White DC/DC Step-Up Converter 2.4V Input Voltage Range 400mA, Int
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APW7071
White DC/DC Step-Up Converter
2.4V Input Voltage Range 400mA, Internal Switch Current 1MHz Switching Frequency 70µA Typical Load Quiescent Current 0.1µA Typical Shutdown Current Internal Soft-start Available Tiny 6-Pin SOT-23 Package efficiency Operating Output Capacitor down 0.1µF Over Voltage Protection included Lead Free Available (RoHS Compliant)
General Description
APW7071 high frequency step DC/DC converter small leads SOT-23 package specially designed drive white LEDs with constant current. device drive LEDS series from Li-Ion cell. APW7071 ideal panels requiring current high efficiency well white applications cellular phone backlighting.
Package
SHDN
Applications
Cellar Phones White Back Light PDAs, Handheld Computers Digital Still Cameras Players Receivers
SOT-23-6 (Top View) APW7071
Ordering Marking Information
APW7071
Lead Free Code Handling Code Temp. Range Package Code Package Code SOT-23-6 Operating Junction Temp. Range 85°C Handling Code Tube Tape Reel Lead Free Code Lead Free Device Blank Original Device XXXXX Date Code
APW7071
W71X
Notes: 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.
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. Feb., 2006 www.anpec.com.tw
APW7071
Block Diagram
OVP(5)
VIN(6) 400ns Min. off-time Error Comparator FB(3)
Under Voltage Lockout
Thermal Shutdown
SW(1)
Vref=0.25V
Control Logic
Gate Driver
N-MOSFET
Max. on-time
Current Limit RSENSE
SHDN(4)
Soft start GND(2)
Description
Name SHDN Function Switch Pin. Connect inductor/diode here. Minimize trace area this educe EMI. Ground Pin. Feedback Pin. Reference voltage 0.25V. Connect cathode lowest resistor here. Calculate resistor value according 0.25V/l Shutdown Pin. 1.3V higher enable device, 0.4V less disable. Over voltage protection sense pin. Connect this VOUT over voltage protection. Supply voltage Pin.
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
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APW7071
Absolute Maximum Ratings
Symbol SHDN TSTG Parameter Supply voltage Feedback Voltage Shutdown Voltage Switch Voltage Junction Temperature Range Storage Temperature Range Rating +150 Unit
Recommend Operating Conditions
Symbol Cout Parameter Input supply voltage Switch voltage Inductor Input capacitor Output capacitor Operating ambient temperature Operating junction temperature Min. Value Typ. Max. Unit
Electrical Characteristics
VIN=2.4V, EN=VIN, TA=-40°C +85°C, typical values TA=+25°C (unless otherwise noted)
Symbol Parameter Test Condition Min. Iout=0, switching, VFB=0.3V SHDN=GND SHDN=GND 1000 APW7071 Typ. Max. Unit
Supply Voltage Current Input Voltage Range UVLO Operating quiescent current Shutdown current Under-Voltage Lockout threshold Under-Voltage Lockout hysteresis
ENABLE SHDN high level input voltage SHDN level input voltage SHDN input leakage current Power Switch Current limit Maximum switching voltage toff Minimum off-time Maximum on-time Rds,on ILIM MOSFET on-resistance MOSFET leakage current MOSFET current limit
Vin=2.4V, Isw=200mA Vsw=20V
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
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APW7071
Electrical Characteristics (Cont.)
Symbol OUTPUT Vout Parameter Test Condition Min. 0.237 0.25 APW7071 Typ. Max. 0.263 Unit
Adjustable output voltage range Feedback input bias current VFB=0.3V 2.4VIN6.0V Feedback trip point voltage threshold hysteresis
Typical Application Circuit
2.7V~6V 4.7µF
4.7µH
MSCD052
Vout
2.4V~6V
10µH
MSCD052
Vout
0.1µF
4.7µF
SHDN
SHDN
Fig.1 Typical 4LED application
Fig.2 4LED application with lower output voltage ripple
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
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APW7071
Typical Characteristics
(Circuit Figure 3.3V, ILED 15mA, 4.7µH, 4.7µF, COUT 0.1µF,4 LEDs, +25°C, unless otherwise noted.)
Efficiency Current
Vin=3.6V
Efficiency Supply Voltage
Vin=4.2V
Efficiency(%)
ILED=15mA
Efficiency(%)
Vin=2.7V
Current(mA)
Supply Voltage(V)
Switch Rds,on Supply Voltage
Switch Rds,on Temperature
Rds,on()
Rds,on()
Ta=25°C
Vin=3.3V
Supply Voltage(V)
Temperature(°C)
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
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APW7071
Typical Characteristics (Cont.)
Non-Switch Quiescent Current Supply Voltage
Non-Switch Quiescent Current Temperature
Non-Switch Quiescent Current(µA)
Non-Switch Quiescent Current(µA)
Vin=3.3V
Ta=25°C
Supply Voltage(V)
Temperature(°C)
Current Supply Voltage
Start-up Waveform
SHDN 2V/DIV VOUT 5V/DIV
Current(mA)
L=4.7µH Cout=0.1µF 4LED
Input Current 100mA/DIV
Supply Voltage(V)
ms/DIV
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
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APW7071
Typical Characteristics (Cont.)
Waveform
Operation
VOUT(AC) 200mV/DIV VOUT 5V/DIV
10V/DIV 100mV/DIV
ms/DIV
µs/DIV
Burst Mode Operation
VOUT(AC) 200mV/DIV
10V/DIV 100mV/DIV
µs/DIV
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
www.anpec.com.tw
APW7071
Function Descriptions
OPERATION APW7071 operates pulse frequency modulation (PFM) scheme with constant peak current control.The operation understood referring block diagram Figure converter monitors output voltage, feedback voltage falls below reference voltage (typical 0.25V), internal switch turns inductor current ramps switch turns inductor current reaches internally peak current (typical 400mA) maximum on-time detected. switch turned off, inductor current ramps down zero charge output capacitor through external Schottky diode. switch remains minimum (typical), until feedback voltage drops below reference voltage again. operation frequency 1MHz determined output current, current limit, inductor value, input voltage output voltage. This regulation scheme inherently stable, allowing wider selection range inductor output capacitor. Enable Force SHDN greater than enable device works normal operation. Pulling SHDN less than 0.4V shut down reducing shutdown current (typical). SHDN should left floating. Soft Start APW7071 limits this inrush current increasing current limit start-up. Under Voltage Lockout Transients during powering instantaneous glitches supply voltage cause system damage failure. undervoltage lockout circuit turned main switch prevent malfunction input voltage.
Copyright ANPEC Electronics Corp. Rev. Feb., 2006 www.anpec.com.tw
Over Voltage Protection (OVP) integrated prevent output voltage increase over maximum switching voltage rating. some cases fail, this will result feedback voltage always being zero. device will boost output voltage higher higher. When output voltage exceeds threshold voltage (typical 17V), switch turns off. converter switch remains until output voltage falls below threshold voltage. Thermal Shutdown thermal shutdown function integrated shutdown device when junction temperature exceed 160°C. thermal shutdown detected, converter switch turn until junction temperature falls bellow 120°C.
APW7071
Application Information
Setup current current controlled reference voltage resistor shows Figure current through LEDs given 250mV/R1. Brigtness control adjustable voltage Uses voltage control feedback voltage. voltage increases, current starts flowing down loop will continue regulate feedback voltage 250mV. Thus current decrease through LEDs same amount current being injected from voltage source. With from resistor values shown control current from 20mA.
2.7V~6V 4.7µF 4.7µH 0.1µF
2.7V~6V 4.7µF
4.7µH
MSCD052
Vout
0.1µF
100Hz~300Hz brightness control
SHDN
Duty=100%, LED=20mA Duty=0%,
Fig. Brightness Control signal apply SHDN
filtered signal Brightness achieved filtered signal. signal above 5KHz recommended.
2.7V~6V 4.7µF 4.7µH 0.1µF MSCD052 Vout
MSCD052
Vout
SHDN
120K
SHDN
120K
0.1uF
Vadj=3.3V, Vadj=0V, LED=20mA
3.3V brightness control Duty=100%, Duty=0%, LED=20mA
Fig. Brightness Control adjustable voltage
Fig. Brightness Control
filtered signal
signal apply SHDN signal applied SHDN APW7071. LEDs will switch between full load completely shut off. average current through LEDs will increase proportionally duty cycle signal. soft start function, signal should 100Hz 300Hz.
Copyright ANPEC Electronics Corp. Rev. Feb., 2006 www.anpec.com.tw
APW7071
Application Information (Cont.)
Inductor selection Since peak current control scheme inherently stable, inductor value does affect stability regulator. selection inductor together with nominal load current, internal peak current, input output voltage application determines switching frequency converter. application, inductor values between recommended. Recommended inductors
Part LQH32CN4R7M23L LQH32CN100K53L SH30184R7YSB SH3018100YSB Value(µH) Vendor Murata Murata
Part Value Vender GRM188R60J475KE19D 4.7µF/X5R/ Murata 0603/6.3V GRM219R60J106KE19D 10µF/X5R/ Murata 0805/6.3V
Recommended output capacitor
Part Value GRM185R61C105KE44D 1.0µF/X5R/ 0603/16V 0.22µF 0.1µF Vender Murata
Input capacitor selection good input voltage filtering, ceramic capacitors recommended. 4.7µF ceramic input capacitor sufficient most applications. better input voltage filtering capacitor value increased. Recommended input capacitor
Output capacitor selection better output voltage filtering, output capacitor recommended. Ceramic capacitors have value, depending application, tantalum capacitors used. selection output capacitor value directly influences output voltage ripple converter which also influences line regulation. larger output voltage ripple, larger line regulation, which means that current changes input voltage changes. certain change current gives noticeable change brightness, depends manufacturer application. Applications requiring good line regulation ±1%/V (typ) must output capacitor values eqµAl large than Diode selection achieve high efficiency Schottky diode must used. current rating diode must meet peak current rating converter. Recommended diode
Part MSCD052 Reverse Voltage Vender Zowie
Layout considerations Typical switching power supplies, layout important step design; especially high peak currents switching frequencies. layout carefully done, regulator might show noise problems duty cycle jitter. input capacitor should placed close possible input good input voltage filtering. inductor diode should placed close possible switch
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Copyright ANPEC Electronics Corp. Rev. Feb., 2006
APW7071
Application Information (Cont.)
Layout considerations (Conts.)() minimize noise coupling into other circuits. Since feedback network high impedance circuit, feedback network should routed away from inductor. feedback feedback network should shielded with ground plane trace minimize noise coupling into this circuit.
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
www.anpec.com.tw
APW7071
Package Information
SOT-23-6
Millimeters Min. 1.00 0.00 0.70 0.35 2.70 1.40 1.90 2.60 0.30 0.08 0.60 0.85 1.05 3.00 0.25 Max. 1.45 0.15 1.25 0.55 3.10 1.80
Inches Min. Max. 0.0394 0.0571 0.0000 0.0591 0.0276 0.0492 0.0138 0.0217 0.1063 0.1220 0.50551 0.0709 0.07480 0.1024 0.1181 000118 0.0031 0.0098 0.024 0.0335 0.0413
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
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APW7071
Physical Specifications
Terminal Material Lead Solderability Solder-Plated Copper (Solder Material 90/10 63/37 SnPb) 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
Classificatin 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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Copyright ANPEC Electronics Corp. Rev. Feb., 2006
APW7071
Classificatin 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 Hrs, 121°C -65°C 150°C, Cycles VHBM 2KV, 200V 10ms 100mA
Carrier Tape
Copyright ANPEC Electronics Corp. Rev. Feb., 2006
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APW7071
Carrier Tape(Cont.)
Application
1.5±
3.2±
1.4±
1.75± 0.2±0.033 (mm)
13.0 0.15 1.5±
SOT-23-5/6
0.05
3.15
Cover Tape Dimensions
Application SOT- 23-5/6 Carrier Width Cover Tape Width Devices Reel 3000
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. Feb., 2006
www.anpec.com.tw
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