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PRODUCT DATASHEET
AAT1218
SwitchRegTM
General Description
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). 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. 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. 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 400A at no load. The device provides cycle-by-cycle current limit and overtemperature protection to prevent device over-stress. The AAT1218 is available in a Pb-free, 12-pin low profile TDFN33 package or a 12-pin TSOPJW package; both packages are rated from -40C to 85C.
1A, 1.2MHz Synchronous Boost Converter
Features
* * * * * * * * * 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 400A Standby Current <1A 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 or TSOPJW-12 Package
* *
* * * * * *
Applications
* * * * * * DVD Players Hard Disk Drive MP3 Players PDA Portable Computers Smart Phones
Typical Application
V IN: 3.6V L1 2.2H LX VIN EN C IN 22F 0805 GND PGND FB COUT 44F (2x22F) 0805 OUT V OUT: 5V @ 1A
AAT1218
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Pin Description
Pin #
TDFN33-12 1 2, 5 3 4 6, 7 8 9. 10 11, 12 5 3, 4 1, 2 TSOPJW-12 12 8, 11 10 9
1A, 1.2MHz Synchronous Boost Converter
Symbol
LX NC VIN EN GND FB 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. Power ground pin. Connect this pin directly to input and output capacitors. Output pin; connected to the positive terminal of the output capacitor and to the external resistor divider.
Pin Configuration
TDFN33-12 (Top View) TSOPJW-12 (Top View)
LX N/C VIN EN N/C GND
1 2 3 4 5 6
12 11 10 9 8 7
PGND PGND OUT OUT FB GND
PGND PGND OUT OUT FB GND
1 2 3 4 5 6
12 11 10 9 8 7
LX N/C VIN EN N/C GND
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
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)
1A, 1.2MHz Synchronous Boost Converter
Value
-0.3 to 6.0 -0.3 to 0.3 -40 to 150 300
Units
V V C C
Thermal Information
Symbol
PD JA
Description
Maximum Power Dissipation2 Maximum Thermal Resistance TDFN33-123 TSOPJW-124 TDFN33-12 TSOPJW-12
Value
2000 625 50 160
Units
mW mW C/W C/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. Mounted on 1.6mm thick FR4 circuit board. 3. Derate 25mW/C above 25C ambient temperature. 4. Derate 6.25mW/C above 25C ambient temperature.
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Electrical Characteristics
VIN = 1.2V, TA = 25C unless otherwise noted. Symbol
VIN VOUT_RANGE VFB
1A, 1.2MHz Synchronous Boost Converter
Description
Minimum Start-Up Voltage Minimum Start-Up Voltage Loaded Operating Input Voltage Range 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 Line Regulation Load Regulation Line Transient Response Load Transient Response Output Ripple
Conditions
ILOAD = 1mA ILOAD = 300mA (Resistive) TA = -40C to +85C VFB = 1.2V, TA = -40C to +85C 0.5 < VIN < VOUT - 0.5V, ILOAD = 0mA 0.5 < VIN < VOUT - 0.5V, VEN = 0
Min
Typ
0.85 1.4
Max
1 0.5 5.5 1.236 700 1 1.5 0
Units
V V V V V A A MHz % % A ms A A m m % %
2.5 1.164
1.200 300 0.01
IQ
FOSC DC ILIMIT TSS NMOS Leakage PMOS Leakage NMOS On-Resistance PMOS On-Resistance VOUT VOUT VOUT(LINE_TRANSIENT) VOUT(LOAD_TRANSIENT) VOUT(AC) EN VEN(L) VEN(H) IEN
0.95 80 2.0
1.2
TA = -40C to +85C VIN = 3.3V, VOUT = 5V, COUT = 10F
2.5 0.7 0.1 0.1 180 250 0.1 0.5
5.0 5.0
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, VIN = 1V, dVIN/dt = 0.2V/s, COUT = 22F ILOAD = 50mA to 500mA, dILOAD/dt = 0.5A/s, COUT = 22F VIN = 1.0 - (VOUT-0.5), ILOAD = 0mA to 1000mA, COUT = 22F, Measured Bandwidth = 20MHz
-3 -10
3 10 100
% VOUT % VOUT mVpp
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 1.0 1.4 -1.0
0.6
V V
1.0
A
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Typical Characteristics
VIN = 3.6V, VOUT = 3.6V, CIN = 22F, COUT = 44uF; L = 2.2H; TA = 25C, unless otherwise noted.
1A, 1.2MHz Synchronous Boost Converter
AAT1218 ISD vs. Temperature
1 0.8 390 385
AAT1218 IQ vs. Temperature
(VOUT = 5.5V, Measured From VOUT)
ISD (A)
0.6 0.4 0.2 0 -40
IQ_5.5V (A)
380 375 370 365 360 -40
-15
10
35
60
85
-15
10
35
60
85
Temperature (C)
Temperature (C)
AAT1218 VEN(L) vs. Temperature
0.50 0.48 1.25 1.23
AAT1218 VEN(H) vs. Temperature
(VOUT = 5V)
VEN(H) (V)
-15 10 35 60 85
VEN(L) (V)
0.46 0.44 0.42 0.40 -40
1.21 1.19 1.17 1.15 -40
-15
10
35
60
85
Temperature (C)
Temperature (C)
AAT1218 VFB vs. Temperature
1.236 1.227 1.218 10000
Maximum Load Current vs. VIN
Load Current (mA)
VFB (V)
1.209 1.200 1.191 1.182 1.173 1.164 -40 -15 10 35 60 85
1000
100
10
VOUT = 3.3V VOUT = 5V
0.85 1.35 1.85 2.35 2.85 3.35 3.85 4.35 4.85
Temperature (C)
Input Voltage (V)
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Typical Characteristics
VIN = 3.6V, VOUT = 3.6V, CIN = 22F, COUT = 44uF; L = 2.2H; TA = 25C, unless otherwise noted.
1A, 1.2MHz Synchronous Boost Converter
Maximum Load Current at Startup vs. VIN
10000 100 90 80
AAT1218 3.3V Output Efficiency
Load Current (mA)
Efficiency (%)
1000
70 60 50 40 30 20 10 0 0.1 1 10
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
VIN = 1.2V VIN = 1.5V VIN = 1.8V VIN = 2.4V
100 1000
Input Voltage (V)
ILOAD (mA)
AAT1218 5.0V Output Efficiency
100 90 80 100 90 80
AAT1218 5.0V Output Efficiency
Efficiency (%)
70 60 50 40 30 20 10 0 0.1 1 10 100
Efficiency (%)
70 60 50 40 30 20 10 0 0.1 1 10 100
VIN = 1.2V VIN = 1.5V VIN = 2.4V
1000
VIN = 3.0V VIN = 3.3V VIN = 3.6V VIN = 4.2V
1000 10000
ILOAD (mA)
ILOAD (mA)
Soft Start Waveform
(VIN = 1.5V; VOUT = 5V; Load = 100mA)
Anti-Ringing Operation
(VIN = 3V; VOUT = 5V; Load = 10mA)
LX (4V/div) VOUT (4V/div) IIN (0.5A/div) VEN (1V/div)
0
VOUT (AC Coupled) (20mV/div)
0
0
0 0
LX (2V/div)
0
Time (200s/div)
Time (0.2s/div)
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Typical Characteristics
VIN = 3.6V, VOUT = 3.6V, CIN = 22F, COUT = 44uF; L = 2.2H; TA = 25C, unless otherwise noted.
1A, 1.2MHz Synchronous Boost Converter
Power Saving Mode Waveform
(VIN = 3.6V; VOUT = 5V; Load = 5mA) IL (250mA/div) VIN (AC Coupled) (20mV/div) VOUT (AC Coupled) (20mV/div) LX (2V/div)
0
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
0 0
0
Time (4s/div)
Time (0.4s/div)
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Functional Block Diagram
Soft Start
1A, 1.2MHz Synchronous Boost Converter
VIN 1.4V-5.5V
VIN Slope Compensation LX
Vss
Start-Up Oscillator -
Start-Up Current Limit
MUX
VOUT GOOD - 2.3V OUT VOUT
+
L1
CIN
Current Sense To VIN Antiringing Control
COUT
R1
Bandgap 1.2V
+ +
FB Enable Logic EN EA - Shutdown Control - Comp
PWM Logic
R2
PGND
SHUTDOWN
Oscillator 1.2MHz
GND
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.
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.
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
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
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.
1A, 1.2MHz Synchronous Boost Converter
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:
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.
R1 VOUT = 1.20V * 1 + R2
VOUT
3.3V 5.0V
R1 ()
1.02M 1.02M
R2 ()
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.
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.
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 2.2H to 10H 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:
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.
VIN D=1- V OUT I IPEAK = IRMS + 2 VIN * D I = L * f SW
is the converter efficiency, IPEAK is the peak inductor current, I 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.
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 1A 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.
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Fit the proper L into the equations to meet the following criteria: 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 I 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. 1.
1A, 1.2MHz Synchronous Boost Converter
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 (Vtoatal) and solve for COUT from the equations below; assume that output current remains constant in steady state:
VTOTAL = V + VESR = V + IOUT * RESR V = IOUT * D COUT * FSW
A 10F to 47F 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.
Input Capacitor
Select a 4.7F to 10F 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 10F, 6.3V, X5R ceramic capacitor with 5.0V DC applied is actually about 6F.
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.
Manufacturer
Part Number
2D14
L (H)
2.2 3.3 4.7 2.2 3.3 5.0 2.2 3.5 4.7 2.0 3.3 5.1
Max DCR (m)
94 125 169 23.4 28.6 44.2 44.3 65.1 82.6 57 96 140
Rated DC Current (A)
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
CR54 Sumida CDRH4D22/HP
5.6x6.1x4.85
5.0x5.0x2.4
CDRH5D14/HP
6.0x6.3x1.5
Table 2: AAT1218 Typical Surface Mount Inductors.
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
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.
1A, 1.2MHz Synchronous Boost Converter
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.
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 2.2H
D1(Optional)
LX VIN 1.2V VIN VOUT
Q1 Si2305DS R4 510k FB R1 1.02M R2 576k
VOUT 3.3V, 300mA
CIN 10F
AAT1218
EN PGND GND
COUT 2x22F
R3 510k ON/OFF Control
Q2 2N3904
Figure 1: AAT1218 Application Schematic with Load Disconnect Circuit.
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Evaluation Board Schematic
LX VOUT D1 B230LA L1 2.2H VIN C1 22F PGND JP2
3 2 1
1A, 1.2MHz Synchronous Boost Converter
PGND
VOUT
LX VIN EN
U1 AAT1218-TDFN33-12
1 2 3 4 5 6
C3 22F C2 22F C4 100pF Opt. R2 576K VOUT = 3.3V 470K VOUT = 3.8V 324K VOUT = 5V
R3 1M
LX N/C VIN EN N/C GND
PGND PGND OUT OUT FB GND EXP PAD
12 11 10 9 8 7
. R1 FB 1.02M
PGND R10 0R
ENABLE GND
GND GND PGND
Figure 2: AAT1218 Evaluation Board Schematic.
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Evaluation Board Layout
1A, 1.2MHz Synchronous Boost Converter
Figure 3: AAT1218 Evaluation Board Top Side Layout. Designator
C1 C2 C3 C4 D1 JP2 L1 R1 R2 R3 R10 U1
Figure 4: AAT1218 Evaluation Board Bottom Side Layout. Footprint
0805 0805 0805 0603 Diode SMALLHDR1X3 CDRH4D28 0603 0603 0603 0603 TDFN33-12
Description
Capacitor, Ceramic, Murata, GRM21BR60J226ME39, X5R, 22F, 20%, 6.3V Capacitor, Ceramic, Murata, GRM21BR60J226ME39, X5R, 22F, 20%, 6.3V Capacitor, Ceramic, Murata, GRM21BR60J226ME39, X5R, 22F, 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
Comment
22F 22F 22F 100pF
2.2H 1.02M 590K 1M 0R Boost Reg.
Table 3: AAT1218 Evaluation Board Bill of Materials.
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PRODUCT DATASHEET
AAT1218
SwitchRegTM
Ordering Information
Description
Adjustable Output Voltage Fixed 3.3V Output Voltage Fixed 5V Output Voltage Adjustable Output Voltage Fixed 3.3V Output Voltage Fixed 5V Output Voltage
1A, 1.2MHz Synchronous Boost Converter
Package
TSOPJW-12 TSOPJW-12 TSOPJW-12 TDFN33-12 TDFN33-12 TDFN33-12
Marking1
2FXYY 7JXYY 7KXYY 2EXYY 5PXYY 5RXYY
Part Number (Tape and Reel)2
AAT1218ITP-1.2-T1 AAT1218ITP-3.3-T1 AAT1218ITP-5.0-T1 AAT1218IWP-1.2-T1 AAT1218IWP-3.3-T1 AAT1218IWP-5.0-T1
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/about/quality.aspx.
Package Information
TDFN33-123
Index Area Detail "A" 0.43 0.05
3.00 0.05
2.40 0.05
0.1 REF C0.3 0.45 0.05
Pin 1 Indicator (optional)
3.00 0.05
1.70 0.05
Top View
Bottom View Detail "A"
0.75 0.05
0.05 0.05
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.
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0.23 0.05
0.23 0.05
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PRODUCT DATASHEET
AAT1218
SwitchRegTM 1A, 1.2MHz Synchronous Boost Converter
TSOPJW-12
0.20 + 0.10 - 0.05
2.40 0.10
0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC
2.85 0.20
7 NOM 3.00 0.10
0.9625 0.0375 + 0.10 1.00 - 0.065
0.04 REF
0.055 0.045
4 4
0.010
0.15 0.05
0.45 0.15 2.75 0.25
All dimensions in millimeters.
Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611
(c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
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Price & Availability of AAT1218ITP-12-T1

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