SwitchRegAAT1162 800kHz high efficiency step-down DC/DC converter. Wit

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SwitchRegAAT1162 800kHz high efficiency step-down DC/DC converter. Wit

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AAT1162
SwitchRegAAT1162 800kHz high efficiency step-down DC/DC converter. With wide input voltage range 4.0V 13.2V, AAT1162 ideal choice dualcell Lithium-ion battery-powered devices mid-power-range regulated 12V-powered industrial applications. internal power switches capable delivering 1.5A load. AAT1162 highly integrated device, simplifying system-level design. Minimum external components required converter. AAT1162 optimizes efficiency throughout entire load range. operates combination PWM/Light Load mode improved light-load efficiency. high switching frequency allows small external components. current shutdown feature disconnects load from drops shutdown current less than AAT1162 available Pb-free, space-saving, thermally-enhanced 16-pin TDFN34 packageand rated over operating temperature range -40°C +85°C.
12V, 1.5A Step-Down DC/DC Converter
Features
Input Voltage Range: 4.0V 13.2V 1.5A Load Current Fixed Adjustable Output: Output Voltage: 0.6V 115A No-Load Operating Current Less than Shutdown Current Efficiency Integrated Power Switches 800kHz Switching Frequency Soft Start Function Short-Circuit Over-Temperature Protection Minimum External Components TDFN34-16 Package Temperature Range: -40°C +85°C
Applications
Distributed Power Systems Industrial Applications Laptop Computers Portable Players Portable Media Players Set-Top Boxes Monitors HDTVs
Typical Application
Input: 4.0V 13.2V 0.1F DGND COMP 330pF PGND AGND 4.7H Output: 0.6V min, 1.5A
AAT1162
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AAT1162
SwitchRegDescriptions
12V, 1.5A Step-Down DC/DC Converter
Symbol
Function
Power switching node. drain internal P-channel switch N-channel synchronous rectifier. Connect output inductor pins EP2. large exposed copper under package should used EP2. connected. Power source input. Connect input power source. Bypass DGND with greater capacitor. Connect both pins together close possible. additional 100nF ceramic capacitor should also connected between pins DGND, Exposed Digital Ground, DGND. exposed thermal (EP1) should connected board ground plane pins ground plane should include large exposed copper under package thermal dissipation (see package outline). Internal analog bias input. supplies internal power AAT1162. Connect input source voltage bypass AGND with 0.1F greater capacitor. additional noise rejection, connect input power source through lower value resistor. Internal bypass node. output voltage internal bypassed LDO. internal circuitry AAT1162 powered from LDO. draw external power from LDO. Bypass AGND with greater capacitor. Output voltage feedback input. senses output voltage regulation control. fixed output versions, connect output voltage. adjustable versions, drive from output voltage through resistive voltage divider. regulation threshold 0.6V. Control compensation node. Connect series network from COMP AGND, 150pF. Analog signal ground. Connect AGND PGND single point close possible. Active high enable input. Drive high turn AAT1162; drive turn off. automatic startup, connect through 4.7k resistor. must biased high, biased low, driven logic level external source. float when device powered. Power ground. Connect AGND PGND single point close possible.
DGND
COMP AGND PGND
Configuration
TDFN34-16 (Top View)
DGND
PGND DGND DGND AGND COMP
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AAT1162
SwitchRegAbsolute Maximum Ratings1
Symbol
VIN, VAIN
12V, 1.5A Step-Down DC/DC Converter
Description
Input Voltage Voltage Voltage Voltage Operating Junction Temperature Range
Value
-0.3 -0.3 -0.3 -0.3
Units
Thermal Information3
Symbol
Description
Maximum Power Dissipation4 Thermal Resistance
Value
Units
°C/W
Stresses above those listed Absolute Maximum Ratings cause permanent damage device. Functional operation conditions other than operating conditions specified implied. Only Absolute Maximum Rating should applied time. Based long-term current density limitation. Mounted board. Derate 2.7mW/°C above 25°C.
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AAT1162
SwitchRegElectrical Characteristics1
4.0V 13.2V. COUT 22F; 3.8H, -40°C +85°C, unless otherwise noted. Typical values 25°C. Symbol
VUVLO ISHDN VOUT VOUT VOUT/ VOUT/VIN VOUT/ IOUT IFBLEAK FOSC RDS(ON)H RDS(ON)L ILIM ILXLEAK THYS
12V, 1.5A Step-Down DC/DC Converter
Description
Input Voltage Range Input Under-Voltage Lockout Supply Current Shutdown Current Output Voltage Range Output Voltage Accuracy Line Regulation Load Regulation Feedback Reference Voltage (adjustable version) Leakage Current Oscillator Frequency Foldback Frequency Maximum Duty Cycle Minimum Turn-On Time Soft-Start Time P-Channel Resistance N-Channel Resistance Efficiency PMOS Current Limit Leakage Current Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Logic Input Threshold Logic High Input Threshold Input Current
Conditions
Rising Hysteresis Load
13.2
Units
IOUT 1.5A 4.5V 13.2V 12V, VOUT IOUT 1.5A Load, 25°C Adjustable Version VOUT 1.2V Fixed Version
-2.5 0.023 0.59 0.60 0.12 0.15 0.06 0.08
0.94 0.100
0.61
12V, VOUT IOUT 1.5A
13.2V,
13.2V -1.0
AAT1162 guaranteed meet performance specifications over -40°C +85°C operating temperature range assured design, characterization, correlation with statistical process controls.
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AAT1162
SwitchRegTypical Characteristics
Test circuit Figure unless otherwise specified.
12V, 1.5A Step-Down DC/DC Converter
Efficiency Output Current
(VOUT
Load Regulation
(VOUT Output Voltage Difference
-0.1 -0.2 -0.3 -0.4 -0.5 0.0001 0.001 0.01
Efficiency
0.0001 0.001 0.01
8.4V 13.2V
8.4V 13.2V
Output Current
Output Current
Efficiency Output Current
(VOUT 3.3V)
Load Regulation
(VOUT 3.3V)
Output Voltage Error
0.0001 0.001 0.01
-0.2 -0.4 -0.6 1000
Efficiency
8.4V 13.2V
8.4V 13.2V
10000
Output Current
Output Current
Line Regulation
(VOUT Output Voltage Difference
-0.1 -0.2 -0.3 -0.4
Line Regulation
(VOUT 3.3V) Output Voltage Difference
0.05 0.04 0.03 0.02 0.01 -0.01 -0.02 -0.03 -0.04
1.5A 10mA 100mA
1.5A 10mA 100mA
Input Voltage
Input Voltage
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AAT1162
SwitchRegTypical Characteristics
Test circuit Figure unless otherwise specified.
12V, 1.5A Step-Down DC/DC Converter
Supply Current Input Voltage
(VOUT
Switching Current Temperature
(VOUT
Quiescent Current (µA)
Time (ns)
85°C 25°C -40°C
Input Voltage
Temperature (°C)
N-Channel RDS(ON) Temperature
P-Channel RDS(ON) Temperature
(VIN
Resistance
Resistance
Temperature (°C)
Temperature (°C)
Switching Frequency Temperature
Switching Frequency (Hz)
Start-up Time
(VOUT 5.0V; 100pF; RLOAD 1.5A; 10µF; COUT 22µF; 3.8µH) Input Current (bottom) Enable Voltage (top)
VOUT
LOAD
Temperature (°C)
Time (500µs/div)
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AAT1162
SwitchRegTypical Characteristics
Test circuit Figure unless otherwise specified.
12V, 1.5A Step-Down DC/DC Converter
Line Transient
(VOUT 5.0V; 100pF; 7.6V 11V; IOUT 1.5A; 10µF; COUT 22µF; 3.8µH)
5.30 5.25 5.20 5.15 5.10 5.05 5.00 4.95 4.90
Load Transient
(VOUT 3.3V; 100pF; COUT 66µF) Output Voltage (bottom) Load Inductor Current (bottom) (1A/div) Output Voltage (top)
10mA 1.5A
Input Voltage (top)
Time (100µs/div)
Time (50µs/div)
Load Transient
(VOUT 3.3V; COUT 66µF; CFF)
Load Transient
(VOUT 100pF; COUT 66µF) Load Inductor Current (bottom) (1A/div) Load Inductor Current (bottom) (1A/div) Output Voltage (top)
10mA 1.5A
Output Voltage (top)
10mA 1.5A
Time (50µs/div)
Time (50µs/div)
Load Transient
(VOUT COUT 66µF; CFF)
VOUT Temperature
(VOUT 3.3V; ILOAD 1.5A) Output Voltage Difference
-0.2 -0.4 -0.6 -0.8
Load Inductor Current (bottom) (1A/div)
Output Voltage (top)
10mA 1.5A
Time (50µs/div)
Temperature (°C)
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AAT1162
SwitchRegTypical Characteristics
Test circuit Figure unless otherwise specified.
12V, 1.5A Step-Down DC/DC Converter
Load Transient
(VOUT 3.3V; 100pF; COUT 22µF)
Load Transient
(VOUT 3.3V; COUT 22µF; CFF) Load Inductor Current (bottom) (1A/div) Load Inductor Current (bottom) (1A/div) Output Voltage (top)
10mA 1.5A
Output Voltage (top)
10mA 1.5A
Time (50µs/div)
Time (50µs/div)
Load Transient
(VOUT 100pF; COUT 22µF)
Load Transient
(VOUT COUT 22µF; CFF) Load Inductor Current (bottom) (1A/div) Load Inductor Current (bottom) (1A/div) Output Voltage (top)
10mA 1.5A
Output Voltage (top)
10mA 1.5A
Time (50µs/div)
Time (50µs/div)
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AAT1162
SwitchRegFunctional Block Diagram
Note Current Sense Error Current Mode Comparator Control Logic
12V, 1.5A Step-Down DC/DC Converter
Reference
PGND AGND
DGND
COMP Note fixed output voltage versions, connected error amplifier through resistive voltage divider shown.
Functional Description
AAT1162 current-mode step-down DC/DC converter that operates over wide 13.2V input voltage range capable supplying 1.5A load with output voltage regulated 0.6V. Both P-channel power switch N-channel synchronous rectifier internal, reducing number external components required. output voltage adjusted external resistor divider; fixed output voltage versions available upon request. regulation system externally compensated, allowing circuit optimized each application. AAT1162 includes cycle-by-cycle current limiting, frequency fold-
back improved short-circuit performance, thermal overload protection prevent damage event external fault condition.
Control Loop
AAT1162 regulates output voltage using constant frequency current mode control. AAT1162 monitors current through high-side P-channel MOSFET uses that signal regulate output voltage. This provides improved transient response eases compensation. Internal slope compensation included ensure current "inside loop" stability.
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AAT1162
SwitchRegHigh efficiency maintained under light load conditions automatically switching variable frequency Light Load control. this condition, transition losses reduced operating lower frequency light loads.
12V, 1.5A Step-Down DC/DC Converter
Applications Information
Setting Output Voltage
Figure shows basic application circuit AAT1162 output setting resistors. Resistors program output regulate voltage higher than 0.6V. limit bias current required external feedback resistor string while maintaining good noise immunity, minimum suggested value 5.9k. Although larger value will further reduce quiescent current, will also increase impedance feedback node, making more sensitive external noise interference. Table summarizes resistor values various output voltages with either 5.9k good noise immunity reduced load input current.
4.5V- 13.2V DGND DGND PGND 3.8H 100pF VOUT 1.5A 432k
Short-Circuit Protection
AAT1162 uses cycle-by-cycle current limit protect itself load from external fault condition. When inductor current reaches internally 3.0A current limit, P-channel MOSFET switch turns N-channel synchronous rectifier turned limiting inductor load current. During overload condition, when output voltage drops below regulation voltage (0.3V FB), AAT1162 switching frequency drops factor This gives inductor current ample time reset during time prevent inductor current from rising uncontrolled short-circuit condition.
Thermal Protection
AAT1162 includes thermal protection that disables regulator when temperature reaches automatically restarts when temperature decreases more.
AAT1162
COMP AGND DGND DGND
330pF
Figure Typical Application Circuit. adjustable feedback resistors, combined with external feed forward capacitor Figure deliver enhanced transient response extreme pulsed load applications. addition feed forward capacitor typically requires larger output capacitor stability. Larger values reduce overshoot undershoot during startup load changes. However, exceed 470pF maintain stable operation.
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AAT1162
SwitchRegexternal resistors output voltage according following equation:
12V, 1.5A Step-Down DC/DC Converter
Where inductor ripple current. Large value inductors lower ripple current small value inductors result high ripple currents. Choose inductor ripple current approximately maximum load current 1.5A, 480mA. output voltages above 3.3V, minimum recommended inductor 3.8H. 3.3V below, 3.8H inductor. optimum voltagepositioning load transients, choose inductor with series resistance range. higher efficiency heavy loads (above 1A), minimal load regulation (but some transient overshoot), resistance should kept below 18m. current rating inductor should least equal maximum load current plus half ripple current prevent core saturation (1.5A 280mA). Table lists some typical surface mount inductors that meet target applications AAT1162. Manufacturer's specifications list both inductor current rating, which thermal limitation, peak current rating, which determined saturation characteristics. inductor should show appreciable saturation under normal load conditions. Some inductors meet peak average current ratings result excessive losses high DCR. Always consider losses associated with effect total converter efficiency when selecting inductor. example, 4.7H WE-TPC series inductor selected from Wurth 2.4ADC current rating. full load, inductor loss 85mW which gives only 1.1% loss efficiency 1.5A, output.
VOUT 0.6V
VOUT
Table shows resistor selection different output voltage settings. 5.9(k)
1.96 2.94 3.92 4.99 5.90 6.81 7.87 8.87 11.8 12.4 13.7 18.7 26.7 43.2
VOUT
1.85
59(k)
19.6 29.4 39.2 49.9 59.0 68.1 78.7 88.7
Table Resistor Selection Different Output Voltage Settings. Standard Resistors Substituted Calculated Values.
Input Capacitor Selection
input capacitor reduces surge current drawn from input switching noise from device. input capacitor impedance switching frequency shall less than input source impedance prevent high frequency switching current passing input. input capacitor sized maximum current must used. Ceramic capacitors with dielectrics highly recommended because their small temperature coefficients. ceramic capacitor sufficient most applications.
Inductor Selection
most designs, AAT1162 operates with inductors 4.7H. inductance values physically smaller, require faster switching, which results some efficiency loss. inductor value derived from following equation:
VOUT 3.8µH
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AAT1162
SwitchRegManufacturer
Sumida Sumida Coilcraft Cooper Bussman Wurth
12V, 1.5A Step-Down DC/DC Converter
Part Number
CDRH103RNP-2R2N CDR7D43MNNP-3R7NC MSS1038-382NL DR73-4R7-R 7440530047
16.9 18.9 29.7
Rated Current
5.10 4.25 3.09 2.40
Size WxLxH (mm)
10.3x10.5x3.1 7.6x7.6x4.5 10.2x7.7x3.8 6.0x7.6x3.55 5.8x5.8x2.8
Table Typical Surface Mount Inductors. estimate required input capacitor size, determine acceptable input ripple level (VPP) solve calculated value varies with input voltage maximum when double output voltage.
IRMS(MAX)
FOSC
FOSC
CIN(MIN)
Always examine ceramic capacitor voltage coefficient characteristics when selecting proper value. example, capacitance 10F, 16V, ceramic capacitor with applied actually about 8.5F. maximum input capacitor current
term appears both input voltage ripple input capacitor current equations maximum when twice VIN. This input voltage ripple input capacitor current ripple maximum duty cycle. input capacitor provides impedance loop edges pulsed current drawn AAT1162. ESR/ESL ceramic capacitors ideal this function. minimize stray inductance, capacitor should placed closely possible This keeps high frequency content input current localized, minimizing input voltage ripple. proper placement input capacitor (C6) seen evaluation board layout Figure Additional noise filtering proper operation accomplished adding small 0.1F capacitor pins (C2).
IRMS
input capacitor ripple current varies with input output voltage will always less than equal half total load current:
0.52
laboratory test set-up typically consists long wires running from bench power supply evaluation board input voltage pins. inductance these wires, along with low-ESR ceramic input capacitor, create high network that affect converter performance. This problem often becomes apparent form excessive ringing output voltage during load transients. Errors loop phase gain measurements also result. Since inductance short trace feeding input voltage significantly lower than power leads from bench power supply, most applications exhibit this problem. applications where input power source lead inductance cannot reduced level that does affect converter performance, high tantalum aluminum electrolytic should placed parallel with ESR, bypass ceramic. This dampens high network stabilizes system.
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AAT1162
SwitchRegOutput Capacitor Selection
output capacitor required keep output voltage ripple small ensure regulation loop stability. output capacitor must have impedance switching frequency. Ceramic capacitors with dielectrics recommended their high ripple current. output ripple VOUT determined
12V, 1.5A Step-Down DC/DC Converter
maximum output capacitor ripple current given
IRMS(MAX)
VOUT (VIN(MAX) VOUT) FOSC VIN(MAX)
Dissipation current ceramic output capacitor typically minimal, resulting less than degrees rise hot-spot temperature.
VOUT
VOUT (VIN VOUT) FOSC FOSC COUT
Compensation
AAT1162 step-down converter uses peak current mode control with slope compensation scheme maintain stability with lower value inductors duty cycles greater than 50%. regulation feedback loop stabilized components connected COMP pin, shown Figure optimize compensation components, following equations used. compensation resistor RCOMP (R5) calculated using following equation:
output capacitor limits output ripple provides holdup during large load transitions. ceramic capacitor typically provides sufficient bulk capacitance stabilize output during large load transitions characteristics necessary output ripple. output voltage droop load transient dominated capacitance ceramic output capacitor. During step increase load current, ceramic output capacitor alone supplies load current until loop responds. Within three switching cycles, loop responds inductor current increases match load current demand. relationship output voltage droop during three switching cycles output capacitance estimated
RCOMP (R5)=
2VOUT COUT FOSC 10GEA GCOMP
Where 0.6V, GCOMP 40.1734 9.091 10-5. FOSC switching frequency COUT based output capacitor calculation. CCOMP value determined from following equation:
COUT
ILOAD VDROOP FOSC
Once average inductor current increases load level, output voltage recovers. above equation establishes limit minimum value output capacitor with respect load transients. internal voltage loop compensation also limits minimum output capacitor value 22F. This effect loop crossover frequency (bandwidth), phase margin, gain margin. Increased output capacitance will reduce crossover frequency with greater phase margin.
CCOMP (C7)
2RCOMP (R5) FOSC
feed forward capacitor (C1) provides faster transient response pulsed load applications. addition feed forward capacitor typically requires larger output capacitor stability. Larger values reduce overshoot undershoot during startup line/load changes. value from 100pF 470pF, exceed 470pF maintain stable operation.
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AAT1162
SwitchRegLayout Guidance
Figure schematic evaluation board. When laying board, following layout guideline should followed ensure proper operation AAT1162: Exposed must reliably soldered PGND/ DGND/AGND. exposed thermal should connected board ground plane pins ground plane should include large exposed copper under package thermal dissipation. power traces, including traces, traces trace should kept short, direct wide allow large current flow. connection pins should short possible. several pads when routing between layers. Exposed must reliably soldered pins exposed thermal should connected board connection inductor also pins plane should include large exposed copper under package thermal dissipation.
12V, 1.5A Step-Down DC/DC Converter
input capacitors should connected close possible (Pins DGND (Pin good power filtering. Keep switching node away from sensitive node. feedback trace should separate from power trace connected closely possible load point. Sensing along highcurrent load trace will degrade load regulation. feedback resistors should placed close possible (Pin minimize length high impedance feedback trace. output capacitors should connected close possible there should signal lines under inductor. resistance trace from load return PGND (Pin should kept minimum. This will help minimize error regulation differences potential internal signal ground power ground.
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AAT1162
SwitchRegEnable
12V, 1.5A Step-Down DC/DC Converter
TP14
4.75K
4.75K 330pF TP11 DGND *Note: Connect GND, DGND, AGND 3.8H 100pF 432K VOUT VOUT VOUT VOUT TP12 Enable
TP13
0.1F
AAT1162 COMP AGND DGND
DGND DGND PGND
Figure AAT1162 Evaluation Board Schematic.
Figure AAT1162 Evaluation Board Component Side Layout.
Figure AAT1162 Evaluation Board Solder Side Layout.
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AAT1162
SwitchRegDesign Example
Specifications
VOUT FOSC TAMB 1.5A, Pulsed Load ILOAD 1.5A nominal 800kHz 85°C TDFN34-16 Package
12V, 1.5A Step-Down DC/DC Converter
Output Inductor
VOUT 3.8µH 5.75µH; 4.7µH (see Table
0.32 ILOAD 480mA
Cooper Bussman inductor DR73-4R7-R 4.7H 29.7mW max.
VOUT 480mA FOSC 4.7µH 800kHz
IPK1 ILOAD
1.5A 0.480A 1.98A
ILOAD2 117mW
Output Capacitor
VDROOP 0.2V
COUT
ILOAD 1.5A 28µF; 22µF 0.2V 800kHz VDROOP FOSC (VOUT) (VIN(MAX) VOUT) (12V 139mArms FOSC VIN(MAX) 4.7µH 800kHz
IRMS(MAX)
Pesr IRMS2 (277mA)2 384µW
Input Capacitor
Input Ripple 50mV
11µF; 10µF 50mV 800kHz FOSC ILOAD 1.5A
ILOAD 0.75Arms
IRMS(MAX)
IRMS2 (0.75A)2 2.81mW
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AAT1162
SwitchRegAAT1162 Losses
Total losses estimated calculating dropout (VIN losses where power MOSFET RDS(ON) will maximum value. values assume 85°C ambient temperature 140°C junction temperature with TDFN 37°C/W package.
12V, 1.5A Step-Down DC/DC Converter
PLOSS ILOAD2 RDS(ON)H 1.5A2 0.158 0.355W TJ(MAX) TAMB PLOSS 85°C (37°C/W) 355mW 96.6°C
total losses also investigated nominal input voltage (12V). simplified version RDS(ON) losses assumes that N-channel P-channel RDS(ON) equal.
PTOTAL ILOAD2 RDS(ON) [(tsw FOSC ILOAD VIN]
1.5A2 100m [(5ns 800kHz 1.5A 150µA) 12V] 299mW
TJ(MAX) TAMB PLOSS 85°C (37°C/W) 299mW 96°C
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AAT1162
SwitchRegOrdering Information
Package
TDFN34-16
12V, 1.5A Step-Down DC/DC Converter
Marking1
YYXYY
Part Number (Tape Reel)2
AAT1162IRN-0.6-T1
AnalogicTech products offered Pb-free packaging. term "Pb-free" means semiconductor products that compliance with current RoHS standards, including requirement that lead exceed 0.1% weight homogeneous materials. more information, please visit website
Package Information
TDFN34-16
3.000 0.050 0.070 0.050 1.600 0.050
Index Area
4.000 0.050
2.350 0.050
0.230 0.050
0.25 1.600 0.050
0.430 0.050
View
Bottom View
0.750 0.050
0.050 0.050
0.230 0.050
Side View
dimensions millimeters.
assembly date code. Sample stock generally held part numbers listed BOLD.
Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, 95054 Phone (408) 737-4600 (408) 737-4611
Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility circuitry other than circuitry entirely embodied AnalogicTech product. circuit patent licenses, copyrights, mask work rights, other intellectual property rights implied. AnalogicTech reserves right make changes their products specifications discontinue product service without notice. Except provided AnalogicTech's terms conditions sale, AnalogicTech assumes liability whatsoever, AnalogicTech disclaims express implied warranty relating sale and/or AnalogicTech products including liability warranties relating fitness particular purpose, merchantability, infringement patent, copyright other intellectual property right. order minimize risks associated with customer's applications, adequate design operating safeguards must provided customer minimize inherent procedural hazards. Testing other quality control techniques utilized extent AnalogicTech deems necessary support this warranty. Specific testing parameters each device necessarily performed. AnalogicTech AnalogicTech logo trademarks Advanced Analogic Technologies Incorporated. other brand product names appearing this document registered trademarks trademarks their respective holders.
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0.450 0.050
0.35
1162.2008.01.1.3

SwitchRegAAT1162 800kHz high efficiency step-down DC/DC converter. Wit

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