SwitchRegAAT1140 SwitchReg 1.4MHz step-down converter with input volta
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AAT1140
SwitchRegAAT1140 SwitchReg 1.4MHz step-down converter with input voltage range 2.7V 5.5V output voltage 0.6V. optimized react quickly load variation. AAT1140 available fixed voltage versions with internal feedback programmable version with external feedback resistors. deliver 600mA load current while maintaining load quiescent current. 1.4MHz switching frequency minimizes size external components while keeping switching losses low. AAT1140 designed maintain high efficiency throughout operating range, which critical portable applications. AAT1140 available Pb-free SOT23-5 package rated over -40°C +85°C temperature range.
Fast Transient 600mA Step-Down Converter
Features
Range: 2.7V 5.5V VOUT Fixed Adjustable from 0.6V Load Quiescent Current Efficiency 600mA Output Current 1.4MHz Switching Frequency 120s Soft Start Fast Load Transient Over-Temperature Protection Current Limit Protection 100% Duty Cycle Low-Dropout Operation Shutdown Current SOT23-5 Package Temperature Range: -40°C +85°C
Applications
Cellular Phones Digital Cameras Handheld Instruments Microprocessor Core Power PDAs Handheld Computers Devices
Typical Application (Fixed Output Voltage)
AAT1140 4.7µF
4.7µH
VOUT
4.7µF
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AAT1140
SwitchRegDescriptions
Fast Transient 600mA Step-Down Converter
Symbol
Function
Enable pin. Ground pin. Connect output input capacitor return. Switching node. Connect inductor this pin. internally connected drains both high- low-side MOSFETs. Input supply voltage converter. Feedback input pin. This connected either directly converter output external resistive divider adjustable output.
Configuration
SOT23-5 (Top View)
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AAT1140
SwitchRegAbsolute Maximum Ratings1
Symbol
VOUT TLEAD
Fast Transient 600mA Step-Down Converter
Description
Input Voltage Operating Junction Temperature Range Storage Temperature Range Maximum Soldering Temperature leads, sec)
Value
-0.3 -0.3 -0.3
Units
Thermal Information
Symbol
Description
Maximum Power Dissipation2, Thermal Resistance2
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. Mounted board. Derate 6.67mW/°C above 25°C.
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AAT1140
SwitchRegElectrical Characteristics1
-40°C +85°C, unless otherwise noted. Typical values 25°C, 3.6V. Symbol
VUVLO VOUT VOUT ISHDN ILIM RDS(ON)H RDS(ON)L ILXLEAK VLinereg VOUT IOUT ROUT FOSC THYS VEN(L) VEN(H)
Fast Transient 600mA Step-Down Converter
Description
Input Voltage UVLO Threshold Output Voltage Tolerance Output Voltage Range Quiescent Current Shutdown Current P-Channel Current Limit High Side Switch Resistance Side Switch Resistance Leakage Current Line Regulation Threshold Voltage Accuracy Leakage Current Impedance Start-Up Time Oscillator Frequency Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Enable Threshold Enable Threshold High Input Current
Conditions
Units
Step-Down Converter Rising Hysteresis Falling IOUT 600mA, 2.7V 5.5V Load, 0.6V Adjustable Version AGND PGND 0.53 0.40 5.5V, VIN, 2.7V 5.5V 0.6V Output, Load, 25°C 0.6V Output >0.6V Output From Enable Output Regulation 25°C
-3.5 +3.5
VOUT 5.5V -1.0
AAT1140 guaranteed meet performance specifications over -40°C +85°C operating temperature range assured design, characterization, correlation with statistical process controls.
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AAT1140
SwitchRegTypical Characteristics
Efficiency Load
(VOUT 3.3V; 6.8H)
Fast Transient 600mA Step-Down Converter
Regulation
(VOUT 3.3V; 6.8µH)
-1.0 -2.0 -3.0
3.6V 4.2V 5.0V Output Error
Efficiency
4.2V
5.0V
5.5V
1000
Output Current (mA)
Output Current (mA)
Efficiency Load
(VOUT 2.5V; 6.8H)
Regulation
(VOUT 2.5V; 6.8µH)
-1.0 -2.0 -3.0
2.7V Output Error 5.0V 4.2V 3.6V
Efficiency
5.0V
3.0V
3.6V
4.2V
1000
Output Current (mA)
Output Current (mA)
Efficiency Load
(VOUT 1.8V; 4.7H)
Regulation
(VOUT 1.8V; 4.7H)
2.7V Output Error 3.6V 4.2V
-1.0 -2.0 -3.0
Efficiency
2.7V
3.6V
4.2V
1000
Output Current (mA)
Output Current (mA)
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AAT1140
SwitchRegTypical Characteristics
(VIN 3.6V; VOUT 1.8V; Load Enable Output Voltage (top)
0.40 0.30
Fast Transient 600mA Step-Down Converter
Soft Start
Line Regulation
(VOUT 1.8V)
VOUT
Accuracy
0.20 0.10 0.00 -0.10 -0.20 -0.30 -0.40
IOUT 10mA
Inductor Current (bottom)
IOUT
IOUT 400mA
Time (100s/div)
Input Voltage
Output Voltage Error Temperature
(VIN 3.6V; 1.8V; IOUT 400mA)
15.0 12.0
Switching Frequency Temperature
(VIN 3.6V; VOUT 1.8V)
Output Error
Variation
-3.0 -6.0 -9.0 -12.0 -15.0
-1.0
-2.0
Temperature (°C)
Temperature (°C)
Frequency Input Voltage
Load Quiescent Current Input Voltage
(VOUT 3.0V, 6.8µH)
Frequency Variation
Supply Current (µA)
-1.0 -2.0 -3.0 -4.0
VOUT 1.8V
85°C 25°C
VOUT 2.5V
VOUT 3.3V
-40°C
Input Voltage
Input Voltage
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1140.2007.12.1.1
AAT1140
SwitchRegTypical Characteristics
Load Quiescent Current Input Voltage
(VOUT 1.8V, 4.7µH)
0.060 0.060 0.055 0.050 0.045 0.040 0.035 0.030 0.025 0.020
Fast Transient 600mA Step-Down Converter
Load Quiescent Current Input Voltage
(VOUT 1.2V, 2.2µH)
0.055 0.050 0.045 0.040 0.035 0.030 0.025 0.020
Supply Current (µA)
Supply Current (µA)
85°C 25°C
25°C
85°C
-40°C
-40°C
Input Voltage
Input Voltage
P-Channel RDS(ON) Input Voltage
N-Channel RDS(ON) Input Voltage
85°C RDS(ON)
85°C
RDS(ON)
-40°C
25°C
-40°C
25°C
Input Voltage
Input Voltage
Load Transient Response
(1mA 300mA; 3.6V; VOUT 1.8V; 10F; 100pF)
1.90 1.85 1.80 1.75
Load Transient Response
(300mA 400mA; 3.6V; VOUT 1.8V; 4.7F) Load Inductor Current (200mA/div) (bottom) Load Inductor Current (200mA/div) (bottom)
400mA 300mA
Output Voltage (top)
300mA
Output Voltage (top)
Time (50s/div)
Time (50s/div)
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AAT1140
SwitchRegTypical Characteristics
Load Transient Response
(300mA 400mA; 3.6V; VOUT 1.8V; 10F)
1.90 1.85 1.80 1.75
Fast Transient 600mA Step-Down Converter
Load Transient Response
(300mA 400mA; 3.6V; VOUT 1.8V; 10µF; 100pF)
1.850 1.825 1.800 1.775
Load Inductor Current (200mA/div) (bottom)
Load Inductor Current (200mA/div) (bottom)
400mA 300mA
Output Voltage (top)
Output Voltage (top)
400mA 300mA
Time (50s/div)
Time (50µs/div)
Line Response
(VOUT 1.8V 400mA) Output Voltage coupled) (top) (mV)
1.82 1.81 -100 -120
Output Ripple
(VIN 3.6V; VOUT 1.8V; IOUT 1mA)
0.30
0.25
Inductor Current (bottom)
Output Voltage (top)
0.20 0.15 0.10
Input Voltage (bottom)
1.80 1.79 1.78 1.77 1.76
0.05 0.00 -0.05 -0.10
Time (25s/div)
Time (10µs/div)
(VIN 3.6V; VOUT 1.8V; Load Output Voltage coupled) (top)
0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.00 1.40 1.20
Output Ripple
Inductor Current (bottom)
1.00 0.80 0.60 0.40 0.20 0.00
Time (40ns/div)
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AAT1140
SwitchRegFunctional Block Diagram
Fast Transient 600mA Step-Down Converter
note
Voltage Reference
Logic
INPUT
Note: adjustable version, internal feedback divider omitted tied directly internal error amplifier.
Functional Description
AAT1140 high performance 600mA 1.4MHz monolithic step-down converter. been designed with goal minimizing external component size optimizing efficiency over complete load range. Apart from small bypass input capacitor, only small filter required output. Typically, 4.7H inductor 4.7F ceramic capacitor recommended (see table values). fixed output version requires only three external power components (CIN, COUT, adjustable version programmed with external feedback voltage, ranging from 0.6V input voltage. addi-
tional feed-forward capacitor also added external feedback provide improved transient response (see Figure dropout, converter duty cycle increases 100% output voltage tracks input voltage minus RDS(ON) drop P-channel high-side MOSFET. input voltage range 2.7V 5.5V. converter efficiency been optimized load conditions, ranging from load 600mA. internal error amplifier compensation provides excellent transient response, load, line regulation. Soft start eliminates output voltage overshoot when enable input voltage applied.
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AAT1140
SwitchRegFast Transient 600mA Step-Down Converter
AAT1140
4.7F
4.7H
VOUT
100pF 442k 221k
Enable
Figure Enhanced Transient Response Schematic.
Control Loop
AAT1140 peak current mode step-down converter. current through P-channel MOSFET (high side) sensed current loop control, well short circuit overload protection. fixed slope compensation signal added sensed current maintain stability duty cycles greater than 50%. peak current mode loop appears voltage-programmed current source parallel with output capacitor. output voltage error amplifier programs current mode loop necessary peak switch current force constant output voltage load line conditions. Internal loop compensation terminates transconductance voltage error amplifier output. fixed voltage versions, error amplifier reference voltage internally program converter output voltage. adjustable output, error amplifier reference fixed 0.6V.
Current Limit Over-Temperature Protection
overload conditions, peak input current limited. minimize power dissipation stresses under current limit short-circuit conditions, switching terminated after entering current limit series pulses. Switching terminated seven consecutive clock cycles after current limit been sensed series four consecutive clock cycles. Thermal protection completely disables switching when internal dissipation becomes excessive. junction over-temperature threshold 140°C with 15°C hysteresis. Once over-temperature over-current fault condition removed, output voltage automatically recovers.
Under-Voltage Lockout
Internal bias circuits controlled input. Under-voltage lockout (UVLO) guarantees sufficient bias proper operation internal circuitry prior activation.
Soft Start Enable
Soft start limits current surge seen input eliminates output voltage overshoot. When pulled low, enable input forces AAT1140 into low-power, non-switching state. total input current during shutdown less than
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AAT1140
SwitchRegApplications Information
Inductor Selection
step-down converter uses peak current mode control with slope compensation maintain stability duty cycles greater than 50%. output inductor value must selected inductor current down slope meets internal slope compensation requirements. internal slope compensation adjustable low-voltage fixed versions AAT1140 0.24A/sec. This equates slope compensation that inductor current down slope 1.5V output 4.7H inductor.
Fast Transient 600mA Step-Down Converter
Configuration
0.6V Adjustable With External Feedback Fixed Output
Output Voltage
1.2V 1.5V, 1.8V 2.5V, 3.3V 0.6V 3.3V
Inductor
2.2H 4.7H 6.8H 4.7H
Table Inductor Values.
Input Capacitor
Select 4.7F ceramic capacitor input. estimate required input capacitor size, determine acceptable input ripple level (VPP) solve calculated value varies with input voltage maximum when double output voltage.
0.75 0.75 1.5V 0.24 4.7H
This internal slope compensation adjustable (0.6V) version low-voltage fixed versions. When externally programming 0.6V version 2.5V, calculated inductance 7.5H.
0.75
0.75 0.24A
CIN(MIN)
2.5V 7.5H
this case, standard 6.8H value selected. high-voltage fixed versions (2.5V), 0.48A/ sec. Table displays inductor values AAT1140 fixed adjustable options. 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. 4.7H CDRH2D14 series inductor selected from Sumida 135m typical current rating. full load, inductor loss 48mW which gives 4.5% loss efficiency 600mA, 1.8V output.
Always examine ceramic capacitor voltage coefficient characteristics when selecting proper value. example, capacitance 10F, 6.3V, ceramic capacitor with 5.0V applied actually about maximum input capacitor current
IRMS
input capacitor ripple current varies with input output voltage will always less than equal half total load current.
0.52
IRMS(MAX)
term appears both input voltage ripple input capacitor current equations maximum when twice VIN. This input
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AAT1140
SwitchRegvoltage ripple input capacitor current ripple maximum duty cycle. input capacitor provides impedance loop edges pulsed current drawn AAT1140. 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 (C2) seen evaluation board layout Figure
Fast Transient 600mA Step-Down Converter
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.
Figure AAT1140 Evaluation Board Component Side Layout.
Figure Exploded View Sample Layout.
Figure AAT1140 Evaluation Board Solder Side Layout.
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AAT1140
SwitchRegSince 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.
Fast Transient 600mA Step-Down Converter
Dissipation current ceramic output capacitor typically minimal, resulting less than degrees rise hot-spot temperature.
Adjustable Output Resistor Selection
applications requiring adjustable output voltage, 0.6V version externally programmed. Resistors Figure program output regulate voltage higher than 0.6V. limit bias current required external feedback resistor string while maintaining good noise immunity, minimum suggested value 59k. 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 good noise immunity 316k reduced load input current.
Output Capacitor
output capacitor limits output ripple provides holdup during large load transitions. 4.7F 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
VOUT 1.5V 0.6V 88.5k
adjustable version AAT1140, combined with external feedforward capacitor Figure delivers enhanced transient response extreme pulsed load applications. addition feedforward capacitor typically requires larger output capacitor stability. High Noise Immunity VOUT
19.6 29.4 39.2 49.9 59.0 68.1 78.7 88.7 88.7
COUT
ILOAD VDROOP
Input Current (Without Load) 316k
1000 1270 1430
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 4.7F. This effect loop crossover frequency (bandwidth), phase margin, gain margin. Increased output capacitance will reduce crossover frequency with greater phase margin. maximum output capacitor ripple current given
IRMS(MAX)
VOUT (VIN(MAX) VOUT) VIN(MAX)
Table Adjustable Resistor Values With 0.6V Step-Down Converter.
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AAT1140
SwitchRegThermal Calculations
There three types losses associated with AAT1140 step-down converter: switching losses, conduction losses, quiescent current losses. Conduction losses associated with RDS(ON) characteristics power output switching devices. Switching losses dominated gate charge power output switching devices. full load, assuming continuous conduction mode (CCM), simplified form losses given
Fast Transient 600mA Step-Down Converter
Since RDS(ON), quiescent current, switching losses vary with input voltage, total losses should investigated over complete input voltage range. Given total losses, maximum junction temperature derived from SOT23-5 package which 150°C/W.
TJ(MAX) PTOTAL TAMB
Output Dropout
dropout, duty cycle AAT1140 switching 100%. minimum dropout voltage determined RDS(ON)H inductor copper loss resistor. AAT1140 0.53 RDS(ON)H. inductor copper loss resistor varies with different inductor values manufacturer. safe dropout voltage 0.5V 600mA load. example, when load current 600mA, voltage dropped across RDS(ON)H 0.32V; inductor copper loss resistor 135m, voltage drop across inductor 0.08V. total voltage drop 0.4V. Considering manufacturer's tolerances, inductor copper loss resistor RDS(ON)H will vary from part part, 0.5V dropout window safe.
PTOTAL
(RDSON(HS) RDSON(LS) [VIN VO])
(tsw
step-down converter quiescent current. term used estimate full load step-down converter switching losses. condition where step-down converter dropout 100% duty cycle, total device dissipation reduces
PTOTAL RDSON(HS)
AAT1140
4.7F
4.7H
VOUT 1.8V
100pF 442k 221k
Enable
Figure AAT1140 Adjustable Evaluation Board Schematic.
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AAT1140
SwitchRegEfficiency
Besides AAT1140 device losses including switching losses, conduction losses, quiescent current losses, inductor copper loss also affects efficiency buck converter. buck converter, average current inductor equal output current loss inductor
Fast Transient 600mA Step-Down Converter
Layout
suggested 2-layer layout AAT1140 shown Figures following guide lines should used help ensure proper layout. power traces (GND, VIN) should kept short, direct, wide allow large current flow. Place sufficient multiple-layer pads when needed change trace layer. input capacitor (C1) should connect closely possible GND. output capacitor should connected closely possible. connection should short possible there should signal lines under inductor. feedback trace should separate from power trace connect closely possible load point. Sensing along high-current load trace will degrade load regulation. external feedback resistors used, they should placed closely possible minimize length high impedance feedback trace. resistance trace from load return should kept minimum. This will help minimize error regulation differences potential internal signal ground power ground.
PLOSS_L
Table shows some recommended inductors. larger size inductor usually smaller DCR. example: selecting CDRH2D14 4.7H 1.8V output, PLoss_L 48.6mW when output current 600mA, inductor loses 4.5% power; selecting CDRH3D23 4.7H, PLoss_L should 19.8mW, inductor losing power ratio only 1.8%. inductor size buck converter efficiency always trade-off real application.
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AAT1140
SwitchRegFast Transient 600mA Step-Down Converter
Step-Down Converter Design Example
Specifications
TAMB 1.8V 600mA (adjustable using 0.6V version), Pulsed Load ILOAD 300mA 2.7V 4.2V (3.6V nominal) 1.4MHz 85°C
1.8V Output Inductor
1.8V 5.4H (use 4.7H; Table
Sumida inductor CDRH3D16, 4.7H, 105m.
1.8V 1.8V 156mA 4.7H 1.4MHz 4.2V
IPKL1
0.6A 0.068A 0.668A
0.6A2 105m 38mW
1.8V Output Capacitor
VDROOP 0.1V
COUT IRMS
ILOAD 0.3A 6.4F; 10µF VDROOP 0.1V 1.4MHz (VO) (VIN(MAX) 1.8V (4.2V 1.8V) 45mArms VIN(MAX) 4.7H 1.4MHz 4.2V
Pesr IRMS2 (45mA)2
Input Capacitor
Input Ripple 25mV
4.87µF; 4.7µF 25mV 1.4MHz 0.6A
IRMS
0.3Arms
IRMS2 (0.3A)2 0.45mW
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AAT1140
SwitchRegAAT1140 Losses
PTOTAL (RDSON(HS) RDSON(LS) [VIN -VO])
Fast Transient 600mA Step-Down Converter
(tsw
0.62 (0.725 1.8V [4.2V 1.8V])
4.2V
(5ns 1.4MHz 0.6A 70A) 4.2V 118mW TJ(MAX) TAMB PLOSS 85°C (150°C/W) 118mW 102.7°C
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AAT1140
SwitchRegAdjustable Version (0.6V device) VOUT
1.85
Fast Transient 600mA Step-Down Converter
19.6 29.4 39.2 49.9 59.0 68.1 78.7 88.7
316k1
1000 1270 1430
Fixed Version VOUT
0.6-3.3V
Used
Table Evaluation Board Component Values. Inductance
Manufacturer
Sumida Sumida Sumida Sumida Murata Murata Coilcraft Coiltronics Coiltronics Coiltronics
Part Number
CDRH3D16-2R2 CDRH3D16-4R7 CDRH3D16-6R8 CDRH2D14 LQH2MCN4R7M02 LQH32CN4R7M23 LPO3310-472 SD3118-4R7 SD3118-6R8 SDRC10-4R7
Current
1.20 0.90 0.73 0.85 0.40 0.45 0.80 0.98 0.82 1.30
0.072 0.105 0.170 0.80 0.20 0.27 0.122 0.175 0.122
Size (mm) LxWxH
3.8x3.8x1.8 3.8x3.8x1.8 3.8x3.8x1.8 3.2x3.2x1.55 2.0x1.6x0.95 2.5x3.2x2.0 3.2x3.2x1.0 3.1x3.1x1.85 3.1x3.1x1.85 5.7x4.4x1.0
Type
Shielded Shielded Shielded Shielded Non-Shielded Non-Shielded Shielded Shielded Shielded
Table Typical Surface Mount Inductors. Manufacturer
Murata Murata Murata
Part Number
GRM219R61A475KE19 GRM21BR60J106KE19 GRM21BR60J226ME39
Value
4.7F
Voltage
6.3V 6.3V
Temp.
Case
0805 0805 0805
Table Surface Mount Capacitors.
reduced quiescent current, 316k.
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1140.2007.12.1.1
AAT1140
SwitchRegOrdering Information
Output Voltage1
Fast Transient 600mA Step-Down Converter
Package
SOT23-5 SOT23-5
Marking2
ZKXYY ZXXYY
Part Number (Tape Reel)3
AAT1140IGV-0.6-T1 AAT1140IGV-1.8-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
SOT23-5
2.85 0.15 1.90 0.95
1.575 0.125
1.10 0.20
0.60
2.80 0.20
1.20 0.25
0.15 0.07
GAUGE PLANE
0.40 0.10
0.075 0.075
0.60
0.45 0.15
0.10
dimensions millimeters.
Contact Sales other voltage options. 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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