Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A General Description Features The AP3036/A is an inductor-based DC/DC converter designed to drive up to eight white LEDs in series for backlight. Only one feedback resistor is needed to control the LED current and obtain required brightness. • • • • • • • • A constant frequency 1.0MHz 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 is sufficient. Additionally, the Schottky diode in boost circuit is integrated on this chip. The AP3036/A 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 1.0MHz Switching Frequency Uses Tiny 1mm Tall Inductor Requires Only 0.22µF Output Capacitor High Frequency Dimming Control Applications • • • • • The output over-voltage protection is implemented in AP3036/A. 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 AP3036/A is available in standard SOT-23-6 and TSOT-23-6 packages. SOT-23-6 TSOT-23-6 Figure 1. Package Types of AP3036/A Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A 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 AP3036/A (Top View) Pin Description Pin Number Pin Name 1 SW 2 GND 3 FB Voltage feedback pin. The reference voltage is 200mV for AP3036 and 250mV for AP3036A 4 CTRL Shutdown and dimming pin. Connect to 1.8V or higher to enable device; Connect to 0.4V or less to disable device; Connect to a PWM signal to achieve LEDs brightness dimming 5 VOUT Output pin. Connect to the cathode of internal Schottky diode 6 VIN Jul. 2012 Function Switch pin. Connect external inductor Ground Input supply pin. Must be connected to a local bypass capacitor Rev. 1.3. BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Functional Block Diagram Figure 3. Functional Block Diagram of AP3036/A Ordering Information AP3036 - Circuit Type G1: Green Blank: AP3036 A: AP3036A TR: Tape & Reel Package K: SOT-23-6 KT: TSOT-23-6 Package Temperature Range SOT-23-6 -40 to 85°C TSOT-23-6 Part Number Marking ID Packing Type AP3036KTR-G1 GHI Tape & Reel AP3036AKTR-G1 GJE Tape & Reel AP3036KTTR-G1 L2C Tape & Reel AP3036AKTTR-G1 L3C Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage VIN 20 V SW Pin Voltage VSW 38 V Feedback Voltage VFB 20 V VCTRL 20 V θJA 265 °C/W TJ 150 °C Storage Temperature Range TSTG -65 to 150 °C Lead Temperature (Soldering, 10sec) TLEAD 260 °C ESD (Machine Model) 250 V ESD (Human Body Model) 2000 V CTRL Pin Voltage Thermal Resistance (Junction Ambient, No Heat Sink) Operating Junction Temperature to 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 Unit Operating Temperature Range TOP -40 85 °C Input Voltage VIN 2.5 16 V 16 V CTRL Pin Voltage Jul. 2012 VCTRL Rev. 1.3. BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Electrical Characteristics VIN =3V, VCTRL=3V, TA=25°C, 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 AP3036 AP3036A 16 IOUT=20mA, 4 LEDs FB Pin Bias Current IFB Quiescent Current IQ VFB=VIN, Switching ISHDN VCTRL=0V Shutdown Quiescent Current Switching Frequency f Maximum Duty Cycle DMAX Switch Current Limit (Note 2) ILIMIT Switch VCE Saturation Voltage VCESAT Switch Leakage Current 1.6 200 250 212 265 mV 35 100 nA 3.1 3.9 mA 45 75 µA 1.0 MHz 93 % D=40% or 80% 550 mA ISW=250mA 360 mV VSW=5V 0.01 90 High CTRL Pin Voltage No 188 235 5 µA 1.8 VCTRL V Low 0.4 CTRL Pin Bias Current ICTRL 100 µA OVP Voltage VOV 30 V 0.7 V Schottky Forward Drop VDROP VR(Reverse Voltage)=23V VR(Reverse Voltage)=27V Schottky Leakage Current Soft Start Time Thermal Resistance (Junction to Case) ID=150mA t 0.1 4 µA 150 100 SOT-23-6 60 TSOT-23-6 60 θJC µs °C/W Note 2: The switch current limit is related to duty cycle. Please refer to Figure 16 for detail. Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. 90 88 1600 VIN=3.6V Schottky Forward Voltage (mV) IOUT=20mA 86 Efficiency (%) 84 82 80 78 76 74 1200 800 400 0 72 2 3 4 5 6 7 8 0 LED Numbers 200 300 400 500 Schottky Forward Current (mA) Figure 4. Efficiency vs. LED’s Number Figure 5. Schottky Forward Voltage vs. Schottky Forward Current 3.8 100 90 VCRTL=0V VFB=1.0V 3.6 Quiescent Current (mA) Shutdown Current (µA) 100 80 70 60 50 3.4 3.2 3.0 40 2.8 30 0 2 4 6 8 10 12 14 16 18 20 0 Input Voltage (V) 8 12 16 20 Input Voltage (V) Figure 6. Shutdown Current vs. Input Voltage Jul. 2012 4 Figure 7. Quiescent Current vs. Input Voltage Rev. 1.3. BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics (Continued) The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. 300 250 Current Limit (mA) Feedback Voltage (mV) 600 200 150 VIN=3.6V 500 400 VIN=3.6V, 5 LEDs AP3036 AP3036A 300 100 -40 0 40 80 120 160 -40 0 40 80 120 160 O O Temperature ( C) Temperature ( C) Figure 8. Feedback Voltage vs. Temperature Figure 9. Current Limit vs. Temperature 800 700 VIN=3.6V, 5 LEDs VIN=VCRTL=3.6V Rising Down 600 CTRL Voltage (V) Saturation Voltage (mV) 1.2 500 400 300 200 0.8 0.4 100 0 0.0 0 100 200 300 400 500 -40 40 80 120 160 Temperature ( C) Figure 10. Saturation Voltage vs. Switch Current Jul. 2012 0 O Switch Current (mA) Figure 11. CTRL Pin Voltage vs. Temperature Rev. 1.3. BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics (Continued) The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. 36 Operating Frequency (MHz) 32 OVP Voltage (V) VIN=3.6V 1.2 VIN=VCRTL=3.6V 28 24 5 LEDs 1.0 0.8 20 0.6 -40 0 40 80 120 -40 160 0 O 40 80 120 160 O Temperature ( C) Temperature ( C) Figure 12. OVP Voltage vs. Temperature Figure 13. Operating Frequency vs. Temperature 90 88 VIN=3.6V 85 80 Efficiency (%) 80 Efficiency (%) 5 LEDs 84 75 70 76 72 68 ILED=20mA 65 64 8 LEDs 60 60 20 2 4 6 8 10 12 14 16 18 30 40 50 60 70 Output Current (mA) 20 Input Voltage (V) Figure 14. Efficiency vs. Input Voltage Jul. 2012 Figure 15. Efficiency vs. Output Current Rev. 1.3. BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics (Continued) The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. 30 30 VIN=3.6V, 5 LEDs 25 VIN=3.6V, 5 LEDs 25 PWM Frequency=100KHz LED Current (mA) LED Current (mA) PWM Frequency=0.5kHz 20 15 10 20 15 10 5 5 0 0 0 0 20 40 60 80 20 40 60 80 100 Duty (%) 100 Duty (%) Figure 16. LED Current vs. Duty Figure 17. LED Current vs. Duty VCTRL 2V/div VIN 2V/div VSW 10V/div VSW 10V/div VOUT 10V/div VOUT 10V/div IL 100mA/div ILED 10mA/div Time 40µs/div Figure 18. Powering On (VIN=3.6V, VCTRL=2.5V, ILED=20mA, 5 LEDs) Jul. 2012 Time 10ms/div Figure 19. PWM Dimming (VIN=3.6V, VPWM=2.5V, fPWM=0.5kHz, Duty=50%, 5 LEDs) Rev. 1.3. BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Performance Characteristics (Continued) The WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted. VIN 2V/div VIN 2V/div VSW 10V/div VSW 10V/div VOUT1(AC) 100mV/div VOUT 10V/div IL 100mA/div ILED 10mA/div Time 1µs/div Figure 20. Output Voltage Ripple (VIN=VCTRL=3.6V, ILED=20mA, 5 LEDs) Jul. 2012 Time 10µs/div Figure 21. PWM Dimming (VIN=3.6V, VPWM=2.5V, fPWM=100kHz, Duty=50%, 5 LEDs) Rev. 1.3. BCD Semiconductor Manufacturing Limited 10 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Typical Application Figure 22. Typical Application of AP3036/A (Note 3) Note 3: C: X5R or X7R type dielectric, L: SUMIDA CDRH5D28R-220NC or equivalent. And, this circuit can work in full temperature. Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited 11 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A 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) 6 0.200(0.008) 5 0.300(0.012) 0.600(0.024) 4 Pin 1 Dot by Marking 1 2 3 0.700(0.028)REF 0.950(0.037)TYP 0.000(0.000) 0.150(0.006) 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) Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited 12 Preliminary Datasheet WHITE LED STEP-UP CONVERTER AP3036/A Mechanical Dimensions (Continued) TSOT-23-6 2.800(0.110) 3.000(0.118) 1.500(0.059) 1.700(0.067) Unit: mm(inch) R0.100(0.004) MIN 0° 8° 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) Jul. 2012 0.350(0.014) 0.510(0.020) Rev. 1.3. 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