Dual 1.5MHz, 600mA Synchronous Step-Down Converter Features
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APW7134
Dual 1.5MHz, 600mA Synchronous Step-Down Converter
Features
600mA Output Current Each Channel 2.5V 5.5V Input Voltage Range 1.5MHz Constant Frequency Operation Dropout Operation 100% Duty Cycle Synchronous Topology 0.6V Reference Voltage Typically Shutdown Current Current Mode Operation Over Temperature Protection Over Current Protection Efficiency Internally Compensated Lead Free Available (RoHS Compliant)
General Description
APW7134 contains independent 1.5MHz constant frequency, current mode, step-down converters. Each converter integrates main switch synchronous rectifier high efficiency without external Schottky diode. APW7134 ideal powering portable equipment that runs from single cell Lithium-Ion (Li+) battery. Each converter supply 600mA load current from 2.5V 5.5V input voltage. output voltage regulated 0.6V. APW7134 also 100% duty cycle dropout applications.
Pinouts
APW7134 (Top View) DFN-10 (3mm 3mm)
GND1
Applications
Tuner/Box Portable Instrument
GND2
Exposed backside
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. Aug., 2006 www.anpec.com.tw
APW7134
Ordering Marking Information
APW7134 Lead Free Code Handling Code Temp. Range Package Code Package Code DFN-10 Temp. Range Handling Code Tube Tape Reel Lead Free Code Lead Free Device Blank Original Device
APW7134
7134 XXXXX
XXXXX Date Code
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 soldiering operations. ANPEC lead-free products meet exceed lead-free requirements IPC/JEDEC STD-020C classification lead-free peak reflow temperature.
Block Diagram
Slop Compensation
ICOMP
Frequency Shift FB1/ 0.6V EN1/ Shutdown Control Logic RSENSE QSENSE SW1/ Oscillator IN1/
IRCMP
GND1/ GND2
Diagram Represents APW7134
Copyright ANPEC Electronics Corp. Rev. Aug., 2006 www.anpec.com.tw
APW7134
Description
Name Function Channel Enable Control Input. Drive above 1.5V turn Channel Drive below 0.3V turn off. shutdown situation, functions disabled decrease supply current below 1µA.There pull high pull ability inside. Channel Feedback Input. Connect center point external resistor divider. feedback voltage 0.6V. Channel Supply Input. Bypass with 4.7µF greater ceramic capacitor. Ground Connected exposed GND2. Channel Power Switch Output. Inductor connection drains internal PMOSFET NMOSFET switches. Channel Enable Control Input. Drive above 1.5V turn Channel Drive below 0.3V turn off. shutdown situation, functions disabled decrease supply current below 1µA.There pull high pull ability inside. Channel Feedback Input. Connect center point external resistor divider. feedback voltage 0.6V. Channel Supply Input. Bypass with 4.7µF greater ceramic capacitor. Ground Connected exposed GND1. Channel Power Switch Output. Inductor connection drains internal PMOSFET NMOSFET switches.
GND2
GND1
Absolute Maximum Ratings
Symbol VIN1/IN2 VFB1/FB2 VEN1/EN2 VSW1/SW2 ISW_PEAK TSTG TSDR VESD Parameter Input Supply Voltage (IN1/IN2 GND1/GND2) Voltage Voltage Voltage Peak Current Junction temperature Storage temperature Soldering temperature, seconds Minimum rating (Human body mode) (Note Value -0.3 -0.3 VIN1/IN2+0.3 -0.3 VIN1/IN2+0.3 -0.3 VIN1/IN2+0.3 Unit
Note device sensitive. Handling precautions recommended.
Thermal Characteristics
Symbol Parameter Junction-to-Ambient Resistance free (Note Value Unit °C/W
Note measured approximately square copper.
Copyright ANPEC Electronics Corp. Rev. Aug., 2006
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APW7134
Recommended Operating Conditions (Note
Symbol VIN1/IN2 R2/R4 IOUT Parameter Input Supply Voltage (IN1/IN2 GND1/GND2) Feedback Resistance (Note Output Current Operating ambient temperature Operating junction temperature Min. Value Typ. Max. Unit
Note Please refer typical application circuit.
Electrical Characteristics
denotes specifications that apply over -40°C 85°C, otherwise specifications TA=25°C
Symbol
Parameter
Test Conditions Min. VFB1/FB2=0.6V 0.588
APW7134 Typ. Max. 0.612
Unit
VIN1/IN2 Each Converter Input Voltage Range IFB1/FB2 Each Converter Feedback current VFB1/FB2 VFB1/FB2 Each Converter Regulated Feedback Voltage Each Converter Reference voltage Line regulation VIN1/IN2=2.5V 5.5V VIN1/IN2=3V,VFB=0.5V Each Converter Peak Inductor Current VOUT=90%, Duty cycle VLOADR Each Converter Load Regulation Each Converter Quiescent Current Duty Cycle=0; VFB=1.5V
0.04
0.75
1.25
Copyright ANPEC Electronics Corp. Rev. Aug., 2006
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APW7134
Electrical Characteristics (Cont.)
denotes specifications that apply over -40°C 85°C, otherwise specifications TA=25°C
Symbol
Parameter Each Converter Quiescent Current Shutdown Each Converter Oscillator Frequency
Test Conditions Min.
APW7134 Typ. Max.
Unit
IQ-SD fOSC
VEN1/EN2=0V,VIN=4.2V VFB=0.6V VFB=0V ISW=100mA
fOSC_FFB Each Converter Frequency Foldback RDS-P Each Converter Resistance PMOSFET Each Converter Resistance NMOSFET Each Converter Leakage Current
RDS-N
ISW=-100mA VEN1=0V,VSW=0V 5V,VIN=5V
0.35
0.45
ILSW
±0.01 ±0.01
VEN1/EN2 Each Converter Enable Threashold IEN1/EN2 EN1/EN2 Leakage Current
Application Circuit
VIN1/IN2 CIN1 4.7uF VOUT1 1.8V 600mA 2.2uH 2.2uH CIN2 4.7uF VOUT2 3.3V 600mA
100K
100K
APW7134
300K COUT1 10uF 150K
GND1 GND2
680K 150K COUT2 10uF
Typical Application
Copyright ANPEC Electronics Corp. Rev. Aug., 2006
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APW7134
Typical Operating Characteristics
Reference Voltage
0.615 0.610
VIN=5.5V
Oscillator Frequency
1800 1700
Reference Voltage
Frequency (KHz)
0.605 0.600 0.595 0.590 0.585
VIN=2.5V
1600 1500 1400 1300 1200
VIN=3.6V
Temperature
Temperature
Oscillator Frequency Supply Voltage
1800
RDS(ON) Temperature
VIN=2.7V
TA=25o
1700 1600 1500 1400 1300 1200
VIN=4.2V VIN=3.6V
Resistance
Frequency (KHz)
NMOS PMOS
Supply Voltage
Temperature
Copyright ANPEC Electronics Corp. Rev. Aug., 2006
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APW7134
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
Efficiency
VIN=3.6V
10.0 100.0 1000.0
Efficiency
VIN=3.6V
10.0 100.0 1000.0
VIN=4.2V
VIN=2.7V
Output Current (mA)
Output Current (mA)
Copyright ANPEC Electronics Corp. Rev. Aug., 2006
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APW7134
Typical Operating Characteristics (Cont.)
Efficiency Input Voltage
Efficiency Input Voltage
IOUT=100mA
IOUT=600mA
IOUT=100mA
Efficiency
Efficiency
IOUT=600mA
VOUT=1.8V TA=25o
IOUT=10mA
IOUT=10mA
VOUT=1.5V TA=25o
Input Voltage
Input Voltage
Efficiency Input Voltage
Dynamic Supply Current Supply Voltage
IOUT=100mA
Dynamic Supply Current (µA)
Efficiency
IOUT=600mA
IOUT=10mA
VOUT=2.5V TA=25o
Input Voltage
Supply Voltage
Copyright ANPEC Electronics Corp. Rev. Aug., 2006
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APW7134
Typical Operating Characteristics (Cont.)
PMOSFET Leakage Temperature
NMOSFET Leakage Temperature
PMOSFET Leakag(nA)
VIN=5.5V
NMOSFET Leakage(nA)
VIN=5.5V
Temperature
Temperature
Functional Descriptions
Main Control Loop APW7134 dual independent constant frequency current mode step-down converters. 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 output voltage crease 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. 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
Copyright ANPEC Electronics Corp. Rev. Aug., 2006 www.anpec.com.tw
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, APW7134 will automatically skip some pulses pulse skipping mode maintain output regulation. skipping process modulates smoothly depend load. Short Circuit Protection
APW7134
Functional Descriptions (Cont.)
Short Circuit Protection Cont. zero leads voltage across inductor maximum period voltage across inductor minimum period. order maintain volts-seconds balance, off-time must extended prevent inductor current away. Frequency decay will extend switching period provide more times off-period, then inductor current have restrict protect electrical circuit short situation. Dropout Operation important detail remember that resistance PMOSFET switch will increase input supply voltage. Therefore, user should calculate power dissipation when APW7134 used 100% duty cycle with input voltage. Slope Compensation Slope compensation provides stability constant frequency current mode architecture preventing sub-harmonic 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%. APW7134, reduction inductor peak current recovered special skill high duty ratio. This allow maximum inductor peak current maintain constant level through duty ratio.
Application Description
Inductor Selection selecting resistance inductor helpful way. high switching frequency 1.5MHz, Another important parameter current rating inductor value application field APW7134 inductor. minimum value current usually from 4.7µH. criterion selecting rating equals full load value 600mA, plus suitable inductor dependent worst current half worst current ripple, 120mA. Choose ripple throughout inductor. worst current ripple inductors with suitable current rating ensure defines fully load capability. inductors don' operate saturation. APW7134 applications, worst value current ripple 240mA, 600mA. Evaluate Input Capacitor Selection equation (1):
input capacitor must able support
maximum input operating voltage maximum input current. Buck converter absorbs current from input pulses.
where switching frequency APW7134 value worst current ripple, value current ripple that smaller than worst value accept. order perform high efficiency,
Copyright ANPEC Electronics Corp. Rev. Aug., 2006 www.anpec.com.tw
APW7134
Application Description (Cont.)
Input Capacitor Selection Cont. Observe waveform I(CIN),the value I(CIN)
I(CIN
I(Q1) I(CIN) I(L) COUT I(COUT) IOUT
Replace following relation:
VOUT
IOUT
value input capacitor current equal:
IOUT
Figure-1 Figure-1 shows schematic Buck structure. waveforms show Figure-2.
IOUT
When D=0.5 current input capacitor will maximum value. this value choose input capacitor with suitable current rating. 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
I(COUT)
I(CIN)
inductor current ripple output capacitance. Figure-3 shows waveforms explain part decided output capacitance.
I(Q1)
IOUT D*TS (1-D)*TS
0.5TS
I(COUT)
VOUT1
Figure-2 Figure-3
Copyright ANPEC Electronics Corp. Rev. Aug., 2006 www.anpec.com.tw
APW7134
Application Description (Cont.)
Output Capacitor Selection Evaluate VOUT1 ideal energy equalization. According definition
VOUT
Output Voltage Setting APW7134 adjustable version output volt setting users. suggestion maximum value 200K keep minimum current that provides enough noise rejection ability through resistor divider. output voltage programmed equation:
VOUT
VOUT
where inverse switching frequency inductor current ripple. Move COUT left side estimate value VOUT1 equation (7).
VOUT
(11)
APW7134
mentioned above, part output voltage ripple product inductor current ripple output capacitor. equation explains output voltage ripple estimation.
VOUT
Layout Considerations high current paths (GND1/GND2, IN1/IN2 SW1/SW2) should placed very close device with short, direct wide traces. Input capacitors should placed close possible respective pins. external feedback resistors shall placed next pins. Keep switching nodes SW1/SW2 short away from feedback network.
Thermal Considerations APW7134 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 RDS_ RDS_
APW7134 internal over temperature protection. junction temperature reaches centigrade, APW7134 will turn both internal power PMOSFET NMOSFET. estimation junction temperature, defined
(10)
where thermal resistance package utilized APW7134.
Copyright ANPEC Electronics Corp. Rev. Aug., 2006 www.anpec.com.tw
APW7134
Package Information
DFN-10
Millimeters Min. Max. 0.80 1.00 0.00 0.05 0.20 0.18 0.30 3.00 2.20 2.50 3.00 1.50 1.80 0.50 0.35 0.45
Inches Min. Max. 0.031 0.039 0.000 0.002 0.008 0.007 0.012 0.118 0.087 0.098 0.118 0.059 0.071 0.016 0.014 0.018
Copyright ANPEC Electronics Corp. Rev. Aug., 2006
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APW7134
Carrier Tape Reel Dimensions
Application
12.3
54.4 13.0
1.75
DFN-10
0.05
0.05
0.05
(mm)
Cover Tape Dimensions
Application DFN-10 Carrier Width Cover Tape Width Devices Reel 3000
Copyright ANPEC Electronics Corp. Rev. Aug., 2006
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APW7134
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)
Ramp-up
Critical Zone
Temperature
Tsmax
Tsmin Ramp-down Preheat
Peak
Classificatin 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/Classificatioon 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 Notes: temperatures refer topside package .Measured body surface.
Copyright ANPEC Electronics Corp. Rev. Aug., 2006 www.anpec.com.tw
APW7134
Classificatin Reflow Profiles(Cont.)
Table SnPb Entectic Process Package Peak Reflow Temperatures Package Thickness Volum Volume <350 <2.5 +0/-5°C +0/-5°C +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.
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. Aug., 2006
www.anpec.com.tw
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