20 + 0.10
- 0.05
0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC
7° NOM
0.04 REF
0.055 ± 0.045
0.15 ± 0.05
+ 0.10
1.00 - 0.065
0.9625 ± 0.0375
3.00 ± 0.10
4° ± 4°
0.45 ± 0.15
0.010
2.75 ± 0.25
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.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
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Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
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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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14
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201943A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 15, 2012