1MHz, High-Efficiency, Step-Up Converter White LEDs Wide Input Vo

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1MHz, High-Efficiency, Step-Up Converter White LEDs Wide Input Vo

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APW7136A/B/C
1MHz, High-Efficiency, Step-Up Converter White LEDs
Wide Input Voltage from 2.7V 0.25V Reference Voltage Fixed 1MHz Switching Frequency High Efficiency 100Hz 100KHz brightness control frequency Open-LED Protection Under Voltage Lockout Protection Over Temperature Protection <1µA Quiescent Current during Shutdown SOT-23-6 Package Lead Free Available (RoHS Compliant)
General Description
APW7136A/B/C current-mode fixed frequency boost converter with integrated N-FET drive white LEDs series. series connection allows current identical uniform brightness. on-resistance NFET feedback voltage reduce power loss achieves high efficiency. Fast 1MHz current-mode operation available input output capacitors small inductor while minimizing ripple input supply. monitors output voltage stop switching exceeds over-voltage threshold. internal soft-start circuit eliminates inrush current during start-up. 7136A/B/C also integrates under-voltage lockout, over-temperature protection current limit circuits. APW7136/A/B/C available SOT-23-6 package.
Applications
White Display Backlighting Cell Phone Smart Phone PDA, PMP, Digital Camera
Simplified Application Circuit
4.7µF 22µH
VOUT
Configuration
SOT-23-6 View
WLEDs
Ordering Marking Information
APW7136 Lead Free Code Handling Code Temperature Range Package Code Voltage Code
Voltage Code Date Code
Voltage Code Package Code SOT-23-6 Operating Ambient Temperature Range 85oC Handling Code Tape Reel Lead Free Code Lead Free Device
APW7136YCI
CFYX
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.
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. Jan., 2008 www.anpec.com.tw
APW7136A/B/C
Absolute Maximum Ratings
Symbol Supply Voltage (VIN GND) Voltage VOVP TSTG TSDR Voltage Voltage Maximum Junction Temperature Storage Temperature Range Maximum Lead Soldering Temperature, seconds
(Note
Rating -0.3 -0.3 -0.3 -0.3 Unit
Parameter
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 (Note
Symbol Parameter Junction Ambient Thermal Resistance SOT-23-6 Rating Unit °C/W
Note measured with component mounted high effective thermal conductivity test board free air. exposed package soldered directly PCB.
Recommended Operating Conditions (Note
Symbol VOUT COUT Input Voltage Converter Output Voltage Input Capacitor Output Capacitor Inductor Ambient Temperature Junction Temperature Parameter Range 2.7~ higher 0.68 higher Unit
Note Refer application circuit further information.
Electrical Characteristics
(Refer Figure "Typical Application Circuits". These specifications apply over 3.6V, -40°C 85°C, unless otherwise noted. Typical values 25°C.)
Symbol Parameter Test Condition APW7136A/B/C Min. Typ. Max. Unit
SUPPLY VOLTAGE CURRENT IDD1 IDD2 UNDER VOLTAGE LOCKOUT UVLO Threshold Voltage UVLO Hysteresis Voltage Rising Input bias current Input Voltage Range 85°C, 125°C 1.3V, switching GND, switching
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Electrical Characteristics (Cont.)
(Refer Figure "Typical Application Circuits". These specifications apply over 3.6V, -40°C 85°C, unless otherwise noted. Typical values 25°C.)
Symbol Parameter Test Condition APW7136A/B/C Min. Typ. Max. Unit
REFERENCE OUTPUT VOLTAGES VREF ILIM DMAX Regulated Feedback Voltage Input Current 25°C 85°C 125°C)
INTERNAL POWER SWITCH Switching Frequency Power Switch Resistance Power Switch Current Limit Leakage Current Maximum Duty Cycle VEN=0V, VLX=0V FB=GND
OUTPUT OVER VOLTAGE PROTECTION APW7136A VOVP Over Voltage Threshold APW7136B APW7136C Hysteresis Leakage Current ENABLE SHUTDOWN VTEN ILEN TOTP Voltage Threshold Voltage Hysteresis Leakage Current VEN= 0~5V, Rising Rising VOVP =30V, EN=VIN
OVER-TEMPERATURE PROTECTION Over-Temperature Protection Over-Temperature Protection Hysteresis
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Typical Operating Characteristics
(Refer Figure section "Typical Application Circuits", VIN=3.6V, TA=25oC, 8WLEDs unless otherwise specified)
Efficiency WLED Current
Efficiency WLED Current
Efficiency
VIN=3.3V VIN=3.6V WLEDs 25.6V@20mA =POUT/PIN VIN=5V VIN=4.2V
Efficiency
VIN=3.6V VIN=3.3V WLEDs 19.3V@20mA =POUT/PIN VIN=4.2V VIN=5V
WLED Current, ILED (mA)
WLED Current, ILED (mA)
Efficiency WLED Current
WLED Current Duty Cycle
WLED Current, ILED (mA)
100Hz 1KHz 100KHz
Efficiency
VIN=3.6V VIN=3.3V WLEDs VIN=4.2V VIN=5V
13V@20mA
=POUT/PIN
Supply Voltage,
Duty Cycle
WLED Current Supply Voltage
21.0
Switch Resistance Supply Voltage
WLED Current, ILED (mA)
20.6 20.4 20.2 20.0 19.8 19.6 19.4 19.2 19.0
Switch Resistance,
20.8
Supply Voltage,
Supply Voltage,
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Typical Operating Characteristics
(Refer Figure section "Typical Application Circuits", VIN=3.6V, TA=25oC, 8WLEDs unless otherwise specified)
Switching Frequency Supply Voltage
Maximum Duty Cycle Supply Voltage
Switching Frequency, (MHz)
Maximum Duty Cycle, DMAX
Supply Voltage,
Supply Voltage,
Operating Waveforms
(Refer application circuit section "Typical Application Circuits", VIN=3.6V, TA=25oC, 8WLEDs unless otherwise specified
Start-up
VOUT
Start-up
VOUT
IIN, 0.1A/Div
IIN, 0.1A/Div
8WLEDs, L=22µH, VIN=3.6V, ILED=20mA CH1: VEN, 2V/Div, CH2: VIN, 2V/Div, CH3: VOUT, 10V/Div, CH4: 0.1A/Div, Time: 1ms/Div
6WLEDs, L=22µH, VIN=3.6V, ILED=20mA CH1: VEN, 2V/Div, CH2: VIN, 2V/Div, CH3: VOUT, 10V/Div, CH4: 0.1A/Div, Time: 1ms/Div
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Operating Waveforms (Cont.)
(Refer application circuit section "Typical Application Circuits", VIN=3.6V, TA=25oC, 8WLEDs unless otherwise specified
Start-up
VOUT
Open-LED Protection
VOUT,10V/Div
IIN, 0.1A/Div 4WLEDs, L=22µH, VIN=3.6V, ILED=20mA CH1: VEN, 2V/Div, CH2: VIN, 2V/Div, CH3: VOUT, 10V/Div, CH4: 0.1A/Div, Time: 1ms/Div
CH1: VOUT, 10V/Div, Time: 20ms/Div APW7136C
Normal Operating Waveform
VLX, 20V/Div,
VOUT,50mV/Div,AC
CH1: VLX, 20V/Div, CH2: VOUT, 50V/Div, CH3: 0.1A/Div, Time: 1µs/Div
0.1A/Div 8WLEDs, L=22µH, VIN=3.6V, ILED=20mA
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Descriptions
Name Function Description Switch pin. Connect this inductor/diode here. Power signal ground pin. Feedback Pin. Reference voltage 0.25V. Connect this cathode lowest resistor (R1). Calculate resistor value according R1=0.25V/ILED. Enable Control Input. Forcing this above 1.0V enables device, forcing this below 0.4V shut down. shutdown, functions disabled decrease supply current below 1µA. leave this floating. Over Voltage Protection Input Pin. connected output capacitor converter. Main Supply Pin. Must closely decoupled with 4.7µF greater ceramic capacitor.
Block Diagram
UVLO
Gate Driver Control Logic
OverTemperature Protection Slope Compensation
Current limit
Current Sense Amplifier
ICMP Error Amplifier
Oscillator
COMP EAMP Softstart VREF 0.25V
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Typical Application Circuits
22µH 4.7µF Duty=100%, ILED=20mA Duty=0%, 4.7µF WLEDs 100Hz~100KHz
VOUT
22µH
VOUT
WLEDs
APW7136
APW7136
Figure Typical WLEDs Application
22µH 4.7µF
Figure Brightness control using signal applies
VOUT
WLEDs
APW7136
120K VADJ 0.1µF
3.3V brightness control Duty=100%, Duty=0%, ILED=20mA
VREF
ILED,MAX VADJ,MIN ILED,MIN VADJ,MAX VADJ,MAX ILED,MAX VREF ILED,MIN VADJ,MIN ILED,MIN VREF ILED,MAX
,MIN ILED ,MAX
Figure Brightness control using filtered signal
4.5V~6V
10µF 10µH
VOUT
10µF
Strings total
APW7136
0603
Figure Circuit driving WLEDs
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Function Descriptions
Main Control Loop APW7136 constant frequency current-mode switching regulator. During normal operation, internal N-channel power MOSFET turned each cycle when oscillator sets internal latch turned when internal comparator (ICMP) resets latch. peak inductor current which ICMP resets latch controlled voltage COMP node, which output error amplifier (EAMP). external resistive divider connected between VOUT ground allows EAMP receive output feedback voltage pin. When load current increases, causes slightly decrease relative 0.25V reference, which turn causes COMP voltage increase until average inductor current matches load current. Under-Voltage Lockout (UVLO) Under-Voltage Lockout (UVLO) circuit compares input voltage with UVLO threshold (2.2V, typical) ensure input voltage high enough reliable operation. 100mV (typ) hysteresis prevents supply transients from causing restart. Once input voltage exceeds UVLO rising threshold, startup begins. When input voltage falls below UVLO falling threshold, controller turns converter. Soft-Start APW7136 built-in soft-start control Nchannel MOSFET current rise during start-up. During softstart, internal ramp, connected inverting inputs, raise replace output voltage error amplifier until ramp voltage reaches VCOMP. Current-Limit Protection APW7136 monitors inductor current, flowing through N-channel MOSFET, limits current peak current-limit level prevent loads APW7136 from damages during overload conditions. Over-Temperature Protection (OTP) over-temperature circuit limits junction temperature APW7136. When junction temperature exceeds thermal sensor turns power MOSFET, allowing devices cool. thermal sensor allows converters start soft-start process regulate output voltage again after junction temperature cools 40C. designed with hysteresis lowers average Junction Temperature (TJ) during continuous thermal overload conditions, increasing lifetime device. Enable/Shutdown Driving ground places APW7136 shutdown mode. When shutdown, internal power MOSFET turns off, internal circuitry shuts down quiescnet supply current reduces maximum. This also could used digital input allowing brightness control using signal from 100Hz 100KHz. duty cycle signal corresponds zero LEDs current 100% corresponds full one. Open-LED Protection driving applications, feedback voltage falls down LEDs, series, failed. Meanwhile, converter unceasingly boosts output voltage like open-loop operation. Therefore, overvoltage protection (OVP), monitoring output voltage pin, integrated into chip prevent output voltages from exceeding their maximum voltage ratings. When voltage rises above threshold, converter stops switching prevents output voltage from rising. converter work again when voltage falls below falling voltage threshold.
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Application Information
Input Capacitor Selection input capacitor (CIN) reduces ripple input current drawn from input supply reduces noise injection into reflected ripple voltage will smaller when input capacitor with larger capacitance used. reliable operation, recommended select capacitor with maximum voltage rating least times maximum input voltage. capacitors should placed close GND. Inductor Selection Selecting inductor with resistance reduces conduction losses achieves high efficiency. efficiency moderated whilst using small chip inductor which operates with higher inductor core losses. Therefore, necessary take further consideration while choosing adequate inductor. Mainly, inductor value determines inductor ripple current: larger inductor value results smaller inductor ripple current lower conduction losses converter. However, larger inductor value generates slower load transient response. reasonable design rule ripple current, maximum average inductor current, IL(AVG). inductor value obtained below,
VOUT (MAX (AVG
peak inductor current calculated following equation: IPEAK IIN(MAX
(VOUT VOUT
IOUT VOUT
N-FET
COUT
ILIM IPEAK
IOUT
Output Capacitor Selection current-mode control scheme APW7136 allows usage tiny ceramic capacitors. higher capacitor value provides good load transients response. Ceramic capacitors with values have lowest output voltage ripple recommended. required, tantalum capacitors used well. output ripple voltages across ideal output capacitor. VOUT VESR VCOUT VCOUT IOUT COUT
where input voltage VOUT output voltage switching frequency IOUT maximum output current amp. Efficiency /IL(AVG) inductor ripple current/average current (0.3 typical) avoid saturation inductor, inductor should rated least maximum input current converter plus inductor ripple current. maximum input current calculated below:
IIN(MAX IOUT (MAX VOUT
VESR IPEAK RESR where IPEAK peak inductor current.
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Copyright ANPEC Electronics Corp. Rev. Jan., 2008
APW7136A/B/C
Application Information (Cont.)
Output Capacitor Selection (Cont.) ceramic capacitor application, output voltage ripple dominated VCOUT. When choosing input output ceramic capacitors, with their good temperature voltage characteristics recommended. Diode Selection achieve high efficiency, Schottky diode must used. current rating diode must meet peak current rating converter.
Recommended Inductor Selection
Designator Manufacturer GOTREND Part Number GTSD32 Inductance (µH) (ohm) 0.592 Saturation Current 0.52 Dimensions (mm3) 3.85 3.85
Setting Current figure converter regulates voltage pin, connected with cathod lowest current-sense resistor 0.25V (typical). Therefore current (ILED), flowing LEDs calculated following equation: ILED 0.25V/R1
Recommended Capacitor Selection
Designator Manufacturer Part Number Murata GRM188R60J475KE19 Murata GRM21BR71H105KA12 Capacitance (µF) Code Rated Voltage Case size 0603 0805
Recommended Diode Selection
Designator Manufacturer Zowie Zowie Part Number MSCD106 MSCD104 Maximum average forward rectified current Maximum repetitive peak reverse voltage Case size 0805 0805
Layout Consideration
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 GND. Connecting capacitor with pins short wide tracks without using vias filtering minimizing input voltage ripple. inductor should placed close possible minimize length copper tracks well 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 track minimize noise coupling into this circuit. star ground connection ground plane minimizes ground shifts noise recommended.
Anode WLEDs
VOUT
VADJ
From Cathod WLEDs
Refer Fig.
Optimized APW7136 Layout
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Package Information
SOT-23-6
VIEW
0.25 GAUGE PLANE SEATING PLANE VIEW
SOT-23-6 MILLIMETERS MIN. MAX. 1.45 0.00 0.90 0.30 0.08 2.70 2.60 1.40 0.95 1.90 0.30 0.60 0.012 0.15 1.30 0.50 0.22 3.10 3.00 1.80 0.000 0.035 0.012 0.003 0.106 0.102 0.055 0.037 0.075 0.024 MIN. INCHES MAX. 0.057 0.006 0.051 0.020 0.009 0.122 0.118 0.071
Note Follow JEDEC TO-178 Dimension include mold flash, protrusions gate burrs. Mold flash, protrusion gate burrs shall exceed side.
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APW7136A/B/C
Carrier Tape Reel Dimensions
SECTION SECTION
Application
SOT-23-6
178.0± 2.00 4.0± 0.10
MIN. 4.0± 0.10
8.4+2.00 13.0+0.50 0.30 1.75± 0.10 3.5± 0.05 MIN. 20.2 MIN. 8.0± -0.00 -0.20 1.5+0.10 0.6+0.00 2.0± 0.10 3.20± 0.20 3.10± 0.20 1.50± 0.20 MIN. -0.00 -0.40
(mm)
Devices Unit
Package Type SOT-23-6 Unit Tape Reel Quantity 3000
Copyright ANPEC Electronics Corp. Rev. Jan., 2008
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APW7136A/B/C
Reflow Condition
(IR/Convection Reflow)
Critical Zone Ramp-up
Temperature
Tsmax
Tsmin Ramp-down Preheat
25°C Peak
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
Time
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 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.
Note: temperatures refer topside package. Measured body surface.
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APW7136A/B/C
Classification Reflow Profiles (Cont.)
Table SnPb Eutectic Process Package Peak Reflow Temperatures Package Thickness <2.5 Volume <350
Volume
+0/-5°C +0/-5°C
+0/-5°C +0/-5°C
Table Pb-free Process Package Classification Reflow Temperatures Package Thickness Volume <350
Volume 350-2000
Volume >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, R.O.C. 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. Jan., 2008
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1MHz, High-Efficiency, Step-Up Converter White LEDs Wide Input Vo

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