Step-Up Converter Combo Features Built-In 500mA Synchronous

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Step-Up Converter Combo Features Built-In 500mA Synchronous

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APW7075
Step-Up Converter Combo
Features
Built-In 500mA Synchronous Step-Up DC-DC Converter Built-In PWM/PFM Operating Mode Provided Dual Input Power Sources Connect 3.3V Output Voltage 2.5V Output Voltage External Resistor Divider Adjustable Output Voltage.
General Description
APW7075 PWM/PFM, high-efficiency step-up DC-DC converter with integrated input switch dual mode application. During battery mode operation, APW7075 acts synchronous rectifier step-up DC-DC converter with fixed adjustable output voltage. When sense input voltage, APW7075 switched operation mode, maintaining constant output voltage. input voltage ranges from 4.5V stepup DC-DC converter. start-up guaranteed at1V device operating down 0.6V. When device operating mode, suitable output voltage 3.3V loading current 500mA maximum power consumption guaranteed. APW7075 suited dual mode portable battery powered appliance with low-battery detector. dual-mode applications, APW7075 draws power from available connection reverts battery power when power removed.
Fixed 300KHz Operating Frequency High Efficiency 200mA Output Current 0.6V 4.5V Operating Voltage Start Input Voltage Battery Voltage Detection Reverse Voltage Protection Internal Synchronous Rectifier Automatic Detection Input Voltage Compact SOP-8-P TSSOP-8 Packages Lead Free Available (RoHS Compliant)
Applications
Dual Mode Power System Peripheral Camcorders Digital Camera Hand-held Instrument PDAs
Description
TSSOP-8 View
SHDN
SOP-8-P View
SHDN
Thermal (connected plane better heat dissipation)
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., 2005 www.anpec.com.tw
APW7075
Ordering Marking Information
APW7075 Lead Free Code Handling Code Temp. Range Package Code APW7075 APW7075 APW7075 XXXXX APW7075 XXXXX Package Code SOP-8-P TSSOP-8 Temp. Range Handling Code Tube Tape Reel Lead Free Code Lead Free Device Blank Original Device XXXXX Date Code 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
SHDN
Current Limit Vref P-MOS Vref P-MOS phase compensation
VOUT R1,R2
PWM/ controller Drive Oscillator N-MOS voltage reference soft-start Vref SHDN
N-MOS
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APW7075
Absolute Maximum Ratings
Symbol VOUT TSTG Parameter Supply voltage(OUT GND) Input output pins Operating Ambient Temperature Range Junction Temperature Range Storage Temperature Range Soldering Temperature Value -0.3 -0.3 +150 300, seconds Unit
Thermal Characteristics
Symbol Parameter Thermal Resistance Junction Ambient SOP-8 SOP-8-P TSSOP-8 Value Unit °C/W
Electrical Characteristics
VBAT (VOUT 3.3V), +85°C, unless otherwise noted. Typical values +25°C.
Symbol
Parameter
Test Conditions
APW7075 Min. Typ. Max.
Unit
Step-up section Minimum Operating Input VBAT Voltage (Note1) Operating Voltage Start-up Voltage DMAX Operating Frequency Maximum Duty Cycle VOUT 3.3VX96% VOUT 3.3VX96% 100mA 100mA
Power MOSFET RDS(on)-N Active Switch Resistance Synchronous Switch RDS(ON)-P Resistance Control Output Voltage Output Voltage Range
OUT, ILOAD GND, ILOAD External divider
3.234 2.45
3.366 2.55
VOUT
VOUT(drop) VOUT Dropping Voltage (Note VOUT 3.3V, 100µF
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APW7075
Electrical Characteristics (Cont.)
Unless otherwise noted these specifications apply over full temperature, 3.9VVIN<5.5V, OUT10µF, SHDN=VIN ,Typical values TA=+25°C.)
Symbol VREF ISHDN SHDN
Parameter Soft-start Time Input Threshold Input Current Shutdown Current SHDN Input Current Logic (VIL) Logic HIGH(VIH) Input Hysteresis Threshold Input Current Logic
Test Conditions VOUT 3.3V ILOAD 1.4V VSHDN VSHDN VOUT
APW7075 Min. Typ. 1.176 0.03 0.07 0.588 0.07 0.612 Max. 1.224
Unit
Operating Current (Note3) VOUT 3.3VX96%, ILOAD
VLBI ILBI VLBO ILBO
VLBI 0.8V VLBI ISINk
Leakage Current VLBO 5.5V, VLBI 5.5V Upper Threshold increasing Voltage Lower Threshold decreasing Voltage Threshold Hysteresis Output Voltage Current Limit Short Current Load Current Dropout Voltage Quiescent Current ILOAD 500mA load ILOAD 500mA 4V<VIN<5.5V, ILOAD 0mA<ILOAD<500mA VOUT
Section (Note4) VIN(upper) VIN(lower) VOUT ILIM ISHORT IOUT VDROP 3.75 3.65 VOUT-2 VOUT 1000 VOUT+2 4.05 3.95
REGLINE Line Regulation REGLOAD Load Regulation
Note1: min. operating voltage dependent duty cycle. Note2: dropped output voltage that input power (VIN pin) switched battery power pin), when power removed. Note3: Device boostrapped power comes from OUT). This correlates directly with actual battery supply. Note4: mode used, output voltage should under 3.8V.
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APW7075
Function Description
(Pin Input supply voltage dual-mode application. Connect schokkty diode (current rating >500mA) port adapter. mode used, ground. (pin Internal 1.2V reference voltage. Connect output,. Connect 2.5V output. resistor divider output voltage from 2.5V 5.5V. SHDN (pin Shutdown input. High operating mode; shutdown mode. (Pin Low-battery comparator input. Internally trip 0.6V. (pin Open-drain battery comparator output. Connect through 100K resistor. Output VLBI 0.6V. Open-drain device turned during shutdown. (pin Power output. provides bootstrap power (Pin Ground pins circuitry ground pins must soldered with proper power dissipation. (pin N-channel P-channel power MOSFET drain connection.
Application Schematic
VBAT
10uF 22UH
1N5817
Adapter 10uF
VOUT 3.3V SHDN
100k 100uF
APW7075
Battery Output
Connect R6=500 Figure Dual Model 3.3V Output Voltage
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APW7075
Application Schematic (Cont.)
VBAT
10uF 22UH
1N5817
Adapter 10uF
VOUT 2.5V
100k 100uF
SHDN
APW7075
Battery Output
Connect R6=500 Figure Dual Model 2.5V Output Voltage
VBAT
22UH
1N5817
10uF
2.5V VOUT 3.8V Adapter 10uF
300k
VOUT 3.6V
100k 100uF
SHDN
150k
APW7075 Battery Output
Connect R6=500 Figure Dual Model: Adjustable Output Voltage
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APW7075
Application Schematic (Cont.)
0.6V VBAT
10uF 22UH
VBAT 4.5V
2.5V
300k
VOUT 3.6V
VOUT
100k
SHDN
150k
100uF
APW7075 Battery Output
Figure Single Boost Converter
Typical Characteristics
Power (VBATTERY=2.4V)
IOUT=100mA
Power (VBATTERY=1.2V)
VBAT(1V/div) IOUT=100mA
VBAT(1V/div) VOUT(1V/div)
VOUT(1V/div) LX(2V/div) LX(2V/div)
Time(10ms/div)
Time(10ms/div)
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APW7075
Typical Characteristics (Cont.)
Power Down
IOUT=100mA VBAT(2V/div) SHDN(1V/div)
Enable
IOUT=100mA
VOUT(1V/div)
VOUT(1V/div) LX(2V/div) LX(2V/div)
Time(5ms/div)
Time(10ms/div)
Shutdown
IOUT=100mA SHDN(1V/div)
Heavy Load Operating Waveforms
IL(200mA/div)
IOUT=100mA, VOUT=3.3V VBAT=2.4V, CBAT=10µF COUT=100µF, L=22µH
VOUT(1V/div)
LX(2V/div) LX(2V/div) LOUT(100mV/div)
Time(1ms/div)
Time(1us/div)
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APW7075
Typical Characteristics (Cont.)
Light Load Operating Waveforms
Output Current Start-up Voltage
Start-up Voltage(V)
IL(200mA/div) IOUT=30mA, VOUT=3.3V VBAT=2.4V, CBAT=10µF COUT=100µF, L=22µH
LX(2V/div)
LOUT(100mV/div)
Time(5us/div)
Output Current(mA)
Effciency Output Current
Effciency Output Current
VIN=2.4V
Effciency(%)
VIN=1.2V
0.01
Effciency(%)
VOUT=2.5V, L=22µH VIN=1.2V
VOUT=3.3V, L=22µH
0.01 1000
1000
Output Current(mA)
Output Current(mA)
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APW7075
Typical Characteristics (Cont.)
Efficiency Output Current
VIN=2.4V
Efficiency Output Current
Efficiency(%)
Efficiency(%)
0.01
0.01
VOUT=2.5V, L=10µH VIN=1.2V
VIN=1.2V
VOUT=3.3V, L=10µH
1000
1000
Output Current(mA)
Output Current(mA)
Maximum Output Current vs.Input Voltage
1000
Operating Curretnt into Output Voltage
Maximum Output Current (mA)
L=22µH VOUT=3.3V VOUT=3.6V
Operating Current into OUT(mA)
FB=1.4V
VOUT=2.5V
VOUT=5V
Input Voltage(V)
Output Voltage(V)
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APW7075
Typical Characteristics (Cont.)
Transition from Input Voltage transition from PWM(mA)
L=10µH
Transition from Input Voltage transition from PWM(mA)
L=22µH
VOUT=3.3V VOUT=3.6V
VOUT=2.5V VOUT=5V
VOUT=2.5V
VOUT=3.3V
VOUT=3.6V VOUT=5V
Input Voltage(V)
Input Voltage(V)
Input Battery Current Input Battery Voltage
Line Transient Response
VBAT(2V/div)
Input Battery Current(µA)
IOUT= 100mA, VOUT=3.3V VBAT=2V~3V VOUT=3.3V
VOUT=2.4V VOUT(200mV/div)
Input Battery Voltage(V)
Time(2ms/div)
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APW7075
Typical Characteristics (Cont.)
Load Transient Response
(2V/div) VOUT(200mV/div) IOUT=100mA, VOUT=3.3V CIN=10µF, VBAT=2.4V
VBAT=2.4V, VOUT=3.3V L=22µH
VOUT(100mV/div) IOUT=10~300mA LX(2V/div)
Time(0.5ms/div)
Time(50us/div)
Power
(2V/div) IOUT=100mA, VOUT=3.3V CIN=10µF, VBAT=2.4V (2V/div)
IOUT=100mA
VOUT(100mV/div) VOUT(2V/div)
LX(2V/div)
IIN(1A/div)
Time(0.2ms/div)
Time(10ms/div)
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APW7075
Typical Characteristics (Cont.)
Power Down
IOUT=100mA VIN(20V/div)
Load Transient Response
VOUT(50mV/div)
VOUT(2V/div)
VIN=5V, VOUT=3.
IOUT=10mA~500mA IN(1A/div)
Time(10ms/div)
Time(5us/div)
Load Transient Response
Rising Delay Time
VOUT(50mV/div) VBAT=2.4V, VOUT=3.3V VIN=5V, VOUT=3. LBI(0.5V/div)
IOUT=10mA~500mA
LBO(2V/div)
Time(5us/div)
Time(5us/div)
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APW7075
Typical Characteristics (Cont.)
Falling Delay Time
Output Sink Current Voltage
VOUT=3.3V LBI(0.5V/div)
Sink Current(mA)
VBAT=2.4V, VOUT=3.3V
LBO(2V/div)
0.25 0.75 1.25
Time(5us/div)
Output Voltage(V)
Current Limit Input Voltage
Quiescent Current Input Voltage
Quiescent Current
Current Limit(A)
IOUT=10mA
IOUT=0mA
Input Voltage(V)
Input Voltage(V)
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APW7075
Typical Characteristics (Cont.)
Quiescent Current Output Current
Dropout Voltage Output Current
VOUT=4.2V
Quiescent Current (mA)
Dropout Voltage (mV)
Output Current(mA)
Output Current(mA)
Output Voltage Input Voltage
3.303 Iout=0mA 3.302
Output Voltage Temperature
IOUT=0mA
3.295
Output Voltage
Output Voltage
3.301 3.299 3.298 3.297
3.29
3.285
3.28
3.275
3.27
Input Voltage(V)
Temperature
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APW7075
Function Description
Control Scheme APW7075 features control scheme improve efficiency during light load. mode, inductor stores energy during internal N-channel MOSFET turns energy transferred output capacitors load during internal P-channel MOSFET turns energy which charged output capacitors exceeds requirement load, current will reverse from output capacitors inductor input capacitors. comparator compares source (OUT) drain (LX) internal P-channel MOSFET. When current that flows through internal P-channel MOSFET backward (from LX), internal P-channel MOSFET will turned off, output capacitor supplies load maintains output voltage. During mode, switches only need serve load, reducing switching frequency associated losses internal switches external inductor. Some jitter normal during transition from mode; transition dependent inductance values, VIN, VOUT. output ripple higher during operation, larger output capacitor used minimize output ripple. Synchronous Rectification APW7075 internal N-channel P-channel MOSFET, need external components, internal RDS(ON) P-channel MOSFET replaces discrete Schottky diode, reducing cost board space. During cycle time, P-channel MOSFET turns power
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dissipation P-channel MOSFET lower than discrete Schottky diode, thus conversion efficiency improved. Shutdown APW7075 active high enable function. Force SHDN high (>1.4V) enable step-up converter, SHDN (<0.3V) disable step-up converter device enters shutdown mode. shutdown mode, converter stops switching internal control circuits turned off, output still applied input voltage through body diode Pchannel MOSFET, about Vin-0.6V. Note that when output applied from (LDO mode), shutdown function disabled. Soft Start APW7075 provides soft-start function controlled output voltage rise. When battery voltage (<1.8V) supplied device exceeds start-up voltage, internal N-channel P-channel MOSFETs start switch pump output voltage 1.8V( battery voltage over 1.8V, output voltage will equal battery voltage during this time which control circuitry operate normally soft start controls rise internal reference voltage, when internal reference voltage exceeds feedback voltage which divided resistor from output voltage, soft-start circuit will control output voltage until output voltage regulation. soft-start interval approximately 30ms.
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APW7075
Function Description (Cont.)
output voltage operation modes. When exceeds 3.9V, output will become regulator step-up converter will disabled. output P-channel dropout regulator with current limit. When below 3.8V, output will return step-up converter, mode will disabled. Note that when mode used, output voltage should under 3.8V Battery Detection battery detection used monitor battery voltage generate signal. This function includes pins, inverting input comparator open drain output (see block diagram). When voltage drops below threshold voltage 0.6V, open drain device will turn becomes low. battery threshold voltage programmed with resistive divider from battery ground. Since open drain output, usually requires external pull-up resistor. Inductor Selection APW7075 works well with 22uH inductor most applications. inductance values determine inductor ripple current affect output current. Higher inductance values reduce ripple improve efficiency. Lower inductance values have fast response increase ripple reduce efficiency. maximum allowed current (the maximun. output current shows Typical Characteristics) peak inductor current cannot exceed following equations calculate inductor current, output voltage APW7075 adjusted external resistor divider, connect 3.3V ground 2.5V (see Application Schematic). internal reference voltage 1.2V allowed output voltage from 2.5V 5.5V. following equation used calculate output voltage:
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1.2V
Programming Battery Threshold Voltage battery threshold voltage programmed with resistive divider from battery ground (see Application Schematic). internal reference voltage 0.6V, battery threshold voltage must below battery voltage. following equation used calculate battery threshold voltage:
VBAT
0.6V
Application Information
Output Voltage Selection
output current. IOUT (1-D)
(VOUT- VIN)
Where:
VOUT -VIN VOUT
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APW7075
Function Description (Cont.)
Inductor Selection (Cont.) inductor' resistance affects efficiency; larger resistance dissipates more power, should small possible. important choose inductor' saturation current rating greater than peak current which inductor will flow application. Boost Converter Input Capacitor Selection least 10uF input capacitor recommended stabilize battery voltage minimize peak current ripple from battery. Input Capacitor Selection input capacitor with larger values lower ESRs provide better PSRR line transient response. least 10uF capacitor recommended.
10uF 100uF
Layout Considerations correct layout important switching converters. layout carefully done, regulator could show stability problems well problems. Figure. illustrates layout guidelines, bold lines indicate high current paths; these traces must short wide. input capacitors, output capacitors, inductor should close possible. common ground plane power ground different control ground minimize effects ground noise. Connect these ground planes node close feedback resistor dividers should placed close possible.
Output Capacitor Selection output capacitor used supplying output during internal N-channel MOSFET turns time. Larger capacitance lower reduce output voltage ripple. output voltage supplies power output voltage ripple must small possible provide better PSRR. general, 100uF 220uF Tantalum capacitor recommended, ceramic capacitor parallel bypassing noise also recommended. following equation calculates output ripple.
Voripple= VOUT VBAT ESR) VOUT
SHDN
VOUT
10uF 22UH
VBAT
APW7075
Figure Recommended Layout Diagram
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APW7075
Packaging Information
SOP-8-P Reference JEDEC Registration MS-012)
0.004max.
Millimeters Min. 1.35 4.80 3.00REF 3.80 2.60REF 5.80 0.40 0.33 1.27BSC 6.20 1.27 0.51 0.228 0.016 0.013 4.00 0.150 Max. 1.75 0.15 5.00 Min. 0.053 0.189
0.015X45
Inches Max. 0.069 0.006 0.197 0.118REF 0.157 0.102REF 0.244 0.050 0.020 0.50BSC
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APW7075
Packaging Information
TSSOP-8
GAUGE PLANE
0.25
(L1)
Millimeters Min. 0.00 0.80 0.19 0.65 6.40 4.30 0.45 0.09 0.09
Inches Max. 0.15 1.05 0.30 Min. 0.000 0.031 0.007 0.114 0.026 0.252 4.50 0.75 0.169 0.018 0.039REF 0.004 0.004 0.008
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Max. 0.047 0.006 0.041 0.012 0.122
0.177 0.030
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APW7075
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
Peak
Time
Classification Reflow Profiles
Profile Feature Average ramp-up rate Preheat Temperature (Tsmin) Temperature (Tsmax) Time (min max) (ts) Time maintained above: Temperature 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.
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APW7075
Classification Reflow Profiles(Cont.)
Table SnPb Entectic Process Package Peak Reflow Temperature Package Thickness Volume 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
Carrier Tape Reel Dimensions
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APW7075
Carrier Tape Reel Dimensions(Cont.)
Application Application +1.5 12.75+ 0.15 12.4 12.4 1.75±0.1
1.55 +0.1 1.55+ 0.25 +1.5 12.75+ 0.15
±0.013 1.75±0.1
±0.013
(mm)
Cover Tape Dimensions
Application SOP-8-P TSSOP-8 Carrier Width Cover Tape Width Devices Reel 2500 2500
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
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Step-Up Converter Combo Features Built-In 500mA Synchronous

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