Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 General Description Features The AP3005 is a 420kHz fixed frequency PWM buck (step-down) DC-DC converter, capable of driving a 2A load with high efficiency, low ripple and excellent line and load regulation. The device includes a voltage reference, an oscillation circuit, an error amplifier, an internal PMOS and etc. • • • • • • • • • • The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. The enable function, over current protection function, short circuit protection function and soft-start function are built inside. When OCP or SCP happens, the operation frequency will be reduced from 420kHz to 40kHz. An internal compensation block is employed to minimize external components. 2A Constant Output Current 130mΩ RDSON Internal Power MOSFET Switch Up to 94% Efficiency Fixed 420kHz Frequency Wide 4.75V to 25V Input Voltage Range Output Voltage Adjustable from 0.8V to 21V Built in Thermal Shutdown Function Built-in Current Limit Function Built-in Soft-Start Function Support Ceramic or Electrolytic Capacitors Applications • • • • • The AP3005 serves as an ideal power supply unit for portable devices, especially for chip set power in portable systems. It’s widely used for PDVD, LCD monitor and DPF chip set powers. Portable DVD LCD Monitor/LCD TV Digital Photo Frame ADSL Set-up Box The AP3005 is available in SOIC-8 package. SOIC-8 Figure 1. Package Type of AP3005 Jun. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Pin Configuration M Package (SOIC-8) NC 1 8 NC VIN 2 7 EN SW 3 6 COMP GND 4 5 FB Figure 2. Pin Configuration of AP3005 (Top View) Pin Description Pin Number Pin Name 1, 8 NC 2 VIN 3 SW 4 GND 5 FB 6 COMP 7 EN Jun. 2009 Function No Connection Supply Voltage Input Pin. The AP3005 operates from a 4.75V to 25V DC voltage. Bypass VIN to GND with a suitable large capacitor to eliminate noise on the input Power Switch Output Pin. SW is the switch node that supplies power to the output Ground Pin. Feedback Pin. Through an external resistor divider network, FB senses the output voltage and regulates it. To prevent current limit run away in a short circuit fault condition, the frequency feedback comparator lowers the oscillator frequency to 40kHz when the FB voltage is below 0.52V. The feedback threshold voltage is 0.8V Compensation Pin. This pin is the output of the error amplifier. Frequency compensation is done at this pin by connecting a series RC to ground (parallel a C if necessary) Enable Pin. Drive EN pin high to turn on the device, drive it low to turn off. Default of this pin is high level Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Functional Block Diagram EN 7 UVLO OCP Bias Current VREF (0.8V) Current Limit EA 5 Latch COMP Driver PMOS OTP 420kHz/40kHz Oscillator OSP 0.52V VIN Soft-start Reference Voltage Source and Bias Current Source FB 2 3 4 SW GND 6 COMP Figure 3. Functional Block Diagram of AP3005 Ordering Information AP3005 G1: Green Circuit Type Blank: Tube TR: Tape & Reel Package M: SOIC-8 Package Temperature Range SOIC-8 -40 to 125°C Part Number Marking ID Packing Type AP3005M-G1 3005M-G1 Tube AP3005MTR-G1 3005M-G1 Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Jun. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage VIN -0.3 to 30 V FB Pin Voltage VFB -0.3 to 6 V EN Pin Voltage VEN -0.3 to VIN V VCOMP -0.3 to 6 V VSW -0.3 to VIN V Power Dissipation PD Internally limited mW Thermal Resistance (Junction to Ambient, No Heat Sink, Free Air) θJA 100 ºC/W Operating Junction Temperature TJ 150 ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10sec) TLEAD 260 ºC ESD (Human Body Model) ESD 2000 V COMP Pin Voltage SW Pin Voltage 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 Input Voltage VIN 4.75 25 V VOUT 0.8 21 V TJ -40 125 ºC Output Voltage Operating Junction Temperature Jun. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Electrical Characteristics VCC=12V, VOUT=5V, TA=25℃, unless otherwise specified. Parameters Symbol Input Voltage VIN Shutdown Quiescent Current ISHDN Conditions Min Typ 4.75 Max Unit 25 V VEN=0.4V 44 60 µA VEN=2V, VFB=1.3V 1.3 2 mA 0.8 0.816 V -0.1 -0.5 µA Quiescent Current IQ Feedback Voltage VFB VIN=5V to 25V Feedback Bias Current IFB VFB=1.3V Switch Current Limit ILIM 2.5 3.4 Oscillator Frequency fOSC 336 420 Frequency of Current Limit or Short Circuit Protection fOSC1 0.784 VFB<0.52V A 504 kHz 40 kHz Error Amplifier Voltage Gain GV 1000 V/V Error Amplifier Transconductance GS 700 µA/V EN Pin Threshold VH 1.5 V 0.7 V -5 -10 µA 130 150 mΩ 100 % VL EN Pin Input Leakage Current IEN VEN=2.5V VIN=12V, VFB=0.65V VEN=12V, IOUT=2A VFB=0.65V, ISW=0.1A Internal PMOS ON Resistance RDSON Maximum Duty Cycle DMAX Thermal Shutdown TOTSD 155 ºC Thermal Shutdown Hysteresis THYS 20 ºC Jun. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Typical Performance Characteristics VCC=12V, VOUT=5V, TA=25℃, unless otherwise specified. 550 100 Operation Frequency (kHz) 500 Efficiency (%) 90 80 VOUT=3.3V 70 VOUT=5.0V 450 400 350 300 250 60 0.4 0.8 1.2 1.6 2.0 -40 0 80 120 o Figure 4. Efficiency vs. Output Current Figure 5. Operation Frequency vs. Temperature 100 2.4 2.0 Efficiency (%) Supply Quiescent Current (mA) 40 Temperature ( C) Output Current (A) 1.6 1.2 o TA=125 C 90 80 VOUT=5.0V o TA=75 C 0.8 IOUT=1.0A o IOUT=2.0A TA=25 C o 0.4 TA= -50 C 4 8 12 16 20 70 24 Figure 6. Supply Quiescent Current vs. Input Voltage Jun. 2009 8 12 16 20 24 Input Voltage (V) Input Voltage (V) Figure 7. Efficiency vs. Input Voltage Rev. 1. 2 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Typical Performance Characteristics (Continued) VCC=12V, VOUT=5V, TA=25℃, unless otherwise specified. 6 120 o 100 5 TA=75 C o TA=25 C 80 OCP Current Limit (A) Shutdown Quiescent Current (µA) o TA=125 C o TA= -50 C 60 40 20 0 4 3 2 1 4 8 12 16 20 0 24 -40 0 80 120 Temperature ( C) Figure 8. Shutdown Quiescent Current vs. Input Voltage Figure 9. OCP Current Limit vs. Temperature 0.806 6 0.804 5 OCP Current Limit (A) Feedback Voltage (V) 40 o Input Voltage (V) 0.802 0.800 0.798 0.796 4 3 2 1 0.794 0 -40 0 40 80 120 Temperature ( C) Figure 10. Feedback Voltage vs. Temperature Jun. 2009 4 8 12 16 20 24 Input Voltage (V) o Figure 11. OCP Current Limit vs. Input Voltage Rev. 1. 2 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Typical Performance Characteristics (Continued) VCC=12V, VOUT=5V, TA=25℃, unless otherwise specified. 5.20 44 5.15 5.10 Output Voltage (V) OCP Frequency (kHz) 40 36 32 5.05 5.00 4.95 4.90 VIN=12V 28 o TA=25 C 4.85 24 -40 0 40 80 4.80 0.0 120 0.5 1.0 1.5 2.0 Output Current (A) o Temperature ( C) Figure 12. OCP Frequency vs. Temperature Figure 13. Output Voltage vs. Output Current Maximum Output Current (A) 3.5 3.0 2.5 2.0 O TA=25 C 1.5 VOUT=2.5V VOUT=3.3V 1.0 VOUT=5.0V 0.5 5 10 15 20 25 Input Voltage (V) Figure 14. Maximum Output Current vs. Input Voltage Jun. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Typical Application (VIN=12V, VOUT =5V, IOUT =2A) Figure 15. Typical Application 1 of AP3005 Applied with Ceramic Input and Output Capacitors Figure 16. Typical Application 2 of AP3005 Applied with Electrolytic Input and Output Capacitors Jun. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet 2A 420kHz PWM BUCK DC-DC CONVERTER AP3005 Mechanical Dimensions SOIC-8 Jun. 2009 Rev. 1. 2 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 10 BCD Semiconductor Manufacturing Limited 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. 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