Data Sheet WHITE LED STEP-UP CONVERTER AP3030 General Description Features The AP3030 is an inductor-based DC/DC converter designed to drive up to eight white LEDs in series or 2 rows of LEDs with 5 for each in parallel for backlight. Only one feedback resistor is needed to control the LED current and obtain required brightness. · · · · · · · A constant frequency 1.2MHz PWM control scheme is employed in this IC, which means tiny external components can be used. Specifically, 1mm tall inductor and 0.22µF output capacitor for a typical application are sufficient. Additionally, the schottky diode in boost circuit is integrated on this chip. AP3030 also provides a disable pin to ease its use for different systems. Inherently Uniform LED Current High Efficiency up to 84% No Need for External Schottky Diode Output Over-Voltage Protection (OVP) Fixed 1.2MHz Switching Frequency Uses Tiny 1mm Tall Inductor Requires Only 0.22µF Output Capacitor Applications · · · · · The output over-voltage protection is implemented in AP3030. When any LED is broken or in other abnormal conditions, the output voltage will be clamped. Cellular Phones Digital Cameras LCD modules GPS Receivers PDAs, Handheld Computers The AP3030 is available in standard SOT-23-6 and TSOT-23-6 packages. TSOT-23-6 SOT-23-6 Figure 1. Package Types of AP3030 Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 1 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Pin Configuration K/KT Package (SOT-23-6/TSOT-23-6) Pin 1 Dot by Marking SW 1 6 VIN GND 2 5 VOUT FB 3 4 CTRL Figure 2. Pin Configuration of AP3030 (Top View) Pin Description Pin Number Pin Name Function 1 SW 2 GND 3 FB 4 CTRL Shutdown and Dimming Pin. Connect to 1.8V or higher to enable device; Connect to 50mV or less to disable device; Connect to a voltage between 1.8V and 50mV to achieve linear dimming 5 VOUT Output Pin. Connected to the cathode of internal schottky diode 6 VIN Switch Pin. Connect external inductor Ground Voltage Feedback. Reference voltage is 200mV Input Supply Pin. Must be locally bypassed Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 2 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Functional Block Diagram FB SW 3 1 5 SOFT START VIN 6 VREF 1.25 V 200 mV OVP DRIVER A1 Q R A2 S VOUT Q1 COMPARATOR Σ CTRL 2 4 GND RAMP GENERATOR 1.2 MHz OSCILLATOR Figure 3. Functional Block Diagram of AP3030 Ordering Information AP3030 - Circuit Type E1: RoHS Package TR: Tape and Reel K: SOT-23-6 KT: TSOT-23-6 Package SOT-23-6 TSOT-23-6 Temperature Range o Part Number Marking ID Packing Type -40 to 85 C AP3030KTR-E1 EEB Tape & Reel -40 to 85oC AP3030KTTR-E1 S9G Tape & Reel BCD Semiconductor's products as designated with "E1" suffix in the part number are RoHS compliant. Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 3 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage VIN 20 V SW Voltage VSW 38 V FB Voltage VFB 20 V VCTRL 20 V RθJA 265 oC/W TJ 150 o C TSTG -65 to 150 o C TLEAD 260 o C ESD (Machine Model) 250 V ESD (Human Body Model) 2000 V CTRL Voltage Thermal Resistance (Junction to Atmosphere, No Heat Sink) Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10sec) Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Operating Temperature Range TOP -40 85 o Input Voltage VIN 2.5 16 V CTRL Voltage VCTRL 16 V Oct. 2009 Rev. 1. 6 Unit C BCD Semiconductor Manufacturing Limited 4 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Electrical Characteristics (VIN=3V, VCTRL =3V, TA=25oC, unless otherwise specified.) Parameter Symbol Minimum Operating Voltage VIN(min) Maximum Operating Voltage VIN(max) Conditions Min Typ Max Unit 2.5 V Feedback Voltage VFB FB Pin Bias Current IFB Quiescent Current IQ 16 IOUT=20mA, 4 LEDs, TA=-40oC to 85oC 188 200 212 mV 35 100 nA VFB=VIN, no switching 1.5 2.5 3.2 mA VCTRL=0V 2.0 3.2 5.0 µA f 0.9 1.2 1.5 MHz Maximum Duty Cycle DMAX 90 93 Switch Current Limit (Note 2) ILIMIT Shutdown Quiescent Current Switch Frequency Switch VCE Saturation Voltage ISHDN VCESAT Switch Leakage Current CTRL Pin Voltage VCTRL D=40% 550 D=80% 550 ISW=250mA 360 VSW=5V 0.01 High OVP Voltage Schottky Forward Drop ICTRL Schottky Leakage Current Thermal Resistance (Junction to Case) 55 TA=85oC 50 TA=-40oC 75 µA 72 µA 30 V ID=150mA 0.7 V VR=23V 0.1 4 µA 150 t θJC 5 0.05 VR=27V Soft Start Time mV V Low VOV VDROP mA 1.8 40 CTRL Pin Bias Current % 300 SOT-23-6 60 TSOT-23-6 60 µS oC/W Note 2: The switch current limit is related to duty cycle. Please refer to Figure 15 for detail. Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 5 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Typical Performance Characteristics (VF(forward voltage) of WLED is 3.45V @ IF=20mA, unless otherwise noted ) 83 86 82 84 81 82 Efficiency (%) Efficiency (%) 80 79 78 77 80 78 76 76 CIN=1µF, COUT=0.22µF, L=22µH 74 73 -50 -25 0 25 50 O IOUT=20mA, 8LEDs,TA=25 C 74 VIN=3.6V, IOUT=20mA, 8LEDs 75 75 CIN=1µF, COUT=0.22µF, L=22µH 72 70 3.0 100 3.5 o Junction Temperature ( C) Figure 4. Efficiency vs. Junction Temperature 4.5 5.0 Figure 5. Efficiency vs. Input Voltage 350 86 85 Schottky Forward Current (mA) 300 84 83 Efficiency (%) 4.0 Input Voltage (V) 82 81 80 79 O VIN=3.6V, IOUT=20mA,TA=25 C 78 CIN=1µF, COUT=0.22µF, L=22µH 250 200 150 100 50 77 76 2 3 4 5 6 7 0 8 0 200 400 600 800 1000 Schottky Forward Drop (mV) LED's Number Figure 6. Efficiency vs. LED's Number Figure 7. Schottky Forward Current vs. Schottky Forward Drop Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 6 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Typical Performance Characteristics (Continued) (VF(forward voltage) of WLED is 3.45V @ IF=20mA, unless otherwise noted ) 3.0 2.5 25 Quiescent Current (mA) Shutdown Quiescent Current (µA) 30 20 15 10 5 0 2.0 1.5 1.0 O -50 C O 25 C O 100 C 0.5 2 4 6 8 10 12 14 0.0 16 0 2 4 6 Input Voltage (V) 8 10 12 14 16 Input Voltage (V) Figure 8. Shutdown Quiescent Current vs. Input Voltage Figure 9. Quiescent Current vs. Input Voltage 1.40 6.0 1.35 5.5 1.30 1.25 Frequency (MHz) Input Current (mA) 5.0 4.5 4.0 3.5 3.0 1.20 1.15 1.10 1.05 1.00 2.5 0.95 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0.90 -50 Input Voltage (V) -25 0 25 50 75 100 o Junction Temperature ( C) Figure 11. Switch Frequency vs. Junction Temperature Figure 10. Input Current in Output Open Circuit vs. Input Voltage Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 7 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Typical Performance Characteristics (Continued) 210 0.80 208 0.78 206 0.76 Schottky Forward Drop (V) Feedback Voltage (mV) (VF(forward voltage) of WLED is 3.45V @ IF=20mA, unless otherwise noted ) 204 202 200 198 196 194 192 0.74 0.72 0.70 0.68 0.66 0.64 0.62 190 -50 -25 0 25 50 75 0.60 -50 100 -25 0 50 75 100 Junction Temperature ( C) Figure 12. Feedback Voltage Figure 13. Schottky Forward Drop vs. Junction Temperature vs. Junction Temperature 0.50 700 0.45 VR=10V 0.40 VR=16V 0.35 VR=23V 600 Current Limit (mA) Schottky Leakage Current (µA) 25 o o Junction Temperature ( C) 0.30 0.25 0.20 0.15 500 400 300 O 0.10 -50 C O 25 C O 100 C 200 0.05 0.00 -50 -25 0 25 50 75 100 30 100 o 40 50 60 70 80 90 Duty Cycle (%) Junction Temperature ( C) Figure 15. Switch Current Limit vs. Duty Cycle Figure 14. Schottky Leakage Current vs. Junction Temperature Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 8 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Typical Performance Characteristics (Continued) (VF(forward voltage) of WLED is 3.45V @ IF=20mA, unless otherwise noted ) 250 450 Feedback Voltage VFB (mV) Saturation Voltage (mV) 400 350 300 250 200 150 200 150 100 50 100 50 50 100 150 200 250 0 0.0 300 Switch Current (mA) 0.5 1.0 1.5 2.0 2.5 CTRL Voltage (V) Figure 16. Switch Saturation Voltage Figure 17. Feedback Voltage vs. CTRL Pin Voltage vs. Switch Current Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 9 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Typical Application VIN ≥ 3V L 22µΗ SW VIN Control Signal VOUT COUT AP3030 CTRL GND CIN 0.22µF FB 10Ω 1µF C: X5R or X7R Dielectric L: SUMIDA CDRH5D28R-220NC or Equivalent This circuit can work in full temperature Figure 18. Typical Application of Eight LED Drivers VIN ≥ 3V L 22µΗ VIN Control Signal SW VOUT COUT AP3030 CTRL CIN 0.22µF FB GND 10Ω 1µF 10Ω C: X5R or X7R Dielectric L: SUMIDA CDRH5D28R-220NC or Equivalent Two transistors are recommended to use Dual Matched transistor pairs This circuit can work in full temperature Figure 19. Typical Application of Ten LED Drivers Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 10 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Mechanical Dimensions SOT-23-6 Unit: mm(inch) 0° 2.820(0.111) 8° 3.020(0.119) 0.300(0.012) 0.400(0.016) 5 0.300(0.012) 0.600(0.024) 4 1.500(0.059) 1.700(0.067) 2.650(0.104) 2.950(0.116) 6 0.200(0.008) Pin 1 Dot by Marking 1 2 3 0.700(0.028)REF 0.950(0.037)TYP 0.000(0.000) 0.100(0.004) 1.800(0.071) 2.000(0.079) 0.100(0.004) 0.200(0.008) 0.900(0.035) 1.450(0.057) MAX 1.300(0.051) Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 11 Data Sheet WHITE LED STEP-UP CONVERTER AP3030 Mechanical Dimensions (Continued) TSOT-23-6 2.800(0.110) 3.000(0.118) Unit: mm(inch) R0.100(0.004) 0° 8° MIN 1.500(0.059) 1.700(0.067) 2.600(0.102) 3.000(0.118) Pin 1 Dot by Marking 0.370(0.015) MIN 0.950(0.037) BSC 0.100(0.004) 0.250(0.010) 1.900(0.075) BSC 0.250(0.010) BSC GAUGE PLANE 0.700(0.028) 0.900(0.035) 1.000(0.039) MAX 0.000(0.000) 0.100(0.004) 0.350(0.014) 0.510(0.020) Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 12 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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