Preliminary Datasheet WHITE LED DRIVER AP3008 General Description Features The AP3008 is a 1.2MHz PWM boost switching regulator designed for constant-current white LED driver applications. · · · · · · · · The AP3008 can drive a string of 2 to 3 white LEDs from a 2.7V supply in series, ensuring uniform brightness and eliminating several ballast resistors. The AP3008 implements a constant frequency 1.2MHz PWM control scheme. The high frequency PWM operation also saves board space by reducing external component sizes. To improve efficiency, the feedback voltage is set to 95 mV, which reduces the power dissipation in the current setting resistor. Inherently Uniform LED Current High Efficiency up to 84% Drives 2 to 3 LEDs from a 2.7V Supply 1.2MHz PWM Operation Frequency Requires Only 0.22µF Output Capacitor Shutdown Current: < 1µA Built-in Output Over-Voltage Protection Under Voltage Lock Out (UVLO) Applications · · · · · The AP3008 is equipped with OVP protection ability, the SW pin monitors the output voltage and will turn off the device if an over-voltage condition is present to prevent damage from an open circuit condition. Digital Cameras LCD modules GPS Receivers Cellular Phones PDAs, Handheld Computers The AP3008 is available in SOT-23-5L package. SOT-23-5L Figure 1. Package Type of AP3008 Jul. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet WHITE LED DRIVER AP3008 Pin Configuration K Package (SOT-23-5L) SW 1 GND 2 FB 3 5 VIN 4 SHDN Figure 2. Pin Configuration of AP3008 (Top View) Pin Description Pin Number Pin Name 1 SW 2 GND 3 FB 4 SHDN 5 VIN Function Switch Pin. Connect inductor/diode here. The output voltage can range up to 29V but not extend this limit. If the voltage on this pin is higher than the overvoltage protection threshold (OVP), the device comes back to shutdown mode. To restart the chip, one must then send a low to high sequence on shutdown pin or switch off the VIN supply. Ground Pin. Voltage Feedback. Reference voltage is 95mV. Shutdown Pin. Connect to 1.5V or higher to enable device; Connect to 0.4V or less to disable device. Input Supply Pin. Must be locally bypassed. Jul. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet WHITE LED DRIVER AP3008 Functional Block Diagram 1 OVP FB VIN SW 3 5 VREF 1.25V DRIVER A1 95mV Q R A2 Q1 S COMPARATOR Σ SHDN 4 2 GND SHUTDOWN RAMP GENERATOR 1.2MHz OSCILLATOR Figure 3. Functional Block Diagram of AP3008 Ordering Information AP3008 - Circuit Type E1: Lead Free Blank: Tin Lead Package TR: Tape and Reel Blank: Tube K: SOT-23-5L Part Number Marking ID Package Temperature Range Tin Lead Lead Free Tin Lead Lead Free Packing Type SOT-23-5L -40 to 85oC AP3008KTR AP3008KTR-E1 K1B E1B Tape & Reel BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Jul. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet WHITE LED DRIVER AP3008 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage VIN 15 V SW Voltage 36 V FB Voltage 10 V SHDN Voltage 15 V 265 oC/W 150 oC TSTG -65 to 150 oC TLEAD 260 oC ESD (Machine Model) 250 V ESD (Human Body Model) 2000 V Thermal Resistance (Junction to Atmosphere, no Heat sink) RθJA 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 Operating Temperature Range Symbol Min Max Unit TOP -40 85 oC 2.5 12 V Operating Voltage Range Jul. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet WHITE LED DRIVER AP3008 Electrical Characteristics (VIN=3V, VSHDN=3V, TA=25oC, unless otherwise specified.) Parameter Feedback Voltage Symbol VFB Conditions ISW=100mA, Duty Cycle=66% Min Typ Max Unit 86 95 104 mV 45 100 nA FB Pin Bias Current Supply Current ICC VSHDN=VIN, VFB=VIN, No switching 1.9 2.5 mA Supply Current IQ VSHDN=0V 0.1 1.0 µA Switch Frequency f 0.8 1.2 1.6 MHz Maximum Duty Cycle DMAX 85 90 % Switch Current Limit ILIM Duty=15% 320 mA ISW=250mA 350 mV VSW=5V 0.01 Switch VCESAT VCESAT Switch Leakage Current SHDN Voltage VTH High VTL Low µA 1.5 0.4 SHDN Pin Bias Current OVP Voltage 5 VOVP Jul. 2006 Rev. 1. 3 V 50 µA 29 V BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet WHITE LED DRIVER AP3008 Typical Performance Characteristics 2.8 320 2.6 SHDN Pin Bias Current (µA) 2.4 2.2 2.0 IQ (mA) 1.8 o -50 C o 25 C o 100 C 1.6 1.4 1.2 1.0 0.8 0.6 VSHDN=10V VSHDN=3.6V VSHDN=3V VSHDN=2.7V 280 240 200 160 120 80 0.4 40 0.2 0.0 0 2 4 6 8 -50 10 -25 0 25 50 75 100 o Junction Temperature ( C) VIN (V) Figure 4. Quiescent Current vs. VIN Figure 5. SHDN Pin Bias Current vs. Junction Temperature 55 1.4 50 45 Feedback Bias Current (nA) Switch Frequency (MHz) 1.2 1.0 0.8 0.6 0.4 40 35 30 25 20 15 10 0.2 5 0.0 -50 -25 0 25 50 75 0 -50 100 o -25 0 25 50 75 100 o Junction Temperature ( C) Junction Temperature ( C) Figure 6. Switch Frequency vs. Junction Temperature Figure 7. Feedback Bias Current vs. Junction Temperature Jul. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet WHITE LED DRIVER AP3008 Typical Performance Characteristics (Continued) 440 400 84 ILED=20mA 360 Current Limit (mA) Efficiency (%) 320 82 ILED=15mA 80 ILED=10mA VIN=3.6V 3 LEDs 280 240 200 160 120 80 40 78 -50 -25 0 25 50 75 0 100 0 20 40 60 80 100 o Junction Temperature ( C) Duty Cycle (%) Figure 8. Efficiency vs. Junction Temperature Figure 9. Switch Current vs. Duty Cycle 85 85 3 LEDs o VLED=3.35V, TA=25 C VIN=3V 75 4 LEDs o VLED=3.35V, TA=25 C 80 Efficiency (%) Efficiency (%) 80 VIN=3.6V 70 VIN=3V 75 VIN=3.6V 70 65 65 60 60 0 5 10 15 0 20 5 10 15 20 LED Current (mA) LED Current (mA) Figure 10. Efficiency vs. LED Current Figure 11. Efficiency vs. LED Current Jul. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet WHITE LED DRIVER AP3008 Typical Application VIN L1 22µΗ 3V to 5V D1 LED 1 LED 2 OFF VIN ON SHDN SW AP3008 GND C1 1µF LED 3 FB C2 0.22µF R1 6.34Ω C1, C2: X5R or X7R Dielectric L1: SUMIDA CDRH5D28R-220NC or Equivalent Figure 12. Three White LEDs Driver Jul. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet WHITE LED DRIVER AP3008 Mechanical Dimensions SOT-23-5L Unit: mm(inch) 0.300(0.012) 0.600(0.024) 1.500(0.059) 1.700(0.067) 0.100(0.004) 0.200(0.008) 2.950(0.116) 2.650(0.104) 2.820(0.111) 3.020(0.119) 0.200(0.008) 0.700(0.028) REF 0.300(0.012) 0.400(0.016) 0° 8° 1.800(0.071) 2.000(0.079) 1.250(0.049) 1.050(0.041) 0.950(0.037) TYP 0.000(0.000) 0.100(0.004) 1.050(0.041) 1.150(0.045) Jul. 2006 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 9 http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others. MAIN SITE BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited - Wafer Fab Shanghai SIM-BCD Semiconductor Manufacturing Limited 800, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6485 1491, Fax: +86-21-5450 0008 - IC Design Group Advanced Analog Circuits (Shanghai) Corporation 8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 REGIONAL SALES OFFICE Shenzhen Office Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. 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