Skyworks AAT1218 High current, 1.2mhz synchronous boost converterr Datasheet

DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
General Description
Features
The AAT1218 is a general purpose DC/DC synchronous
boost (step-up) converter providing a tightly regulated
DC output voltage for continuous output currents up to
1A (minimum). The maximum peak current in the boost
switch is limited to a value of 2A (minimum). Operating
input voltage must be less than the output voltage and
in the 0.5V to 5.5V range, making the device well suited
to portable equipment and consumer appliances.
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•
•
The boost output voltage is programmed from 2.5V to
5.5V with an external resistor divider. Optimized internal
compensation provides fast transient response with no
external components.
Synchronous rectification eliminates the need for an
external rectifier for output voltage less than 4.5V. Low
on-resistance internal switches provide efficiency up to
95%, which minimizes losses and simplifies packaging
and circuit board layout. An inductor, two resistors and
two ceramic output capacitors are all that are required to
implement a DC/DC boost solution.
The switching frequency is internally set to 1.2MHz to
minimize external filter size and optimize switching
losses.
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•
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•
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•
Integrated soft-start ensures minimal inrush current.
The “anti-ring” circuit reduces stray EMI during light
load, discontinuous operation. Input quiescient current is
less than 400μA at no load.
•
The device provides cycle-by-cycle current limit and overtemperature protection to prevent device over-stress.
•
•
•
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•
•
The AAT1218 is available in a Pb-free, 12-pin low profile
TDFN33 package with rating from -40°C to 85°C.
2.5V to 5.5V Adjustable Output Voltage
0.5V Minimum Input Voltage
±2% Output Accuracy
No Schottky Diode Required (VOUT < 4.5V)
Up to 95% Efficiency
400μA Standby Current
<1μA Shutdown Current
Integrated Soft-Start Circuitry Limits Inrush Current
Constant Frequency 1.2MHz Operation
▪ Inductor Height <1.8mm
▪ Small Ceramic Capacitors
Anti-ring Circuit Reduces EMI
Current Mode Control
▪ Fast, Stable Transient Response
▪ No External Compensation
▪ Cycle-by-Cycle Current Limit
Low Inrush Current with 0.7ms Soft-start
Low Output Ripple: <80mVpp for all Loading Conditions
(BW = 25MHz)
Over-Temperature Protection
Adjustable and Fixed Output Versions Available
Delivers 1A to 5V Output from a Single Cell Li+
Battery
Low-profile TDFN33-12 Package
Applications
DVD Players
Hard Disk Drive
MP3 Players
PDA
Portable Computers
Smart Phones
Typical Application
V IN: 3.6V
L1
2.2µH
V OUT: 5V @ 1A
LX
VIN: 3.6V
EN
FB
PGND
OUT
VIN
AAT1218-1.2
AAT1218-5.0
GND
VOUT: 5V @ 1A
LX
OUT
VIN
C IN
22µF
0805
L1 2.2µH
COUT
44µF
(2x22µF)
0805
CIN
22µF
0805
R2
1.02M
EN
FB
GND
R3
324k
COUT
44µF
(22µF x2)
0805
PGND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
1
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Pin Description
Pin #
Symbol
1
LX
2, 5
3
4
6, 7
NC
VIN
EN
GND
8
FB
9. 10
11, 12
OUT
PGND
Description
Switching node tied to drain of internal N-channel MOSFET and source of internal P-channel MOSFET. Connect this pin to the external power inductor.
No connect.
Input voltage for the controller.
Input enable pin.
Non-power signal ground pin.
Feedback input pin. This pin is connected to an external resistor divider which determines the output voltage
setpoint.
Output pin; connected to the positive terminal of the output capacitor and to the external resistor divider.
Power ground pin. Connect this pin directly to input and output capacitors.
Pin Configuration
TDFN33-12
(Top View)
2
LX
1
12
PGND
N/C
2
11
PGND
VIN
3
10
OUT
EN
4
9
OUT
N/C
5
8
FB
GND
6
7
GND
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DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Absolute Maximum Ratings1
Symbol
Description
LX, VIN, EN, FB Voltage to PGND
PGND Voltage to GND
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
Units
-0.3 to 6.0
-0.3 to 0.3
-40 to 150
300
V
V
C
C
Value
Units
2000
50
41.68
mW
C/W
C/W
Thermal Information
Symbol
PD
JA
JC
Description
Maximum Power Dissipation2
Maximum Thermal Resistance – Junction to Ambient
Maximum Thermal Resistance – Junction to Case
TDFN33-123
TDFN33-12
TDFN33-12
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. Mounted on 1.6mm thick FR4 circuit board.
3. Derate 25mW/°C above 25°C ambient temperature.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
3
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Electrical Characteristics
VIN = 1.2V, VOUT = 3.3V, COUT = 44μF, TA = 25°C unless otherwise noted.
Symbol
VIN
VOUT_RANGE
VFB
IQ
FOSC
DC
ILIMIT
TSS
NMOS Leakage
PMOS Leakage
NMOS On-Resistance
PMOS On-Resistance
Description
Conditions
Minimum Start-Up Voltage
Minimum Start-Up Voltage Loaded
ILOAD = 1mA
ILOAD = 300mA (Resistive)
Operating Input Voltage Range
TA = -40°C to +85°C
0.5
TA = -40°C to +85°C
2.5
1.164
Output Voltage Range
Feedback Voltage
Quiescient Current
Switching, No Load Operation,
Measured from VOUT
Quiescient Current
Device Disabled (Shut Down)
Switching Frequency
Minimum Operating Duty Cycle
Maximum Operating Duty Cycle
NMOS Current Limit
Soft-Start Time
NMOS Switch Leakage
PMOS Switch Leakage
NMOS Switch On-Resistance
PMOS Switch On-Resistance
ΔVOUT
Line Regulation
ΔVOUT
Load Regulation
ΔVOUT(LINE_TRANSIENT)
Line Transient Response1
ΔVOUT(LOAD_TRANSIENT)
Load Transient Response1
Min
Typ
Max
Units
0.85
1.4
1
V
V
1.200
VOUT 0.5
5.5
1.236
0.5 < VIN < VOUT - 0.5V, ILOAD = 0mA
300
700
μA
0.5 < VIN < VOUT - 0.5V, VEN = 0
0.01
1
μA
1.2
1.5
0
MHz
%
%
A
ms
μA
μA
mΩ
mΩ
0.95
TA = -40°C to +85°C
VIN = 3.3V, VOUT = 5V, COUT = 10μF
VIN = 1.5 - (VOUT - 0.5),
ILOAD = 0mA to 1000mA
VIN = 1.5 - (VOUT - 0.5),
ILOAD = 0mA to 1000mA
VIN = 2.5V - 4.5V, ΔVIN = 1V,
dVIN/dt = ±0.2V/μs
VIN = 2.5V, ILOAD = 50mA to 500mA,
dILOAD/dt = ±0.5A/μs, CFF = 100pF
80
2.0
2.5
0.7
0.1
0.1
180
250
5.0
5.0
V
V
V
0.1
%
0.5
%
-3
3
% VOUT
-10
10
% VOUT
0.6
V
EN
VEN(L)
VEN(H)
IEN
Logic Input Low Threshold for EN
Logic Input High Threshold for EN
Enable Input Low Current
VOUT = 3.3V
VOUT = 5.0V
VIN = VOUT = 5.5V
0.85
1.0
-1.0
V
1.0
1. Specifications are guaranteed by design and characterization.
4
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μA
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Typical Characteristics
CIN = 22μF, COUT = 44μF; L = 2.2μH; TA = 25°C, unless otherwise noted.
AAT1218 ISD vs. Temperature
AAT1218 IQ vs. Temperature
(VOUT = 5.5V, Measured From VOUT)
1
390
385
IQ_5.5V (µA)
ISD (µA)
0.8
0.6
0.4
0.2
0
-40
380
375
370
365
-15
10
35
60
360
-40
85
-15
10
VEN(H) vs. Temperature
85
60
85
VEN(L) vs. Temperature
(VOUT = 5.0V)
(VOUT = 5V)
0.94
0.86
0.9
0.82
VEN(L) (V)
VEN(H) (V)
60
Temperature (°C)
Temperature (°C)
0.86
0.82
0.78
0.74
0.70
0.78
0.74
-40
35
-15
10
35
60
0.66
-40
85
-15
10
35
Temperature (°C)
Temperature (°C)
Maximum Load Current vs. VIN
AAT1218 VFB vs. Temperature
1.236
10000
Load Current (mA)
1.227
VFB (V)
1.218
1.209
1.200
1.191
1.182
1.173
1.164
-40
-15
10
35
Temperature (°C)
60
85
1000
100
10
0.85
VOUT = 3.3V
VOUT = 5V
1.35
1.85
2.35
2.85
3.35
3.85
4.35
4.85
Input Voltage (V)
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5
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Typical Characteristics
CIN = 22μF, COUT = 44μF; L = 2.2μH; TA = 25°C, unless otherwise noted.
Maximum Load Current at Startup vs. VIN
AAT1218 3.3V Output Efficiency
10000
100
80
Efficiency (%)
Load Current (mA)
90
1000
100
10
0.85
1.85
2.35
2.85
3.35
3.85
4.35
60
50
40
30
VIN = 1.2V
VIN = 1.5V
VIN = 1.8V
VIN = 2.4V
20
VOUT = 3.3V
VOUT = 5V
1.35
70
10
0
0.1
4.85
1
10
AAT1218 5.0V Output Efficiency
AAT1218 5.0V Output Efficiency
100
100
90
90
80
70
60
50
40
30
VIN = 1.2V
VIN = 1.5V
VIN = 2.4V
20
10
0
0.1
1
10
100
1000
Efficiency (%)
80
Efficiency (%)
1000
ILOAD (mA)
Input Voltage (V)
70
60
50
40
VIN = 3.0V
VIN = 3.3V
VIN = 3.6V
VIN = 4.2V
30
20
10
0
0.1
1
ILOAD (mA)
10
100
1000
ILOAD (mA)
Load Transient
Soft Start Waveform
(VIN = 2.0V; VOUT = 3.3V; COUT = 44µF; CFF = 100pF)
(VIN = 1.5V; VOUT = 5V; Load = 100mA)
LX
(4V/div)
VOUT
(200mV/div)
3.3V
VOUT
(4V/div)
500mA
ILOAD
(0.25A/div)
IIN
(0.5A/div)
50mA
VEN
(1V/div)
Time (100µs/div)
6
100
0
0
0
0
Time (200µs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
10000
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Typical Characteristics
VIN = 3.6V, VOUT = 3.6V, CIN = 22μF, COUT = 44μF; L = 2.2μH; TA = 25°C, unless otherwise noted.
VOUT
(AC Coupled)
(20mV/div)
LX
(2V/div)
Anti-Ringing Operation
Power Saving Mode Waveform
(VIN = 3V; VOUT = 5V; Load = 10mA)
(VIN = 3.6V; VOUT = 5V; Load = 5mA)
IL
(250mA/div)
VIN
(AC Coupled)
(20mV/div)
VOUT
(AC Coupled)
(20mV/div)
0
0
0
0
0
LX
(2V/div)
0
Time (0.2µs/div)
Time (4µs/div)
PWM Mode Waveform
(VIN = 3.6V; VOUT = 5V; Load = 1A)
IL
(1A/div)
VIN
(AC Coupled)
(20mV/div)
VOUT
(AC Coupled)
(20mV/div)
LX
(2V/div)
0
0
0
0
Time (0.4µs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
7
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Functional Block Diagram
Soft Start
VIN 1.4V–5.5V
VIN
L1
Slope
Compensation
Vss
Start-Up
Current Limit
–
LX
MUX
VOUT
GOOD
– 2.3V
OUT
Current
Sense
CIN
COUT
Antiringing
Control
To VIN
Bandgap
1.2V
+
FB
VOUT
R1
R2
PWM
Logic
+
Comp
EA
–
–
Enable Logic
EN
Shutdown
Control
Functional Description
The AAT1218 is a synchronous step-up DC-DC converter.
It utilizes internal MOSFETs to achieve high efficiency
over the full load current range. It operates at a fixed
switching frequency of 1.2MHz, and uses the slope compensated current mode architecture. The device can
operate at 0.5V input after start up. The typical start-up
voltage is 0.85V.
Synchronous Rectification
The AAT1218 integrates a synchronous rectifier to
improve efficiency and eliminate the external rectifier
diode if output voltage is lower than 4.5V. The synchronous rectifier is used to reduce conduction loss contributed by the forward voltage of the external rectifier
8
+
Start-Up
Oscillator
PGND
SHUTDOWN
Oscillator
1.2MHz
GND
diode. It is implemented by a PMOS driven by a gate
driver with break-before-make timing. When the output
voltage is greater than 4.5V, an external rectifier diode
is necessary for proper operation.
Low Voltage Start-Up
The AAT1218 can start up at supply voltages as low as
1V. During the start-up phase, the internal low voltage
start-up circuitry controls the NMOS switch to soft-start
the device. A comparator (VOUT GOOD Comp) monitors
the output voltage. If VOUT exceeds 2.3V, the device exits
start-up phase and enters normal operation mode. The
internal circuitry power supply of the device is connected
to VIN during start-up phase and automatically switches
to VOUT during normal operation.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Integrated Soft-Start
During start-up, the AAT1218's integrated soft-start circuitry gradually increases the peak inductor current until
it reaches normal operating value. The inrush current
during start-up can thus be minimized.
Current Mode PWM Control
The AAT1218 is based on a slope compensated current
mode control topology. It operates at a fixed frequency
of 1.2MHz. At the beginning of each clock cycle, the main
switch (NMOS) is turned on and the inductor current
starts to ramp up. After the maximum duty cycle or if the
sense current signal is equal to the error amplifier (EA)
output, the main switch is turned off and the synchronous switch (PMOS) is turned on. This control scheme
has intrinsic cycle-by-cycle current limiting, which can
prevent the main switch from overstress and prevent
saturation of the external inductor.
Power Saving Mode
At very light load, the AAT1218 automatically switches
into Power Saving Mode to improve efficiency. In this
mode, the PWM control will skip some pulses to maintain
regulation. If load increases and output voltage drops,
the device will automatically switch back to regular PWM
mode and maintain regulation.
Anti-ringing Control
Anti-ringing circuitry is included to remove the high frequency ringing that appears on the LX pin when the
inductor current decreases to zero. In this case, ringing
on the LX pin is caused by energy stored in parasitics of
the MOSFETs and the inductor. The anti-ringing circuitry
clamps the voltage to battery voltage internally and thus
dampens the ringing.
Device Enable
When EN is set logic high, the AAT1218 begins operation.
If EN is set logic low, the device is goes into shutdown
mode and consumes less than 1μA current. After startup, the internal circuitry is supplied by VOUT during normal
operation. However, if shutdown mode is enabled, the
internal circuitry will again be supplied by the battery.
Application Information
Setting the Output Voltage
An external resistor divider is used to set the output voltage. The output voltage of the switching regulator (VOUT)
is determined by the following equation:
R1⎞
⎛
VOUT = 1.20V · 1 + R2
⎝
⎠
VOUT
R1 (Ω)
R2 (Ω)
3.3V
5.0V
1.02M
1.02M
576k
324k
Table 1: Resistor Selection Example for Output
Voltage Setting.
Fixed output voltage devices are also available for 3.3V
and 5V outputs. These devices integrate the feedback
network into the die and can save two external resistors.
Do not connect any component to the FB pin and leave
it floating.
Inductor Selection
The AAT1218's high switching frequency of 1.2MHz
allows for small surface mount inductors. For most
designs, the AAT1218 operates with inductors of 2.2μH
to 10μH depending on input/output voltage and load current. First determine the worst case VIN, VOUT, and IOUT.
Then use the equation below to select the proper inductor value; assume the converter is operating in continuous current mode and is in steady state:
VIN
D=1- V
OUT
ΔI
IPEAK = IRMS + 2
VIN · D
ΔI = L · f
SW
η is the converter efficiency, IPEAK is the peak inductor
current, ΔI is the peak-peak inductor ripple current, IRMS
is the RMS current of the inductor current. fsw is the
switching frequency, L is the inductance value and D is
the steady state duty cycle.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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9
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Fit the proper L into the equations to meet the following
criteria:
1.
The DC current rating of the inductor must be higher than IPEAK to avoid magnetic saturation. Cored
inductor devalues when core temperature increases,
so verify the inductor of choice with its temperature
characteristics in mind.
2. The inductor ripple current ΔI is typically set for
20% to 40% of the peak inductor current.
Higher inductance means less inductor ripple current;
larger size inductors can handle more power. However,
larger size inductors also have higher profiles and are
more expensive. For optimum load transient and efficiency performance, low DCR inductors should be selected. Table 2 lists some surface mount inductors which are
suitable for typical AAT1218 applications.
Input Capacitor
Select a 4.7μF to 10μF X7R or X5R ceramic capacitor for
the input. The input capacitor provides a low impedance
loop for the edges of pulsed current drawn by the
AAT1218. Low ESR/ESL X7R and X5R ceramic capacitors are ideal for this function. To minimize stray inductance, the capacitor should be placed as close as possible to the IC. This keeps the high frequency content of
the input current localized, minimizing EMI and input
voltage ripple.
Always examine the ceramic capacitor DC voltage coefficient characteristics to derive the proper value. For
example, the capacitance of a 10μF, 6.3V, X5R ceramic
capacitor with 5.0V DC applied is actually about 6μF.
Manufacturer
Part Number
2D14
CR54
Sumida
CDRH4D22/HP
CDRH5D14/HP
Output Capacitor
The output capacitor limits the output ripple and provides holdup during large load transitions. When choosing the output capacitor, first consider the acceptable
output ripple level (ΔVtoatal) and solve for COUT from the
equations below; assume that output current remains
constant in steady state:
ΔVTOTAL = ΔV + ΔVESR = ΔV + IOUT · RESR
ΔV =
IOUT · D
COUT · FSW
A 10μF to 47μF X5R or X7R ceramic capacitor typically
provides sufficient bulk capacitance to stabilize the output during large load transitions and has the ESR and
ESL characteristics necessary for low output ripple.
In addition, the output voltage droop during load transient is related to the capacitance of the ceramic output
capacitor. A larger output capacitor helps to reduce voltage droop.
Rectifier Diode Selection
A rectifier diode must be added (D1 in Figure 1) when the
output voltage is greater than 4.5V. The Schottky diode
is optional for output voltages less than 4.5V, but can
improve efficiency by about 2% to 3%. A low forward
voltage Schottky diode is recommended. Its voltage rating should be higher than the output voltage. Thus,
diodes with 10V or more reverse voltage are recommended. The diode rated current can be slightly less than
the peak inductor current to save cost and board space.
L
(μH)
Max DCR
(mΩ)
Rated DC Current
(A)
2.2
3.3
4.7
2.2
3.3
5.0
2.2
3.5
4.7
2.0
3.3
5.1
94
125
169
23.4
28.6
44.2
44.3
65.1
82.6
57
96
140
1.50
1.2
1.0
3.84
3.20
2.60
3.2
2.5
2.2
3.2
2.6
2.0
Size
WxLxH (mm)
3.2x3.2x1.55
5.6x6.1x4.85
5.0x5.0x2.4
6.0x6.3x1.5
Table 2: AAT1218 Typical Surface Mount Inductors.
10
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Load Disconnect in Shutdown
In a conventional synchronous step-up converter, a conduction path exists from battery to output through the
body diode of the PMOS during shutdown. To avoid output side circuitry drawing current from VIN, special application circuitry such as that shown in Figure 1 is necessary to disconnect the output from VIN during shutdown.
PCB Layout Guidance
The AAT1218 typically operates at 1.2MHz. Since this is
a high frequency for DC-DC converters, PCB layout is
critical to guarantee satisfactory performance. It is recommended to make traces of the power loop as short
and wide as possible, especially where the switching
L1 2.2μH
node is involved. First, the inductor and input and output
capacitors should be placed close to the IC. Feedback
and shutdown traces should avoid proximity to large AC
signals, e.g. the power inductor and switching nodes.
The optional rectifier diode (D1 in Figure 1 and Figure 2)
can improve efficiency and alleviate the stress on the
integrated PMOS device. The diode should also be close
to the inductor and the chip to form the shortest possible
switching loop. While the two layer PCB shown in Figures
3 and 4 is sufficient for low to moderate power applications, large and integral multi-layer ground planes are
ideal for high power applications since the large area of
copper has lower resistance and higher thermal dissipation capability. The converter’s grounds should join at
one point only. Figure 1 illustrates the schematic for a
typical AAT1218 application.
D1 (Optional)
VOUT
3.3V
LX
Q1 Si2305DS
VIN
CIN
22μF
VOUT
AAT1218
EN
PGND
ON/OFF Control
GND
COUT1
22μF
R4
510kΩ
R1
1.02MΩ
FB
R3 510kΩ
COUT2
2.2μF
R2
576kΩ
Q2
2N3904
Figure 1: AAT1218 Application Schematic with Load Disconnect Circuit.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
11
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Evaluation Board Schematic
LX
VOUT
D1
B230LA
L1 2.2μH
VIN
U1
AAT1218-TDFN33-12
LX
1
2
C1
22μF
PGND
VIN
EN
R3
1M
PGND
3
4
5
6
LX
N/C
VIN
EN
N/C
GND
PGND
PGND
OUT
OUT
FB
GND
C2
22μF
12
11
C4
100pF
Opt.
10
9
8
7
VOUT
C3
22μF
R2
.
R1
FB 1.02M
576K VOUT = 3.3V
470K VOUT = 3.8V
324K VOUT = 5V
EXP PAD
JP2
3
2
1
PGND
ENABLE
GND
R10
0R
GND
GND
PGND
Figure 2: AAT1218 Evaluation Board Schematic.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Evaluation Board Layout
Figure 3: AAT1218 Evaluation Board
Top Side Layout.
Figure 4: AAT1218 Evaluation Board
Bottom Side Layout.
Designator
Description
Footprint
Comment
C1
C2
C3
C4
D1
JP2
L1
R1
R2
R3
R10
U1
Capacitor, Ceramic, Murata, GRM21BR60J226ME39, X5R, 22μF, ±20%, 6.3V
Capacitor, Ceramic, Murata, GRM21BR60J226ME39, X5R, 22μF, ±20%, 6.3V
Capacitor, Ceramic, Murata, GRM21BR60J226ME39, X5R, 22μF, ±20%, 6.3V
Capacitor, Ceramic, Murata, GRM1885C1H101JA01B, C0G, 100pF, ±5%, 50V
Schottky Diode, Vishay, B230LA
Header, 3-Pin
Inductor, Sumida
Chip Resistor, Panasonic, 1.02M, 1/16W, 1%
Chip Resistor, Panasonic, 590K, 1/16W, 1%
Chip Resistor, Panasonic, 1M, 1/16W, 5%
Chip Resistor, Panasonic, 0R, 1/16W, 5%
AAT1218-TDFN33-12, AnalogicTech
0805
0805
0805
0603
Diode
SMALLHDR1X3
CDRH4D28
0603
0603
0603
0603
TDFN33-12
22μF
22μF
22μF
100pF
2.2μH
1.02M
590K
1M
0R
Boost Reg.
Table 3: AAT1218 Evaluation Board Bill of Materials.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
13
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Ordering Information
Description
Package
Marking1
Part Number (Tape and Reel)2
Adjustable Output Voltage
Fixed 3.3V Output Voltage
Fixed 5V Output Voltage
TDFN33-12
TDFN33-12
TDFN33-12
2EXYY
5PXYY
5RXYY
AAT1218IWP-1.2-T1
AAT1218IWP-3.3-T1
AAT1218IWP-5.0-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
TDFN33-123
Index Area
0.40 ± 0.05
0.1 REF
C0.3
0.45 ± 0.05
2.40 ± 0.05
3.00 ± 0.05
Detail "A"
3.00 ± 0.05
1.70 ± 0.05
Top View
Bottom View
0.23 ± 0.05
Pin 1 Indicator
(optional)
0.05 ± 0.05
0.23 ± 0.05
0.75 ± 0.05
Detail "A"
Side View
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
14
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
DATA SHEET
AAT1218
High Current, 1.2MHz Synchronous Boost Converterr
Copyright © 2012, 2013 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
responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
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THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper
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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
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters.
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
identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202051B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
15