202130A.pdf

DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
General Description
Features
The AAT3120 is a low noise, constant frequency charge
pump DC/DC converter that uses fractional (1.5X) conversion to improve efficiency for white LED applications.
The device can be used to produce eight current levels
up to 20mA per channel for up to three channels. 1X load
switch mode is also built-in to improve efficiency at low
current settings. Low external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and
OUT) makes the AAT3120 ideally suited for small battery-powered applications.
•VIN Range: 2.7V to 5.5V
• Fractional Charge Pump Mode
• Drives Low-VF and High-VF Type LEDs
• Up to Three LED Outputs
▪ Single Wire Programming
▪ Eight Regulated Current Settings
▪ Max 20mA per Channel
• Low Noise Constant Frequency Operation
• No Inductors
• 1MHz Switching Frequency
• Small Application Circuit
• Automatic Soft-Start
•IQ <1µA in Shutdown
• 12-Pin TSOPJW Package
Skyworks' S2Cwire™ (Simple Serial Control™) serial
digital input is used to enable, disable, and set current
for each LED at eight different levels.
The AAT3120 has a thermal management system to protect the device in the event of a short-circuit condition at
the output pin. Built-in soft-start circuitry prevents
excessive inrush current during start-up. A high charge
pump switching frequency enables the use of very small
external capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current
to less than 1µA. The AAT3120 is available in the very
small Pb-free 12-pin TSOPJW package.
Applications
•
•
•
•
Color (RGB) Lighting
Programmable Current Source
White LED Backlighting
White Photo Flash for DSCs
Typical Application
VIN
C1+
C1
1µF
C1C2+
VOUT
VBATTERY
CIN
1µF
C OUT
1µF
AAT3120
C2
1µF
C2-
EN/SET
EN/SET
GND
D1
D2
D3
D3
D2
D1
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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1
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Pin Descriptions
Pin #
Symbol
1
2
3
4
5
6
7
8
9
10
11
12
C2+
OUT
C1C1+
N/C
D3
D2
D1
EN/SET
IN
GND
C2-
Function
Flying capacitor 2 positive terminal. Connect a 1µF capacitor between C2+ and C2-.
Charge pump output. Requires 1µF capacitor connected between this pin and ground.
Flying capacitor 1 negative terminal.
Flying capacitor 1 positive terminal. Connect a 1µF capacitor between C1+ and C1-.
No connection.
Current source output #3.
Current source output #2.
Current source output #1.
Control pin.
Input power supply. Requires 1µF capacitor connected between this pin and ground.
Ground.
Flying capacitor 2 negative terminal.
Pin Configuration
TSOPJW-12
(Top View)
C2+
OUT
C1C1+
N/C
D3
2
1
12
2
11
3
10
4
9
5
8
6
7
C2GND
IN
EN/SET
D1
D2
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202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
VIN
VOUT
VEN/SET
VEN/SET(MAX)
IOUT2
TJ
TLEAD
Description
Input Voltage
Charge Pump Output
FB or EN/SET to GND Voltage
Maximum EN/SET to Input Voltage
Maximum DC Output Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec.)
Value
Units
-0.3 to 6
-0.3 to 6
-0.3 to 6
0.3
150
-40 to 150
300
V
V
V
V
mA
°C
°C
Thermal Information3
Symbol
qJA
PD
Description
Thermal Resistance
Maximum Power Dissipation4
Value
Units
160
0.625
°C/W
W
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. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 6.25mW/°C above 25°C.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
3
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Electrical Characteristics1
CIN = COUT = C1 = C2 = 1.0µF; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C, VIN = 3.5V.
Symbol
Description
Input Power Supply
VIN
Operation Range
ICC
Operating Current
ISHDN
Shutdown Current
IDX
Output Current
Current Matching Between Any
I(D-Match)
Two Outputs
Charge Pump Section
TSS
Soft-Start Time
FCLK
Clock Frequency
EN/SET
VEN(L)
Enable Threshold Low
VEN(H)
Enable Threshold High
TEN/SET LO
EN/SET Low Time
TEN/SET HI
Minimum EN/SET High Time
TOFF
EN/SET Off Timeout
Input Current
EN/SET Input Leakage
Conditions
Min
Typ
2.7
3.0V ≤ VIN ≤ 5.5V, Active, No Load Current
EN = 0
3.0 ≤ VIN ≤ 5.5
1.8
18
VD1:D3 = 3.6, VIN = 3.5V
2.7V ≤ VIN ≤ 5.5V
2.7V ≤ VIN ≤ 5.5V
20
Max
Units
5.5
3.0
1.0
22
V
mA
µA
mA
0.5
%
200
1000
µs
kHz
0.4
1.4
0.3
75
50
-1
500
1
V
V
µs
ns
µs
µA
1. The AAT3120 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.
4
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Typical Characteristics
Turn-On to Full-Scale Load Switch
Turn-On to Full-Scale Charge Pump
ENSET
(2V/div)
ENSET
(2V/div)
CP
(2V/div)
CP
(2V/div)
VDIODE
(2V/div)
IIN
(200mA/div)
VDIODE
(2V/div)
IIN
(200mA/div)
Time (100µs/div)
Time (100µs/div)
Turn-Off from Full-Scale Charge Pump
ENSET
(2V/div)
VDIODE
(2V/div)
IIN
(100mA/div)
Time (400µs/div)
IDIODE vs. Input Voltage
IDIODE vs. Input Voltage
(3x8.3mA)
(3x20mA)
30
65
VF = 3.4V
59
56
VF = 3.0V
VF = 3.2V
24
21
VF = 3.0V
VF = 3.2V
18
53
15
50
2.7
VF = 3.4V
27
IDIODE (mA)
IDIODE (mA)
62
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
Input Voltage (V)
4.5
4.7
4.9
5.1
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
4.7
4.9
5.1
Input Voltage (V)
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DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Typical Characteristics
Efficiency vs. Input Voltage
Efficiency vs. Input Voltage
(3x20mA)
(3x8.3mA)
95
95
VF = 3.0V
VF = 3.2V
VF = 3.4V
VF = 3.0V
90
85
Efficiency (%)
Efficiency (%)
90
80
75
70
65
60
55
VF = 3.2V
VF = 3.4V
85
80
75
70
65
60
55
50
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
4.7
4.9
50
2.7
5.1
Input Voltage (V)
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
60mA Load Characteristics
VIN
(10mV/div)
OUT
(20mV/div)
OUT
(2V/div)
VDIODE
(2V/div)
VDIODE
(20mV/div)
IIN
(100mA/div)
Time (100µs/div)
Load Switch to Charge Pump (60mA)
VIN
(10mV/div)
OUT
(2V/div)
VDIODE
(2V/div)
IIN
(100mA/div)
Time (100µs/div)
6
4.7
4.9
5.1
Charge Pump to Load Switch (60mA)
VIN
(20mV/div)
Time (500ns/div)
4.5
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Functional Block Diagram
VIN
C1+
Soft-Start
Control
C11X / 1.5X
Charge
Pump
1MHz
Oscillator
C2+
C2-
Voltage
Reference
OUT
D1
Current
Reference
EN/SET
Single-Wire
Interface
Quad
Output
DAC
D2
D3
32 x 16 bit
ROM
GND
Functional Description
The AAT3120 is a dual mode load switch (1X) and high
efficiency (1.5X) fractional charge pump device intended
for white LED backlight applications. The fractional
charge pump consists of a low dropout linear voltage
regulator followed by a 1.5X charge pump with multiple
current source outputs. To maximize power conversion
efficiency, an internal feedback control sensing circuit
monitors the voltage required on the constant current
source outputs. This control circuit then sets the load
switch and charge pump functions based upon the input
voltage level versus the output voltage level needed. The
1X load switch / 1.5X charge pump mode is decided on
the voltage sensed on the output D1. Switchover between
the 1.5X (charge-pump) operating mode and the 1X
(load switch) mode occurs automatically (as a function of
input and output voltages) and does not require user
intervention to maintain maximum efficiency.
The AAT3120 requires only four external components:
two 1µF ceramic capacitors for the charge pump flying
capacitors (C1 and C2), one 1µF ceramic input capacitor
(CIN), and one 0.33µF to 1µF ceramic output capacitor
(COUT). The LDO / 1.5X charge pump output is converted
into three (D1 to D3) constant current outputs to drive
three individual LEDs with a maximum current of 20mA
each. The current source output magnitude is controlled
by the EN/SET serial data single-wire interface. The
interface records rising edges of the EN/SET pin and
decodes them into eight individual current level settings
(see Table 1, Current Level Settings). Once the final
clock cycle is input for the desired brightness level, the
EN/SET pin is held high to maintain the device output
current at the programmed level. The device is disabled
500µs after the EN/SET pin transitions to a logic low
state.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Code
IOUT, Each LED (mA)
1
2
3
4
5
6
7
8
0
0.5
1.3
3.3
8.3
11.1
15
20
Table 1: Current Level Settings.
Constant Current Output Level Settings
The constant current source output amplitude for output
D1 to D3 is set via the serial interface. Because the outputs D1 to D3 are true independent constant current
sources, the voltage observed on any single given output
will be determined by the actual forward voltage (VF) for
the LED being driven.
Since the output current of the AAT3120 is programmable through its simple single-wire serial interface, no
PWM (pulse width modulation) or additional control circuitry is needed to control LED brightness. This feature
greatly reduces the burden on a microcontroller or system IC to manage LED or display brightness, allowing
the user to “set it and forget it.”
EN/SET Serial Interface
The current source output magnitude is controlled by the
EN/SET serial data single-wire interface. The interface
records rising edges of the EN/SET pin and decodes
them into eight individual current level settings. Code 8
is full scale.
The counter can be clocked at speeds up to 1MHz, so
intermediate states are not visible. The first rising edge
of EN/SET enables the IC and initially sets the output
LED current to zero. The next lowest setting is equal to
525µA. Once the final clock cycle is input for the desired
brightness level, the EN/SET pin is held high to maintain
the device output current at the programmed level. The
device is disabled 500µs after the EN/SET pin transitions
to a logic low state. The EN/SET timing is designed to
accommodate a wide range of data rates. After the first
rising edge of EN/SET, the charge pump is enabled and
reaches full capacity after the soft-start time (TSS).
During the soft-start time, multiple clock pulses may be
entered on the EN/SET pin to set the final output current
level with a single burst of clocks. Alternatively, the EN/
SET clock pulses may be entered one at a time to gradually increase the LED brightness over any desired time
period. A constant current is sourced as long as EN/SET
remains in a logic high state. The current source outputs
are switched off after EN/SET has remained in a low
state for at least the TOFF timeout period.
Test Current/Channel Disable
Each channel of the output is equipped with a test current function. A small amount of current (~2µA) is
injected into each output current source to detect the
presence of load (LED). For unused channels that are
tied to ground or load LED fail short, those channels will
be automatically disabled instead of wasting the programmed output current.
EN/SET Timing
tLO
tHI
tOFF
EN/SET
Code
8
OFF
1
2
3
OFF
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Applications Information
LED Selection
The AAT3120 is specifically intended for driving white
LEDs. However, the device design will allow the AAT3120
to drive most types of LEDs with forward voltage specifications ranging from 2.0V to 4.3V. LED applications
may include main and sub-LCD display backlighting,
camera photo-flash applications, color (RGB) LEDs,
infrared (IR) diodes for remotes, and other loads benefiting from a controlled output current generated from a
varying input voltage. Since the D1 to D3 output current
sources are matched with negligible voltage dependence, the LED brightness will be matched regardless of
the specific LED forward voltage (VF) levels.
any given application, white LED forward voltage levels
can differ, yet the output drive current will be maintained
as a constant. This makes quantifying output power a
difficult task when taken in the context of comparing to
other white LED driver circuit topologies. A better way to
quantify total device efficiency is to observe the total
input power to the device for a given LED current drive
level. The best white LED driver for a given application
should be based on trade-offs of size, external components count, reliability, operating range, and total energy usage...not just % efficiency.
In some instances (e.g., in high-luminous-output applications such as photo-flash) it may be necessary to drive
high-VF type LEDs. The low-dropout current-sources in
the AAT3120 make it capable of driving LEDs with forward voltages as high as 4.3V at full current from an
input supply as low as 3.0V. Outputs can be paralleled to
drive high current LEDs without complication.
The AAT3120 efficiency may be quantified under very
specific conditions and is dependent upon the input voltage versus the output voltage seen across the loads
applied to outputs D1 through D3 for a given constant
current setting. Depending upon the case of VIN being
greater than the specific voltage seen across the load on
D1, the device will operate in “load switch” mode. If the
voltage seen on the constant current source output is
less than VIN, then the device will operate in 1.5X charge
pump mode. Each of these two modes will yield different
efficiency values. One should refer to the following two
sections for explanations of each operational mode.
Device Switching Noise Performance
Load Switch Mode Efficiency
The AAT3120 operates at a fixed frequency of approximately 1MHz to control noise and limit harmonics that
can interfere with the RF operation of cellular telephone
handsets or other communication devices. Back-injected
noise appearing on the input pin of the charge pump is
20mV peak-to-peak, typically ten times less than inductor-based DC/DC boost converter white LED backlight
solutions. The AAT3120 soft-start feature prevents noise
transient effects associated with in-rush currents during
start up of the charge pump circuit.
The AAT3120 load switch mode is operational at all
times. It functions alone to enhance device power conversion efficiency when the condition exists where VIN is
greater than the voltages at the constant current source
outputs. When in “load switch” mode, the voltage conversion efficiency is defined as output power divided by
input power:
Power Efficiency and Device Evaluation
The charge pump efficiency discussion in the following
sections only accounts for efficiency of the charge pump
section itself. Due to the unique circuit architecture and
design of the AAT3120, it is very difficult to measure
efficiency in terms of a percent value comparing input
power over output power.
Since the AAT3120 outputs are pure constant current
sources and typically drive individual loads, it is difficult
to measure the output voltage for a given output (D1 to
D3) to derive an overall output power measurement. For
η=
POUT
PIN
The expression to define the ideal efficiency (h) can be
rewritten as:
η=
POUT VOUT ∙ IOUT VOUT
=
=
PIN
VIN ∙ IOUT
VIN
-or-
η(%) = 100
 VOUT 
 VIN 
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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9
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Charge Pump Section Efficiency
Ballast Resistors for Current Matching
The AAT3120 contains a fractional charge pump which
will boost the input supply voltage in the event where VIN
is less than the voltage required on the constant current
source outputs. The efficiency (h) can be simply defined
as a linear voltage regulator with an effective output
voltage that is equal to one and one half times the input
voltage. Efficiency (h) for an ideal 1.5X charge pump can
typically be expressed as the output power divided by
the input power.
In some applications, white LED forward voltages can
vary significantly. Ballast resistors between the LED
cathodes and ground are recommended for balancing
the forward voltage differences. The ballast resistor
value may be approximated by the following equation:
RB =
VSOURCE - VF
IF
Capacitor Selection
P
η = OUT
PIN
In addition, with an ideal 1.5X charge pump, the output
current may be expressed as 2/3 of the input current.
The expression to define the ideal efficiency (h) can be
rewritten as:
η=
POUT
VOUT ∙ IOUT
VOUT
=
=
PIN
VIN ∙ 1.5IOUT 1.5VIN
Capacitor Characteristics
-or-
η(%) = 100
 VOUT 
 1.5VIN
For a charge pump with an output of 5 volts and a nominal input of 3.5 volts, the theoretical efficiency is 95%.
Due to internal switching losses and IC quiescent current
consumption, the actual efficiency can be measured at
93%. These figures are in close agreement for output load
conditions from 1mA to 100mA. Efficiency will decrease as
load current drops below 0.05mA or when level of VIN
approaches VOUT. Refer to the Typical Character­istics section of this datasheet for measured plots of efficiency
versus input voltage and output load current for the given
charge pump output voltage options.
10
Careful selection of the four external capacitors CIN, C1,
C2, and COUT is important because they will affect turn-on
time, output ripple, and transient performance. Optimum
performance will be obtained when low Equivalent Series
Resistance (ESR) ceramic capacitors are used. In general, low ESR may be defined as less than 100mW. A
value of 1µF for all four capacitors is a good starting
point when choosing capacitors. If the LED current
sources are only programmed for light current levels,
then the capacitor size may be decreased.
Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the
AAT3120. Ceramic capacitors offer many advantages
over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is
lowest cost, has a smaller PCB footprint, and is nonpolarized. Low ESR ceramic capacitors help maximize
charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect
connection damage.
Equivalent Series Resistance
ESR is an important characteristic to consider when
selecting a capacitor. ESR is a resistance internal to a
capacitor, which is caused by the leads, internal connections, size or area, material composition, and ambient
temperature. Capacitor ESR is typically measured in milliohms for ceramic capacitors and can range to more
than several ohms for tantalum or aluminum electrolytic
capacitors.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Ceramic Capacitor Materials
Thermal Protection
Ceramic capacitors less than 0.1µF are typically made
from NPO or C0G materials. NPO and C0G materials
typically have tight tolerance and are stable over temperature. Large capacitor values are typically composed
of X7R, X5R, Z5U, or Y5V dielectric materials. Large
ceramic capacitors, typically greater than 2.2µF, are
often available in low-cost Y5V and Z5U dielectrics, but
capacitors greater than 1µF are typically not required for
AAT3120 applications.
The AAT3120 has a thermal protection circuit that will
shut down the internal LDO and charge pump if the die
temperature rises above the thermal limit, as is the case
during a short circuit of the OUT pin.
Capacitor area is another contributor to ESR. Capacitors
that are physically large will have a lower ESR when
compared to an equivalent material smaller capacitor.
These larger devices can improve circuit transient
response when compared to an equal value capacitor in
a smaller package size.
Charge Pump Compatibility
The AAT3120 is pin-compatible with the AAT3113 in
TSOPJW-12 packages, with no D4 output. Compared to
the AAT3113, the AAT3120 offers an improved overall
efficiency, wider operating range, and the ability to drive
high-VF type LEDs (up to 4.3V) at full current from a 3V
input condition. The AAT3120 is well suited for batterypowered applications using single-cell Lithium-Ion
(Li-Ion) batteries (4.2V to 2.8V), Lithium Polymer batteries, and 3-series connected dry cells (3.6V).
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
11
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Additional Application Circuits
VIN
C1+
C1
1µF
C1C2+
VOUT
VBATTERY
C IN
1µF
COUT
1µF
AAT3120
C2
1µF
C2D1
D2
D3
EN/SET
EN/SET
Display Module
GND
D1
D2
D3
R
R
R
AAT3120 Driving a Display Module with Three Paralleled White LEDs.
VIN
C1+
C1
1µF
C1C2+
VOUT
VBATTERY
CIN
1µF
C OUT
1µF
AAT3120
C2
1µF
C2-
EN/SET
EN/SET
Common-Anode
RGB Color LED
D1
D2
D3
GND
RED
GRN
BLU
R
R
R
Enable Red
Enable Green
Enable Blue
AAT3120 Driving Common-Anode RGB Color LED.
12
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
DATA SHEET
AAT3120
Three-Channel Charge Pump for White LED Applications
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
TSOPJW-12
NGXYY
AAT3120ITP-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
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
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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202130A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 4, 2012
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