1.5MHz, 600mA, Synchronous Buck Regulator Features 600mA Out
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APW7101
1.5MHz, 600mA, Synchronous Buck Regulator
Features
600mA Output Current 2.5V 5.5V Input Voltage Range 1.5MHz Constant Frequency Operation Dropout Operation 100% Duty Cycle Synchronous Topology: Schottky Diode Required 0.6V Reference Voltage Shutdown Mode Supply Current Under Current Mode Operation Excellent Line Load Transient Response Over-Temperature Protection Over Current Protection SOT-23-5 Package Lead Free Green Devices Available (RoHS Compliant)
General Description
APW7101 high efficiency monolithic synchronous buck regulator. 7101 operates with constant 1.5MHz switching frequency using inductor current controlled quantity current mode architecture. device available adjustable version fixed output voltages 1.5V 1.8V. 2.5V 5.5V input voltage range makes APW7101 ideally suited single Li-Ion battery powered applications. 100% duty cycle provides dropout operation, extending battery life portable electrical devices. internally fixed 1.5MHz operating frequency allows small surface mount inductors capacitors. synchronous switches included inside increase efficiency eliminate need external Schottky diode. output voltages easily supported with 0.6V feedback reference voltage. APW7101 available profile package saving printed circuit board area.
Applications
Cellular Telephones Personal Information Appliances Wireless Modems Players Digital Still Cameras Portable Instruments
Configuration
View APW7101 View VOUT
APW7101 1.5V/1.8V
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. Jun., 2008 www.anpec.com.tw
APW7101
Ordering Marking Information
APW7101 Package Code SOT-23-5 Temperature Range Assembly Material Handling Code Handling Code Temperature Range Tape Reel Voltage Code Package Code 1.5V 1.8V Blank Adjustable Version Voltage Code Assembly Material Lead Free Device Halogen Lead Free Device 019X W01X Date Code Date Code APW7101-18 01CX Date Code
APW7101-15 APW7101
Note ANPEC lead-free products contain molding compounds/die attach materials 100% matte plate termination finish; which fully compliant with RoHS. ANPEC lead-free products meet exceed lead-free requirements IPC/JEDEC J-STD020C classification lead-free peak reflow temperature. ANPEC defines "Green" mean lead-free (RoHS compliant) halogen free does exceed 900ppm weight homogeneous material total does exceed 1500ppm weight).
Absolute Maximum Ratings
Symbol VRUN ISW_PEAK TSTG TSDR Parameter Input Supply Voltage (VCC GND) Voltage Feedback Voltage Switching Voltage Peak Current Average Power Dissipation Junction Temperature, Storage Temperature Maximum Lead Soldering Temperature, Seconds Value -0.3V -0.3V (VCC+0.3V) -0.3V (VCC+0.3V) -0.3V (VCC+0.3V) Unit
Thermal Characteristics
Symbol Parameter Junction Ambient Thermal Resistance Free Typical Value Unit °C/W
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Electrical Characteristics
denotes specifications that apply over -40°C 85°C, otherwise specifications TA=25°C.
APW7101 Symbol IVFB Parameter Feedback Current Input Voltage Range Regulated Feedback Voltage Reference Voltage Line Regulation *Note -40°C 85°C 2.5V 5.5V APW7101-1.5, IOUT 100mA VOUT VOUT Regulated Output Voltage APW7101-1.8, IOUT=100mA Output Voltage Line Regulation 2.5V 5.5V 0.5V Peak Inductor Current VOUT Duty 0.75 1.25 1.746 1.800 0.04 1.854 Test conditions Min. 0.585 1.455 Typ. 0.04 1.500 Max. 0.615 1.545 Unit
VLOADR IQ_SD fOSC fOSC_FFB RDSON_P RDSON_N ILSW VRUN IRUN
Output Voltage Load Regulation Quiescent Current Quiescent Current Shutdown Oscillator Frequency Frequency Foldback Resistance MOSFET Resistance MOSFET Leakage Current Threashold Leakage Current 0.6V VOUT 100% VOUT 100mA -100mA VRUN Duty Cycle 1.5V
0.35 ±0.01 ±0.01 0.45
Note: Maximum output current didn' reach 600mA when supply voltage below 2.7V.
Descrpition
VFB/VOUT FUNCTION Control input pin. Forcing this above 1.5V enables APW7101. Forcing this below 0.3V shuts down APW7101. shutdown situation, functions disabled decrease supply current below 1µA.There pull high pull ability inside. Ground pin. Connected this inductor power stage. This connected drain terminals main synchronous power MOSFET switches inside. Must closely decoupled with 4.7µF greater ceramic capacitor. adjustable version, feedback function available. feedback voltage decided external resistive divider across output. fixed version, internal resistive divider divides output voltage down comparison internal reference voltage.
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Block Diagram
Slop Compensation ICOMP Frequency Shift RSENSE 0.6V Shutdown Control Logic QSENSE Reverse detect Oscillator
Application Circuit
2.5V 5.5V
APW7101
2.2µH 470K 150K
VOUT=2.5V
2.5V 5.5V
APW7101/1.5V/1.8V
2.2µH
VOUT
4.7µF
COUT 10µF
4.7µF
COUT 10µF
CIN: Murata GRM31CR61C475K COUT: Murata GRM31CR61A106K Gotrend GTSD53
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Typical Operating Characteristics
Reference Voltage
0.615 0.610
1800 1700
VIN=5.5V
Oscillator Frequency
Reference Voltage
0.600 0.595 0.590 0.585
Frequency (kHz)
0.605
VIN=2.5V
1600 1500 1400 1300 1200
VIN=3.6V
Temperature
Temperature
Oscillator Frequency Supply Voltage
1800
RDS(ON) Temperature
TA=25o
1700
VIN=4.2V VIN=3.6V
VIN=2.7V
Frequency (kHz)
Resistance
1600 1500 1400 1300 1200
NMOS PMOS
Supply Voltage
Temperature
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Typical Operating Characteristics (Cont.)
RDS(ON) Input Voltage
Efficiency Output Current
PMOS
VOUT=1.2V TA=25o
VIN=2.7V
Resistance
Efficiency
NMOS
VIN=3.6V
VIN=4.2V
10.0 100.0 1000.0
Input Voltage
Output Current (mA)
Efficiency Output Current
Efficiency Output Current
VOUT=1.5V TA=25o
VIN=2.7V
VOUT=2.5V TA=25o
VIN=4.2V
VIN=3.6V Efficiency
Efficiency
VIN=3.6V
10.0 100.0 1000.0
VIN=4.2V
VIN=2.7V
10.0
100.0
1000.0
Output Current (mA)
Output Current (mA)
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Typical Operating Characteristics (Cont.)
Efficiency Output Current
OUT=1V L=2.2uH TA=25°C
1.008 1.006 1.004
Output Voltage Output Current
L=2.2uH TA=25°C
IN=3.3V
Output Voltage (mV)
Efficiency
1.002 0.998 0.996 0.994 0.992 0.99 0.988
IN=5V
IN=5V
IN=3.3V
1000
Output Current (mA)
Output Current (mA)
Efficiency Input Voltage
Efficiency Input Voltage
IOUT=100mA
IOUT=600mA
IOUT=100mA IOUT=600mA Efficiency
VOUT=1.8V TA=25o
Efficiency
IOUT=10mA
IOUT=10mA
VOUT=1.5V TA=25o
Input Voltage
Input Voltage
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Typical Operating Characteristics (Cont.)
Efficiency Input Voltage
Dynamic Supply Current Supply Voltage
IOUT=100mA
Dynamic Supply Current (µA)
IOUT=600mA
Efficiency
IOUT=10mA
VOUT=2.5V TA=25o
Input Voltage
Supply Voltage
P-FET Leakage Temperature
N-FET Leakage Temperature
P-FET Leakage(nA)
N-FET Leakage(nA)
VIN=5.5V
VIN=5.5V
Temperature
Temperature
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Function Description
Main Control Loop APW7101 uses constant frequency, current mode step-down architecture. Both main synchronous switches internal reduce external components. During normal operation, internal PMOSFET turned turned when inductor current input ICOMP reset latch. load current increases, causes slight decrease feedback voltage, which turn, causes outs voltage increase until average inductor current matches load current. While internal power PMOSFET off, internal power NMOSFET turned until inductor current starts reverse, indicated current reversal comparator IRCMP, beginning next cycle. When NMOSFET turned IRCMP, operates discontinuous conduction mode. Pulse Skipping Mode Operation light load with relative small inductance, inductor current reach zero. internal power NMOSFET turned current reversal comparator, IRCMP, switching voltage will ring. This discontinuous mode operation, normal behavior switching regulator. very light load, APW7101 will automatically skip some pulses pulse skipping mode maintain output regulation. skipping process modulates smoothly depend load. Short Circuit Protection short circuit situation, output voltage almost zero volts. Output current limited ICOMP prevent damage electrical circuit. normal operation, straight line inductor current ripple have same height, means volts-seconds product same. When short circuit operation occurs, output voltage down zero leads voltage across inductor maximum period voltage across inductor minimum period. order maintain volts-seconds balance, offtime must extended prevent inductor current away. Frequency decay will extend switching period provide more times off-period, then inductor
Copyright ANPEC Electronics Corp. Rev. Jun., 2008 www.anpec.com.tw
current restrict protect electrical circuit short situation. Dropout Operation input supply voltage decreases value approaching output voltage, duty cycle increases toward maximum time. Further reduction supply voltage forces main switch remain more than cycle until reaches 100% duty cycle. output voltage will then determined input voltage minus voltage drop across PMOSFET inductor. important detail remember that resistance PMOSFET switch will increase input supply voltage. Therefore, user should calculate power dissipation when APW7101 used 100% duty cycle with input voltage. Slope Compensation Slope compensation provides stability constant frequency current mode architecture preventing subharmonic oscillations high duty cycle. accomplished internally adding compensating ramp inductor current signal duty cycle excess 40%. Normally, this results reduction maximum inductor peak current duty cycles greater than 40%. APW7101, reduction inductor peak current recovered special skill high duty ratio. This allows maximum inductor peak current maintain constant level through duty ratio.
APW7101
Application Information
Inductor Selection high switching frequency 1.5MHz, inductor value application field APW7101 usually from 4.7µH. criterion select suitable inductor dependent worst current ripple throughout inductor. worst current ripple defines fully load capability. APW7101 applications, worst value current ripple 240mA, 600mA. Evaluate equation (1):
Figure-1 shows schematic Buck structure. waveforms shown Figure-2.
IOUT
(VIN
I(CIN)
where switching frequency APW7101 value worst current ripple, value current ripple that smaller than worst value accept. order perform high efficiency, selecting resistance inductor helpful way. Another important parameter current rating inductor. minimum value current rating equals full load value 600mA, plus half worst current ripple, 120mA. Choose inductors with suitable current rating ensure inductors don' operate saturation. Input Capacitor Selection
(1-D)*TS D*TS I(COUT) I(Q1)
IOUT
input capacitor must able support maximum input operating voltage maximum input current. Buck converter absorbs current from input pulses.
Figure-2
Observe waveform I(CIN),the value I(CIN)
I(CIN
Replace following relation:
VOUT
IOUT
value input capacitor current equal:
I(CIN IOUT
Figure-1
When D=0.5 current input capacitor will maximum value. this value choose input capacitor with suitable current rating.
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Application Information (Cont.)
Output Capacitor Selection output voltage ripple significant parameter estimate performance convertor. There discrete components that affect output voltage ripple bigger smaller. recommended criterion mentioned above choose suitable inductor. Then based this known inductor current ripple condition, value properties output capacitor will affect output voltage ripple better worse. output voltage ripple consists portions, product inductor current ripple, other portion function inductor current ripple output capacitance. Figure-3 shows waveforms explain part decided output capacitance.
VOUT
Thermal Consideration
APW7101 high efficiency switching converter, means less power loss transferred into heat. resistance difference between internal power PMOSFET NMOSFET, power dissipation high converting ratio greater than converting ratio. worst case dropout operation, mainly conduction loss dissipate internal power PMOSFET. power dissipation nearly defined
(IOUT
APW7101 internal over temperature protection. When junction temperature reaches centigrade, APW7101 will turn both internal power PMOSFET
I(COUT)
NMOSFET. estimation junction temperature, defined
.(10
0.5TS VOUT1 VOUT
where thermal resistance package utilized APW7101. Output Voltage Setting
Figure-3
Evaluate VOUT1 ideal energy equalization. According definition
APW7101 adjustable version output voltage setting users. suggestion maximum value 200k keep minimum current that provides enough noise rejection ability through resistor divider. output voltage programmed equation:
VOUT
where inverse switching frequency inductor current ripple. Move COUT left side estimate value VOUT1 equation (7).
APW7101
mentioned above, part output voltage ripple product inductor current ripple output capacitor. equation explains output voltage ripple estimation.
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
Figure-4
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APW7101
Application Description (Cont.)
Layout Consideration APW7101 high efficiency DC-DC converter which noise source electrical circuit switching operating. Some layout considerations suppress effect switching operating APW7101 itself improve better regulation. Keep power trace wide short possible. power trace shows Figure-6 thick solid lines. close COUT near inductor possible. Keep ground terminal COUT close possible minimize current loop. voltage divider consist closely connection path between VOUT must away prevent switch noise coupling into crosstalk. necessary, connection path between VOUT must near ground trace between feedback trace prevent coupling.
2.5V 5.5V 4.7µF
APW7101
Figure-6 Suggested layout Side
2.2µH
VOUT
COUT 10µF
2.5V 5.5V 4.7µF
APW7101/1.5V/1.8V
2.2µH
VOUT
COUT 10µF
Figure-5
Figure-7 Suggested layout Button Side
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Package Information
SOT-23-5
VIEW
0.25
GAUGE PLANE SEATING PLANE VIEW SOT-23-5 INCHES MIN. MAX. 0.057 0.000 0.035 0.012 0.003 0.106 0.102 0.055 0.037 0.075 0.60 0.012 0.024 0.006 0.051 0.020 0.009 0.122 0.118 0.071 MAX. 1.45 0.15 1.30 0.50 0.22 3.10 3.00 1.80
MILLIMETERS MIN.
0.00 0.90 0.30 0.08 2.70 2.60 1.40 0.95 1.90 0.30
Note Follow JEDEC TO-178 Dimension include mold flash, protrusions gate burrs. Mold flash, protrusion gate burrs shall exceed side.
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Carrier Tape Reel Dimensions
SECTION SECTION
Application
20.2 MIN.
3.5± 0.05
178.0± 2.00 MIN. SOT-23-5 4.0± 0.10 4.0± 0.10
8.4+2.00 13.0+0.50 MIN. -0.00 -0.20 2.0± 0.05 1.5+0.10 -0.00 MIN.
8.0± 0.30 1.75± 0.10
0.6+0.00 0.20 3.10± 0.20 1.50± 0.20 -0.40 3.20± (mm)
Devices Unit
Package Type SOT-23-5 Unit Tape Reel Quantity 3000
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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APW7101
Reflow Condition
Ramp-up Tsmax
(IR/Convection Reflow)
Critical Zone
Temperature
Tsmin Ramp-down Preheat
25°C Peak
Time
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
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 Sn-Pb Eutectic Assembly 3°C/second max. 100°C 150°C 60-120 seconds 183°C 60-150 seconds table 10-30 seconds 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. 6°C/second max. minutes max. minutes max. Time 25°C Peak Temperature Note: temperatures refer topside package. Measured body surface.
Copyright ANPEC Electronics Corp. Rev. Jun., 2008 www.anpec.com.tw
APW7101
Classification Reflow Profiles (Cont.)
Table SnPb Eutectic Process Package Peak Reflow Temperatures Package Thickness Volume <350 <2.5 +0/-5°C +0/-5°C Volume +0/-5°C +0/-5°C
Table Pb-free Process Package Classification Reflow Temperatures Package Thickness 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.
Customer Service
Anpec Electronics Corp. Head Office No.6, Dusing Road, SBIP, Hsin-Chu, Taiwan 886-3-5642000 886-3-5642050 Taipei Branch Lane 218, Jhongsing Rd., Sindian City, Taipei County 23146, Taiwan 886-2-2910-3838 886-2-2917-3838
Copyright ANPEC Electronics Corp. Rev. Jun., 2008
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