Low-Supply-Current Synchronous Step-up DC-DC Converter Features 0
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APW7079
Low-Supply-Current Synchronous Step-up DC-DC Converter Features
0.9V Typical Start-up Input Voltage 11µA Typical Load Quiescent Current Operation High Efficiency Fixed 1.8V, 2.6V, 3.3V, 3.8V, 4.5V Output Voltage 600mA Internal Switch Current Interanl Synchronous Rectifier SOT89 Package Lead Free Available (RoHS Compliant)
APW7079 compact, mode, step-up DC-DC converter with quiescent current. internal synchronous rectifier reduces cost space eliminating need external Schottky diode. on-resistance internal switches improves efficiency 92%. start-up voltage guaranteed below After start-up, device operate with input voltage down 0.7V. APW7079 suitable portable battery-powered applications. Consuming only 11µA quiescent current optimized control scheme allow device operate very high efficiency over entire load current range.
Efficiency Output Current
Simplified Application Circuit
22µH 22µF
APW7079
VOUT
IOUT
VOUT
Efficiency
VIN=0.9V VIN=1.0V VIN=1.2V VIN=1.5V APW7079-30 1000 VIN=2.4V
47µF
Configuration
SOT89
Output Current, IOUT (mA)
Applications
Toys Wireless Mouses Portable Insturments
VOUT (TAB)
View
ANPEC reserves right make changes improve reliability manufacturability without notice, advise customers obtain latest version relevant information verify before placing orders. Copyright ANPEC Electronics Corp. Rev. Apr., 2007 www.anpec.com.tw
APW7079
Ordering Marking Information
APW7079 Lead Free Code Handling Code Temperature Range Package Code Voltage Code
Package Code SOT89 Operating Ambient Temperature Range Handling Code Tape Reel Plastic Lead Free Code Lead Free Device Voltage Code 1.8V 3.8V 2.6V 4.5V APW7079 XXXXX26 APW7079 XXXXX33 APW7079 XXXXX45 Blank Original Device 3.0V 5.0V XXXXX Date Code, 2.6V XXXXX Date Code, 3.3V 3.3V
APW7079-18DI: APW7079-30DI:
APW7079 XXXXX18 APW7079 XXXXX30 APW7079 XXXXX38 APW7079 XXXXX50
XXXXX Date Code, 1.8V XXXXX Date Code, 3.0V
APW7079-26DI: APW7079-33DI:
APW7079-38DI: APW7079-50DI:
XXXXX Date Code, 3.8V XXXXX Date Code, 5.0V
APW7079-45DI:
XXXXX Date Code, 4.5V
Note ANPEC lead-free products contain molding compounds/die attach materials 100% matte plate termination finish; which fully compliant with RoHS compatible with both SnPb lead-free soldering operations. ANPEC lead-free products meet exceed leadfree requirements IPC/JEDEC STD-020C classification lead-free peak reflow temperature.
Absolute Maximum Ratings (Note
Symbol VOUT TSTG TSDR VESD Voltage Storage Temperature Maximum Soldering Temperature, Seconds Minimum Rating (Human Body Mode) Parameter Output Voltage (VOUT GND) Rating -0.3 -0.3 VOUT+1 Unit
Note Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only functional operation device these other conditions beyond those indicated operational sections specifications implied Exposure absolute maximum rating conditions extended periods affect device reliability.
Thermal Characteristics
Symbol Parameter Thermal Resistance -Junction Ambient (Note SOT89 Typical Value Unit
Note measured with component mounted high effective thermal conductivity test board free air.
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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APW7079
Recommended Operating Conditions
Symbol VOUT IOUT Converter Supply Voltage Voltage Converter Output Current Ambient Temperature Junction Temperature Parameter Output Voltage (VOUT GND)
(Note
Range VOUT+1 -0.3 VOUT +0.3 IOUT(MAX)(Note Unit
Note Refer typical application circuit Note Refer "Application Information" detail value.
Electrical Characteristics
Refer Typical Application Circuits. VIN=1.5V, RLOAD 85oC, unless otherwise noted. Typical values TA=25oC.
Symbol
Parameter Converter Supply Voltage Start-up Voltage RLOAD=3k
Test Condition
Min.
APW7079 Typ. Max. 1.836 2.652 3.06 3.366 3.876 4.59
Unit
VOUT
Output Voltage
APW7079-18 APW7079-26 APW7079-30 APW7079-33 APW7079-38 APW7079-45 APW7079-50 VOUT VOUT(Typ.)+0.5V Measured VOUT Inductor Connected
1.764 2.548 2.94 3.234 3.724 4.41
TOFF(MIN) TON(MAX)
Supply Current Main Switch Min. Off-time Main Switch Max. On-time Main Switch Max. Duty
RN-FET
Main Switch Resistance
ILX=100mA
RP-FET
Synchronous Switch Resistance
ILX=100mA
APW7079-18 APW7079-26 APW7079-30 APW7079-33 APW7079-38 APW7079-45 APW7079-50 APW7079-18 APW7079-26 APW7079-30 APW7079-33 APW7079-38 APW7079-45 APW7079-50
ILIM
Main Switch Current Limit Main Switch Leakage Current Synchronous Switch Leakage Current Over Temperature Shutdown Over Temperature Hysteresis
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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APW7079
Typical Operating Characteristics
(Refer application circuit section "Typical Application Circuit", VIN=1.5V, L1=22µH, TA=25oC unless otherwise noted.)
Efficiency Output Current
1.84 1.82
Output Voltage Output Current
Output Voltage, VOUT
1.80 1.78 1.76 1.74 1.72 1.70 1.68 1.66 VIN=0.9V VIN=1.0V VIN=1.2V VIN=1.5V APW7079-18
Efficiency
VIN=0.9V VIN=1.0V VIN=1.2V VIN=1.5V APW7079-18
1.64 1000
Output Current, IOUT (mA)
Output Current, IOUT (mA)
Efficiency Output Current
Output Voltage Output Current
Output Voltage, VOUT
Efficiency
VIN=0.9V VIN=1.0V VIN=1.2V VIN=1.5V APW7079-30 VIN=2.4V
VIN=2.4V VIN=1.5V
VIN=1.2V VIN=1.0V VIN=0.9V APW7079-30
1000
Output Current, IOUT (mA)
Output Current, IOUT (mA)
Output Voltage Output Current
Output Voltage Output Current
Output Voltage, VOUT
Efficiency
1000 VIN=1.5V APW7079-50 VIN=0.9V VIN=1.0V VIN=1.2V VIN=2.4V VIN=3.6V
VIN=3.6V VIN=0.9V VIN=1.0V VIN=1.2V APW7079-50 VIN=2.4V VIN=1.5V
Output Current, IOUT (mA) Copyright ANPEC Electronics Corp. Rev. Apr., 2007
Output Current, IOUT (mA)
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APW7079
Typical Operating Characteristics (Cont.)
(Refer application circuit section "Typical Application Circuit", VIN=1.5V, L1=22µH, TA=25oC unless otherwise noted.)
Start-up/Hold-on Voltage Output Current
Start-up/Hold-on Voltage, /VHOLD
Start-up
Start-up/Hold-on Voltage Output Current
Hold-on APW7079-30 Start-up
Start-up/Hold-on Voltage, /VHOLD
Hold-on APW7079-18
Output Current, IOUT (mA)
Output Current, IOUT (mA)
Start-up/Hold-on Voltage Output Current
Load Battery Current, (µA)
Start-up
Start-up/Hold-on Voltage, /VHOLD
Load Battery Current Input Voltage
Hold-on
APW7079-50
APW7079-50
APW7079-18
APW7079-30
Output Current, IOUT (mA)
Input Voltage,
Main Switch Resistance Junction Temperature
Synchronous Switch Resistance, RP-FET
Synchronous Switch Resistance Junction Temperature
Main Switch Resistance, RN-FET
APW7079-18 APW7079-30 APW7079-50
APW7079-18 APW7079-30 APW7079-50
Junction Temperature, (oC) Copyright ANPEC Electronics Corp. Rev. Apr., 2007
Junction Temperature, (oC) www.anpec.com.tw
APW7079
Operating Waveforms
Load Transient Response
IOUT=10mA 110mA 10mA IOUT rise/fall time VIN=1.5V
Line Transient Response
IOUT 110mA
1.5V
10mA
VOUT
VOUT
CH2: IOUT, 100mA/Div, CH3: VOUT, 50mV/Div, Time: 0.1ms/Div
CH1: VIN, 0.5V/Div, CH3: VOUT, 50mV/Div, Time: 0.1ms/Div
Heavy Load Switching Waveform
IOUT=100mA, VIN=1.5V
VOUT
CH2: ILX, 200mA/Div, CH3: VOUT, 50mV/Div, CH4: VLX, 2V/Div, Time: 5µs/Div
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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APW7079
Descriptions
Name VOUT lowest EMI. Converter output control circuitry bias supply pin. Ground. Function Description Junction N-FET P-FET Drains. Connect inductor here minimize trace area
Block Diagram
VOUT
Zero Crossing Comparator 0.9µs Min. off-time Error Comparator VREF Control Logic Gate Driver Main Switch Thermal Shutdown Synchronous Switch
Max. on-time
Current Limit Comparator Soft start
RSENSE
Typical Application Circuit
22µH 22µF
APW7079
VOUT
IOUT
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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APW7079
Functional Descriptions
Control Scheme converter monitors output voltage, when internal feedback voltage falls below reference voltage, main switch turns inductor current ramps main switch turns when current reaches peak current limit typically 600mA. second criterion that turns switch maximum on-time (typical). main switch turned off, synchronous switch turned delivers current output. main switch remains minimum (typical), until internal feedback voltage drops below reference voltage. control scheme with quiescent current 11µA (typical), converter gets high efficiency over wide load range. Start-up startup oscillator circuit integrated APW7079. When power applied device, circuit pumps output voltage high. Once output voltage reaches 1.4V (typ), main DC-DC circuitry turns boosts output voltage final regulation point. Synchronous Rectification internal synchronous rectifier eliminates need external Schottky diode, thus reducing cost board space. During cycle off-time, P-channel MOSFET turns shunts MOSFET body diode. result, synchronous rectifier significantly improves efficiency without addition external component. Conversion efficiency high 92%. Over-Temperature Protection over-temperature circuit limits junction temperature APW7079. When junction temperature exceeds 150°C, thermal sensor turns power MOSFETs, allowing devices cool. thermal sensor allows converter start start-up process regulate output voltage again after junction temperature cools 40°C.The designed with 40°C hysteresis lowers average during continuous thermal overload conditions, increasing life time device. Where IPEAK peak current inductor where
Application Information
Input Capacitor Selection input capacitor chosen based voltage rating current rating. reliable operation, recommended select capacitor voltage rating least times higher than maximum input voltage. maximum current rating input capacitor calculated following equation: IRMS
main switch max. on-time (4µs typical) input voltage inductor value capacitors should placed close inductor GND. Output Capacitor Selection output capacitor required filter output supply load transient current. output ripple voltages across ideal output capacitor. peak-to-peak voltage calculated following equations: VESR IPEAK
IPEAK VOUT IOUT ILIM
efficiency (0.85 typical)
peak-to-peak voltage ideal output capacitor calculated following equations:
VCOUT IOUT COUT
applications using tantalum capacitors, VCOUT much smaller than ignored. Therefore, peak-to-peak output voltage (VOUT) shown below: VOUT IPEAK
Copyright ANPEC Electronics Corp. Rev. Apr., 2007 www.anpec.com.tw
APW7079
Application Information (Cont.)
Output capacitor Selection (Cont.) Since output ripple product peak inductor current output capacitor ESR, using low-ESR tantalum capacitors best performance, connecting more filter capacitors parallel recommended. Inductor Selection
ISWN ILIM IPEAK
inductor value determines inductor ripple current affects load transient response. recommended select boost inductor order keep maximum peak inductor current below current limit threshold power switch. example, current limit threshold APW7079' switch 600mA. choosing inductor which peak current passed, firstly necessary consider output load (IOUT), input (VIN), output voltage (VOUT). Secondly, desired current ripple inductor also needed taken into account. current calculated "Output Capacitor Selection". Since output ripple product peak inductor current output capacitor ESR, larger inductor value reduces inductor current ripple output voltage ripple typically offers larger physical size. inductor value also slightly affects maximum output current. maximum output current calculated below:
IOUT(MAX VOUT VOUT ILIM TOFF
VOUT
ISWP IOUT
VOUT
IPEAK
Thermal Considerations most applications, APW7079 does dissipate much heat high efficiency. However, applications where APW7079 running high ambient temperature with output voltage, heat dissipated exceed maximum junction temperature part. junction temperature reaches approximately 150°C, both power switches will turned node will becom high pedance. avoid 7079 from exceeding maximum junction temperature, user will need some thermal analysis. goal thermal analysis determine whether power dissipated exceeds maximum junction temperature part. temperature rise
where TOFF main switch min. off-time (0.9µs typical) Therefore, consider balance efficiency component size, inductor value 22µH 47µH recommended most applications.
ISWP N-FET ISWN P-FET COUT IOUT VOUT
given (PD)(JA) where power dissipated regulator thermal resistance from junction ambient temperature. junction temperature, given
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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APW7079
Application Information (Cont.)
Thermal Considerations (Cont.) where ambient temperature. power dissipation calculated below: POUT (1-)/ where POUT Output power (VOUT IOUT) Efficiency example, APW7079-18 converts input voltage 1.2V provide load current 175mA ambient temperature 85°C. Assume efficiency 0.75. Therefore, power dissipated converter 0.175 (1-0.75)/0.75= 0.105 Watt Since power dissipation includes loss external components, actual value slightly lower. SOT89 package, 180°C/W. Thus, junction temperature regulator 85°C (PD)(180) maximum junction temperature should less than 125°C. Note that, junction temperature lower higher output voltages reduced switch resistance. Layout Considerations switching power supplies especially with high peak currents switching frequency, layout important step design. layout carefully done, regulator show noise problems duty cycle jitter. 1.The input capacitor should placed close device, which reduce copper trace resistance effect input ripple 2.The inductor should placed close possible switch minimize switching noise. 3.The output capacitor should place closed VOUT GND.
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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APW7079
Package Information
SOT89
SOT89 MILLIMETERS MIN. 1.40 0.44 0.36 0.35 4.40 1.62 2.29 2.13 1.50 3.00 3.94 0.89 4.25 1.20 0.155 0.035 MAX. 1.60 0.56 0.48 0.44 4.60 1.83 2.60 2.29 MIN. 0.055 0.017 0.014 0.014 0.173 0.064 0.090 0.084 0.059 0.118 0.167 0.047 INCHES MAX. 0.063 0.022 0.019 0.017 0.181 0.072 0.102 0.090
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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APW7079
Carrier Tape Reel Dimensions
Application
13.5 0.15 1.5±
0.15
4.5±
1.75±
SOT89
0.05 1.5±
1.80± 0.3±0.013
(mm)
Cover Tape Dimensions
Application SOT89 Devices Reel 1000
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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APW7079
Physical Specifications
Terminal Material Lead Solderability Solder-Plated Copper (Solder Material: 90/10 63/37 SnPb), 100%Sn Meets Specification RSI86-91, ANSI/J-STD-002 Category
Reflow Condition
(IR/Convection Reflow)
Critical Zone Ramp-up
Temperature
Tsmax
Tsmin Ramp-down Preheat
25°C Peak
Time
Classification Reflow Profiles
Profile Feature Average ramp-up rate Preheat Temperature (Tsmin) Temperature (Tsmax) Time (min max) (ts) Time maintained above: Temperature (TL) Time (tL) Peak/Classification Temperature (Tp) Time within actual Peak Temperature (tp) Ramp-down Rate Time 25°C Peak Temperature Sn-Pb Eutectic Assembly 3°C/second max. 100°C 150°C 60-120 seconds 183°C 60-150 seconds table 10-30 seconds 6°C/second max. minutes max. Pb-Free Assembly 3°C/second max. 150°C 200°C 60-180 seconds 217°C 60-150 seconds table 20-40 seconds 6°C/second max. minutes max.
Notes: temperatures refer topside package. Measured body surface.
Copyright ANPEC Electronics Corp. Rev. Apr., 2007 www.anpec.com.tw
APW7079
Classification Reflow Profiles (Cont.)
Table SnPb Entectic Process Package Peak Reflow Temperatures Package Thickness <2.5 Volume <350 +0/-5°C +0/-5°C
Volume +0/-5°C +0/-5°C
Table Pb-free Process Package Classification Reflow Temperatures Volume Volume Volume <350 350-2000 >2000 <1.6 +0°C* +0°C* +0°C* +0°C* +0°C* +0°C* +0°C* +0°C* +0°C* Tolerance: device manufacturer/supplier shall assure process compatibility including stated classification temperature (this means Peak reflow temperature +0°C. example 260°C+0°C) rated level. Package Thickness
Reliability Test Program
Test item SOLDERABILITY HOLT Latch-Up Method MIL-STD-883D-2003 MIL-STD-883D-1005.7 JESD-22-B,A102 MIL-STD-883D-1011.9 MIL-STD-883D-3015.7 JESD Description 245°C, 1000 Bias @125°C Hrs, 100%RH, 121°C -65°C~150°C, Cycles VHBM 2KV, 200V 10ms, 100mA
Customer Service
Anpec Electronics Corp. Head Office No.6, Dusing Road, SBIP, Hsin-Chu, Taiwan, R.O.C. 886-3-5642000 886-3-5642050 Taipei Branch 137, Lane 235, Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, 886-2-89191368 886-2-89191369
Copyright ANPEC Electronics Corp. Rev. Apr., 2007
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