AAT4252A - Skyworks Solutions, Inc.

DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
General Description
Features
The AAT4252A SmartSwitch™ is a dual P-channel MOSFET
power switch designed for high-side load-switching applications. Each MOSFET has a typical RDS(ON) of 105mW,
allowing increased load switch current handling capacity
with a low forward voltage drop. The device is available
in three different versions with flexible turn-on and turnoff characteristics–from very fast to slew-rate limited.
The standard 4252A (-1) version has a slew-rate limited
turn-on load switch. The AAT4252A (-2) version features
a fast turn-on capabilities, typically less than 500ns turnon and 3µs turn-off times. The AAT4252A (-3) variation
offers a shutdown load discharge circuit to rapidly turnoff a load circuit when the switch is disabled. An additional feature is a slew-rate selector pin which can switch
between fast and slow slew rate.
•VIN Range: 1.5V to 6.5V
• Low RDS(ON)
▪87mW Typical @ 5V
▪196mW Typical @ 1.5V
• Slew Rate Turn-On Time Options
▪1ms
▪0.5µs
▪100µs
• Fast Shutdown Load Discharge Option
• Low Quiescent Current
▪Typically 500nA
• TTL/CMOS Input Logic Level
• Temperature Range: -40°C to +85°C
• Available in TSOPJW-12 Package
All the AAT4252A load switch versions are designed to
operate from 1.5V up to 6.5V, making then ideal for both
3V and 5V systems. Input logic levels are TTL and 2.5V
to 5V CMOS compatible. The quiescent supply current is
a very low 500nA.
Applications
• Cellular Telephones
• Digital Still Cameras
• Notebook Computers
• PDA Phones
•PDAs
•PMPs
•Smartphones
The AAT4252A is available in the Pb-free TSOPJW-12
package and is specified over the -40°C to +85°C temperature range.
Typical Application
INA
2
INA
OUTA
12
OUTA
INB
5
INB
OUTB
7
OUTB
ON/OFF
3
ENA
ON/OFF
4
ENB
1
FAST
C1
1µF
C2
1µF
FAST/SLOW
AAT4252A
GND
C3
0.1µF
N/C
C4
0.1µF
6
8,9,10,11
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1
DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Pin Descriptions
Pin #
Symbol
1
FAST
2
INA
3
ENA
4
ENB
5
INB
6
7
8, 9, 10, 11
12
N/C
OUTB
GND
OUTA
Function
Active-high input switches between FAST (Logic H) and SLOW (Logic L) slew rate.
This is the pin to the P-channel MOSFET source for Switch A. Bypass to ground through a 1µF capacitor. INA is independent of INB.
Active-High Enable Input A. A logic low turns the switch off and the device consumes less than 1µA of
current. Logic high resumes normal operation.
Active-High Enable Input B. A logic low turns the switch off and the device consumes less than 1µA of
current. Logic high resumes normal operation.
This is the pin to the P-channel MOSFET source for Switch B. Bypass to ground through a 1µF capacitor. INB is independent of INA.
Not connected.
This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1µF capacitor.
Ground connection.
This is the pin to the P-channel MOSFET drain connection. Bypass to ground through a 0.1µF capacitor.
Pin Configuration
TSOPJW-12
(Top View)
FAST
INA
ENA
ENB
INB
N/C
2
1
12
2
11
3
10
4
9
5
8
6
7
OUTA
GND
GND
GND
GND
OUTB
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DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Selector Guide
Slew Rate (Typ)
Part Number
AAT4252A-11
AAT4252A-21
AAT4252A-3
FAST (H)
SLOW (L)
Active Pull-Down
Enable
NO
NO
YES
Active High
Active High
Active High
1ms
0.5µs
100µs
1ms
Absolute Maximum Ratings2
Symbol
Description
VIN
VEN, FAST
VOUT
IMAX
IN to GND
EN, FAST to GND
OUT to GND
Maximum Continuous Switch Current
IDM
Maximum Pulsed Current
TJ
TLEAD
VESD
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads)
ESD Rating3 - HBM
IN ≥ 2.5V
IN ≤ 2.5V
Value
Units
-0.3 to 7
-0.3 to 7
-0.3 to VIN + 0.3
1.8
5.5
2.0
-40 to 150
300
4000
V
V
V
A
A
°C
°C
V
Value
Units
160
625
°C/W
mW
Thermal Characteristics4
Symbol
qJA
PD
Description
Thermal Resistance
Maximum Power Dissipation
1. Contact Sales for product availability
2. 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.
3. Human body model is a 100pF capacitor discharged through a 1.5kW resistor into each pin.
4. Mounted on an AAT4252A demo board in still 25°C air.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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3
DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Electrical Characteristics1
VIN = 5V, TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = 25°C per channel.
Symbol
Description
AAT4252A All Versions
VIN
Operation Voltage
IQ
Quiescent Current
IQ(OFF)
Off Supply Current
ISD(OFF)
Off Switch Current2
RDS(ON)
TCRRDS
On-Resistance
On Resistance Temperature
Coefficient
ON/OFF Input Logic Low Voltage
ON/OFF Input Logic High Voltage
ON/OFF Input Leakage
VIL
VIH
ISINK
AAT4252A-12
TD(ON)
Output Turn-On Delay Time
TON
Turn-On Rise Time
TD(OFF)
Output Turn-OFF Delay Time
AAT4252A-22
TD(ON)
Output Turn-On Delay Time
TON
Turn-On Rise Time
TD(OFF)
Output Turn-OFF Delay Time
AAT4252A-3
TD(ON)
Output Turn-On Delay Time
TON
Turn-On Rise Time
TON
Turn-On Rise Time
TD(OFF)
Output Turn-OFF Delay Time
Output Pull-Down Resistance
RPD
During OFF
Conditions
Min
Typ
1.5
ON/OFF = ACTIVE, FAST = VIN, IOUT = 0
ON/OFF = Inactive, OUT = Open
ON/OFF = GND, VOUT = 0
VIN = 5V
VIN = 4.2V
VIN = 3.0V
VIN = 1.8V
VIN = 1.5V
87
92
103
145
196
Max
Units
6.5
1.0
1.0
1.0
155
V
µA
µA
µA
mW
2800
VIN = 1.5V to 5.5V
VIN = 1.5V to 5.5V
VON/OFF = 5.5V
ppm/°C
0.4
1.0
V
V
µA
1.4
VIN = 5V, RLOAD =10W, TA = 25°C
VIN = 5V, RLOAD =10W, TA = 25°C
VIN = 5V, RLOAD =10W, TA = 25°C
10
600
2.0
40
1500
10
µs
µs
µs
VIN = 5V, RLOAD =10W, TA = 25°C
VIN = 5V, RLOAD =10W, TA = 25°C
VIN = 5V, RLOAD =10W, TA = 25°C
0.5
0.5
4.0
2
1.0
10
µs
µs
µs
VIN
VIN
VIN
VIN
10
65
600
2.0
40
150
1500
10
µs
µs
µs
µs
10
50
W
=
=
=
=
5V,
5V,
5V,
5V,
RLOAD
RLOAD
RLOAD
RLOAD
=10W,
=10W,
=10W,
=10W,
TA = 25°C
FAST = 5V, TA = 25°C
FAST = 0V, TA = 25°C
TA = 25°C
ON/OFF = Inactive, TA = 25°C
1.The AAT4252A is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls.
2. Contact Sales for product availability.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Typical Characteristics
VIN = 5V, TA = 25°C unless otherwise noted.
Quiescent Current vs. Input Voltage
Quiescent Current vs. Temperature
(No Load; Single Switch)
(No Load; Single Switch)
5
Quiescent Current (µA)
Quiescent Current (µA)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
4.5
4
3.5
3
2.5
VIN = 5V
2
1.5
VIN = 3V
1
0.5
0
0
0
1
2
3
4
5
6
-40
-15
Input Voltage (V)
10
35
60
85
Temperature (°C)
Off Supply Current vs. Temperature
Typical ON/OFF Threshold vs. Input Voltage
(No Load; EN = GND; VIN = 5V)
1.3
8
ON/OFF Threshold (V)
Off Supply Current (µA)
9
7
6
5
4
3
2
1
0
-40
-15
10
35
60
1.2
VIH
1.1
0.9
0.8
0.7
0.6
1.5
85
VIL
1
2
2.5
Temperature (°C)
4.5
5
5.5
VIN = 3.6V
VIN = 2.7V
250
230
120
On-Resistance (mΩ)
On-Resistance (mΩ)
4
On-Resistance vs. InputVINVoltage
= 4.2V
VIN = 3.6V
140
VIN = 3V
100
80
VIN = 5V
60
40
20
0
-40
3.5
Input Voltage (V)
On-Resistance vs. Temperature
VIN = 4.2V
VIN = 2.7V
3
-15
10
35
60
85
210
190
170
ISW = 2A
150
130
110
90
ISW = 100mA
70
50
1.5
2
2.5
Temperature (°C)
3
3.5
4
4.5
5.5
Input Voltage (V)
Skyworks Solutions, Inc. • Phone
4.2V 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
VIN = [781]
VIN = 4.2V
VIN =202228A
2.7V
5
3.6V
VIN• =July
• V
Skyworks
Proprietary Information • Products and Product Information are Subject to Change Without Notice.
31, 2012
IN = 3.6V
V = 2.7V
IN
5
DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Typical Characteristics
Output Turn-On
Output Turn-On
(VINA/VENA = 5V; VINB/VENB = 3V; RLA = 10Ω; RLB = 20Ω)
(VINA/VINB/VEN = 5V; RL = 10Ω)
6
Enable Voltage (top) (V)
Output Voltage (bottom) (V)
Enable Voltage (top) (V)
Output Voltage (bottom) (V)
VIN = 5V, TA = 25°C unless otherwise noted.
4
2
0
Switch A
4
2
Switch B
0
Time (500µs/div)
6
4
2
Switch A
0
4
2
Switch B
0
Time (500µs/div)
Output Turn-OnVIN = 4.2V
Output Turn-On
0.7
5
0.6
0.5
4
0.4
3
0.3
2
0.2
1
0.1
0
0
Time (500µs/div)
0.2
2
0.15
1.5
0.1
1
0.5
0.05
0
0
Time (500µs/div)
Output Turn-Off
(RL = 10Ω)
(VIN = 5V; RL = 10Ω)
7
Enable Voltage (top) (V)
Output Voltage (middle) (V)
Enable Voltage (top) (V)
Output Voltage FAST (middle) (V)
Output Voltage SLOW (bottom) (V)
0.25
6
5
4
3
2
1
0
-1
6
0.7
5
0.6
0.5
4
0.4
3
0.3
2
0.2
1
0.1
0
0
Time (5µs/div)
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Input Current (bottom) (A)
6
0.3
3
2.5
Output Turn-On
Time (500µs/div)
0.35
3.5
Input Current (bottom) (A)
6
Enable Voltage (top) (V)
Output Voltage (middle) (V)
(VIN = 3V; RL = 20Ω)
Input Current (bottom) (A)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
(VIN = 5V;
= 10Ω)
VINR=L 3.6V
VIN = 2.7V
DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Typical Characteristics
VIN = 5V, TA = 25°C unless otherwise noted.
Output Turn-Off
0.35
3.5
0.3
3
0.25
2.5
0.2
2
0.15
1.5
0.1
1
0.05
0.5
0
0
Input Current (bottom) (A)
Enable Voltage (top) (V)
Output Voltage (middle) (V)
(VIN = 3V; RL = 20Ω)
Time (5µs/div)
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DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Functional Block Diagram
OUTA
INA
Turn-On Slew
Rate Control
Level
Shift
*
ENA
FAST
OUTB
INB
Turn-On Slew
Rate Control
Level
Shift
*
ENB
GND
*AAT4252A-3 version only
8
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DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Functional Description
The AAT4252A is a family of flexible dual P-channel
MOSFET power switches designed for high-side load
switching applications. There are three versions of the
AAT4252A with different turn-on and turn-off characteristics to choose from, depending upon the specific
requirements of an application.
The first version, the AAT4252A-1, has a moderate turnon slew rate feature, which reduces in-rush current
when the MOSFET is turned on. This function allows the
load switch to be implemented with either a small input
capacitor or no input capacitor at all. During turn-on
slewing, the current ramps linearly until it reaches the
level required for the output load condition. The proprietary turn-on current control method works by careful
control and monitoring of the MOSFET gate voltage.
When the device is switched ON, the gate voltage is
quickly increased to the threshold level of the MOSFET.
Once at this level, the current begins to slew as the gate
voltage is slowly increased until the MOSFET becomes
fully enhanced. Once it has reached this point the gate
is quickly increased to the full input voltage and the
RDS(ON) is minimized.
The second version, the AAT4252A-2, is a very fast
switch intended for high-speed switching applications.
This version has no turn-on slew rate control and no
special output discharge features.
The final switch version, the AAT4252A-3, has the addition of a minimized slew rate limited turn-on function and
a shutdown output discharge circuit to rapidly turn off a
load when the load switch is disabled through the ON/OFF
pin. Using the FAST input pin on the AAT4252A-3, the
device can be manually switched to a slower slew rate.
All versions of the AAT4252A operate with input voltages
ranging from 1.5V to 6.5V. All versions of this device
have extremely low operating current, making them
ideal for battery-powered applications.
The ON/OFF control pin is TTL compatible and will also
function with 2.5V to 5V logic systems, making the
AAT4252A an ideal level-shifting load switch.
Applications Information
Input Capacitor
A 1μF or larger capacitor is typically recommended for
CIN in most applications. A CIN capacitor is not required
for basic operation; however, it is useful in preventing
load transients from affecting upstream circuits. 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 CIN,
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
For proper slew operation, a 0.1μF capacitor or greater
is required between VOUT and GND. Likewise, with the
output capacitor, there is no specific capacitor ESR
requirement. If desired, COUT may be increased without
limit to accommodate any load transient condition without adversely affecting the slew rate.
Enable Function
The AAT4252A features an enable / disable function.
This pin (ON) is active high and is compatible with TTL
or CMOS logic. To assure the load switch will turn on, the
ON control level must be greater than 2.0V. The load
switch will go into shutdown mode when the voltage on
the ON pin falls below 0.8V. When the load switch is in
shutdown mode, the OUT pin is tri-stated, and quiescent
current drops to leakage levels below 1μA.
Reverse Output-to-Input Voltage
Conditions and Protection
Under normal operating conditions, a parasitic diode
exists between the output and input of the load switch.
The input voltage should always remain greater than the
output load voltage, maintaining a reverse bias on the
internal parasitic diode. Conditions where VOUT might
exceed VIN should be avoided since this would forward
bias the internal parasitic diode and allow excessive current flow into the VOUT pin, possibly damaging the load
switch. In applications where there is a possibility of VOUT
exceeding VIN for brief periods of time during normal
operation, the use of a larger value CIN capacitor is
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DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
highly recommended. A larger value of CIN with respect
to COUT will effect a slower CIN decay rate during shutdown, thus preventing VOUT from exceeding VIN. In applications where there is a greater danger of VOUT exceeding
VIN for extended periods of time, it is recommended to
place a Schottky diode from VIN to VOUT (connecting the
cathode to VIN and anode to VOUT). The Schottky diode
forward voltage should be less than 0.45V.
Thermal Considerations and
High Output Current Applications
The AAT4252A is designed to deliver a continuous output
load current. The limiting characteristic for maximum
safe operating output load current is package power dissipation. In order to obtain high operating currents,
careful device layout and circuit operating conditions
must be taken into account.
The following discussions will assume the load switch is
mounted on a printed circuit board utilizing the minimum recommended footprint as stated in the Printed
Circuit Board Layout Recommendations section of this
datasheet.
At any given ambient temperature (TA), the maximum
package power dissipation can be determined by the following equation:
PD(MAX) =
TJ(MAX) - TA
θJA
Constants for the AAT4252A are maximum junction temperature (TJ(MAX) = 125°C1) and package thermal resistance (θJA = 160°C/W). Worst case conditions are calculated at the maximum operating temperature, TA =
85°C. Typical conditions are calculated under normal
ambient conditions where TA = 25°C. At TA = 85°C,
PD(MAX) = 250mW. At TA = 25°C, PD(MAX) = 625mW.
The maximum continuous output current for the AAT4252A
is a function of the package power dissipation and the RDS
of the MOSFET at TJ(MAX). The maximum RDS of the MOSFET
at TJ(MAX) is calculated by increasing the maximum room
temperature RDS by the RDS temperature coefficient. The
temperature coefficient (TC) is 2800ppm/°C. Therefore, at
125°C:
RDS(MAX) = RDS(25°C) · (1 + TC · ΔT)
RDS(MAX) = 155mΩ · (1 + 0.002800 · (125°C - 25°C))
RDS(MAX) = 198mΩ
For maximum current, refer to the following equation:
IOUT(MAX) <
PD(MAX)
RDS
For example, if VIN = 5V, RDS(MAX) = 198mW, and TA =
25°C, IOUT(MAX) = 1.8A. If the output load current were to
exceed 1.8A or if the ambient temperature were to
increase, the internal die temperature would increase
and the device would be damaged. Higher peak currents
can be obtained with the AAT4252A. To accomplish this,
the device thermal resistance must be reduced by
increasing the heat sink area or by operating the load
switch in a duty cycle manner. Duty cycles with peaks
less than 2ms in duration can be considered using the
method below.
High Peak Output Current Applications
Some applications require the load switch to operate at
a continuous nominal current level with short duration,
high-current peaks. Refer to the IDM specification in the
Absolute Maximum Ratings table to ensure the
AAT4252A’s maximum pulsed current rating is not
exceeded. The duty cycle for both output current levels
must be taken into account. To do so, first calculate the
power dissipation at the nominal continuous current
level, and then add the additional power dissipation due
to the short duration, high-current peak scaled by the
duty factor. For example, a 4V system using an AAT4252A
operates at a continuous 100mA load current level and
has short 2A current peaks, as in a GSM application. The
current peak occurs for 576μs out of a 4.61ms period.
First, the current duty cycle is calculated:
% Peak Duty Cycle =
x
576µs
=
100
4.61ms
% Peak Duty Cycle = 12.5%
1.The actual maximum junction temperature of AAT4252A is 150°C. However, good design practice is to derate the maximum die temperature down to 125°C to prevent the
possibility of over temperature damage.
10
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DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
The load current is 100mA for 87.5% of the 4.61ms
period and 2A for 12.5% of the period. Since the
Electrical Characteristics do not report RDS(MAX) for 4V
operation, it must be approximated by consulting the
chart of RDS(ON) vs. VIN. The RDS reported for 5V at 100mA
and 2A can be scaled by the ratio seen in the chart to
derive the RDS for 4V VIN at 25°C : 155mW · 90mW/87mW
= 160.3mW. De-rated for temperature: 160.3mW · (1 +
0.002800 · (125°C -25°C)) = 205mW. The power dissipation for a 100mA load is calculated as follows:
PD(MAX) = IOUT2 · RDS
PD(100mA) = (100mA)2 · 205mW
PD(100mA) = 2.05mW
PD(87.5%D/C) = %DC · PD(100mA)
PD(87.5%D/C) = 0.875 · 2.05mW
PD(87.5%D/C) = 1.8mW
PD(MAX) = IOUT2 · RDS
PD(2A) = (2A)2 · 205mW
PD(2A) = 820.97mW
PD(12.5%D/C) = %DC · PD(2A)
PD(12.5%D/C) = 0.125 · 820.97mW
PD(12.5%D/C) = 102.6mW
For proper thermal management, and to take advantage
of the low RDS(ON) of the AAT4252A, a few circuit board
layout rules should be followed: VIN and VOUT should be
routed using wider than normal traces, and GND should
be connected to a ground plane. For best performance,
CIN and COUT should be placed close to the package pins.
Evaluation Board Layout
The power dissipation for 2A load at 12.5% duty cycle is
102.6mW. Finally, the two power figures are summed to
determine the total true power dissipation under the
varied load.
The maximum power dissipation for the AAT4252A operating at an ambient temperature of 85°C is 250mW. The
device in this example will have a total power dissipation
of 104.4mW. This is well within the thermal limits for safe
operation of the device; in fact, at 85°C, the AAT4252A
will handle a 2A pulse for up to 30% duty cycle. At lower
ambient temperatures, the duty cycle can be further
increased.
Printed Circuit Board
Layout Recommendations
The power dissipation for 100mA load at 87.5% duty
cycle is 1.97mW. Now the power dissipation for the
remaining 12.5% of the duty cycle at 2A is calculated:
PD(total) = PD(100mA) + PD(2A)
PD(total) = 1.8mW + 102.6mW
PD(total) = 104.4mW
The AAT4252A evaluation layout follows the printed circuit board layout recommendations and can be used for
good applications layout. Refer to Figures 1 and 2.
Note: Board layout shown is not to scale.
Figure 1: AAT4252A Evaluation Board
Top Side Layout. Figure 2: AAT4252A Evaluation Board Bottom Side Layout.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202228A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012
11
DATA SHEET
AAT4252A
Dual Slew Rate Controlled Load Switch
Ordering Information
Device Option
Package
Marking1
Part Number (Tape and Reel)2
AAT4252A-3
TSOPJW-12
WSXYY
AAT4252AITP-3-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
0.055 ± 0.045
All dimensions in millimeters.
0.04 REF
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
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
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12
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202228A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 31, 2012