Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter General Description Features The AP3203 is a 380kHz fixed frequency, current mode, PWM buck (step-down) DC-DC converter, capable of driving a 3A load with high efficiency, excellent line and load regulation. The device integrates N-channel power MOSFET switch with low on-resistance. The current mode control provides fast transient response and cycle-by-cycle current limit. • • • • • • • • • • A standard series of inductors are available from several different manufacturers optimized for use with the AP3203. This feature greatly simplifies the design of switch-mode power supplies. AP3203 Input Voltage Range: 4.75V to 18V Fixed 380kHz Frequency High Efficiency: up to 93% Output Current: 3A Current Mode Control Built-in Over Current Protection Built-in Thermal Shutdown Function Built-in UVLO Function Built-in Over Voltage Protection Programmable Soft-start Applications • • • • This IC is available in PSOP-8 package. Portable DVD DPF LCD-TV STB PSOP-8 Figure 1. Package Type of AP3203 Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter AP3203 Pin Configuration MP Package (PSOP-8) Figure 2. Pin Configuration of AP3203 (Top View) Pin Description Pin Number Pin Name 1 BS 2 IN 3 SW 4 GND 5 FB 6 COMP 7 EN 8 SS Mar. 2011 Function Bootstrap pin. A bootstrap capacitor is connected between the BS pin and SW pin. The voltage across the bootstrap capacitor drives the internal high-side NMOS switch Supply input pin. A capacitor should be connected between the IN pin and GND pin to keep the DC input voltage constant Power switch output pin. This pin is connected to the inductor and bootstrap capacitor Ground pin Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. When the FB pin voltage exceeds 20% of the nominal regulation value of 1.222V, the over voltage protection is triggered. When the FB pin voltage is below 0.6V, the oscillator frequency is lowered to realize short circuit protection Compensation pin. This pin is the output of the transconductance error amplifier and the input to the current comparator. It is used to compensate the control loop. Connect a series RC network from this pin to GND. In some cases, an additional capacitor from this pin to GND pin is required Control input pin. Forcing this pin above 1.5V or set this pin floating enables the IC. Forcing this pin below 0.5V shuts down the IC. When the IC is in shutdown mode, all functions are disabled to decrease the supply current below 1µA Soft-start control input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 10ms. To disable the soft-start feature, leave SS disconnected Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter AP3203 Functional Block Diagram IN 2 Internal Bias and Regulator Internal Pull High VA Current Sense SLOP COMP Amplifier VB 5V Oscillator 90k/380k Shutdown Comparator EN Q R Q PWM Comparator 7 0.4/1.5V 3 SW M2 10 1.3V 4 VB Short Protection Comparator BS M1 0.12 CLK S 1 0.6 1.222 5 FB Error Amplifier GND 6 A 6 8 COMP SS Figure 3. Functional Block Diagram of AP3203 Ordering Information AP3203 - Circuit Type G1: Green Package MP: PSOP-8 Package Temperature Range PSOP-8 -40 to 85ºC TR: Tape & Reel Blank: Tube Part Number Marking ID Packing Type AP3203MP-G1 3203MP-G1 Tube AP3203MPTR-G1 3203MP-G1 Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter AP3203 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit IN Pin Voltage VIN -0.3 to 20 V EN Pin Voltage VEN -0.3 to VIN V SW Pin Voltage VSW 21 V BS Pin Voltage VBS -0.3 to VSW+6 V FB Pin Voltage VFB -0.3 to 6 V VCOMP -0.3 to 6 V SS Pin Voltage VSS -0.3 to 6 V Thermal Resistance θJA 105 ºC/W Operating Junction Temperature TJ 150 ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10sec) TLEAD 260 ºC ESD (Machine Model) 200 V ESD (Human Body Model) 2000 V COMP 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 18 V IOUT (Max) 3 TA -40 Maximum Output Current Operating Ambient Temperature Mar. 2011 Rev. 1. 0 A 85 ºC BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter AP3203 Electrical Characteristics VIN=VEN=12V, VOUT=3.3V, TA=25oC, unless otherwise specified. And those in boldface type apply over the full operating temperature rang (TA=-40ºC to +85ºC). Parameter Symbol Input Voltage VIN Quiescent Current IQ Shutdown Supply Current ISHDN Feedback Voltage Conditions Min Typ Max Unit 18 V 1.0 1.5 mA 1 10 µA 1.222 1.258 V 4.75 VEN=2V, VFB=1.35V VEN=0V VFB 1.185 Feedback Over Voltage Threshold VFBOV 1.48 V Feedback SCP Voltage Threshold VFB_SCP 0.6 V Feedback Bias Current -0.1 VFB= 1V Upper Switch On-resistance RDSONH ISW=0.5A 0.12 Ω Lower Switch On-resistance RDSONL ISW=0.05A 10 Ω High-side Switch Leakage Current ILEAKH VIN=18V, VEN=0V VSW=0V 0.1 High-side Switch Current Limit ILIMH Low-side Switch Current Limit ILIML 4 From Source Drain VENH EN Pin Threshold to 0.1 µA IFB 10 µA 5.2 A 0.15 A 1.5 V VENL 0.5 V µA EN Pull-up Current IEN_PH VEN=0V Input UVLO Threshold VUVLO VIN Rising Input UVLO Hysteresis VHYS 0.3 V Oscillator Frequency fOSC1 380 kHz Short Circuit Oscillator Frequency fOSC2 80 kHz Maximum Duty Cycle DMAX VFB=1.0V 90 % Minimum Duty Cycle DMIN VFB=1.35V Error Amplifier Voltage Gain (Note 3) AEA Error Amplifier Transconductance GEA COMP to Current Transconductance GCS 5.4 A/V Thermal Shutdown (Note 3) TOTSD 160 ºC Thermal Shutdown Hysteresis (Note 3) THYS 30 ºC 10 ms 6 µA Sense Soft-start Time (Note 3) tSS Soft-start Current ISS Mar. 2011 1.0 3.55 3.85 4.15 0 400 700 C4=0.1µF, IOUT=500mA Rev. 1. 0 950 V % V/V 1200 µA/V BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter Note 2: RDSON = AP3203 VSW 1 − VSW 2 I SW 1 − I SW 2 Note 3: Not tested, guaranteed by design. Typical Performance Characteristics TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted. 100 1.40 1.35 90 1.25 70 1.20 Quiescent Current (mA) Efficiency (%) 1.30 80 60 50 40 30 VIN=12V 20 VIN=5V 10 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 0.75 0 0.70 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -60 -40 -20 0 Output Current (A) 40 60 80 100 120 140 o Figure 4. Efficiency vs. Output Current Figure 5. Quiescent Current vs. Temperature 3.50 1.30 3.45 1.28 3.40 1.26 3.35 1.24 Feedback Volage (V) Output Voltage (V) 20 Temperature ( C) 3.30 3.25 3.20 3.15 3.10 3.05 1.22 1.20 1.18 1.16 1.14 1.12 3.00 1.10 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -60 Output Current (A) -20 0 20 40 60 80 100 120 140 o Temperature ( C) Figure 6. Output Voltage vs. Output Current Mar. 2011 -40 Figure 7. Feedback Voltage vs. Temperature Rev. 1. 0 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter AP3203 Typical Performance Characteristics (Continued) TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted. 18 170 Low-side Switch On-resistance (Ω) High-side Switch On-resistance (mΩ) 160 150 140 130 120 110 100 90 80 70 60 16 14 12 10 8 6 -60 -40 -20 0 20 40 60 80 100 120 140 -40 o -20 0 20 40 60 80 100 120 140 o Temperature ( C) Temperature ( C) Figure 8. RDSONH vs. Temperature Figure 9. RDSONL vs. Temperature IL 1A/div IL 1A/div VOUT(AC) 20mV/div VOUT(AC) 200mV/ di VSW 5V/div Time 10ms/div Time Time 400µs/div 2µs/div Figure 10. Output Ripple (VIN=12V,VOUT=3.3V, IOUT=3A) Mar. 2011 Figure 11. Load Transient (VIN=12V, VOUT=3.3V, IOUT=2A to 3A) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter AP3203 Typical Performance Characteristics (Continued) TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted. VEN 2V/div VOUT 1V/div VEN 2V/div IL 2A/div VOUT 1V/div IL 2A/div VSW 5V/div VSW 5V/div Time 10ms/div Time 10ms/div Figure 12. Enable Turn Off (VIN=12V,VOUT=3.3V, IOUT=3A, with Resister load) Figure 13. Enable Turn On (VIN=12V,VOUT=3.3V, IOUT=3A, with Resistance Load) VOUT 2V/div VOUT 2V/div IL 2A/div IL 2A/div VSW 5V/div VSW 5V/div Time 400µs/div Time 200µs/div Figure 14. Short Circuit Protection (VIN=12V, VOUT=3.3V, IOUT=3A) Mar. 2011 Figure 15. Short Circuit Recovery (VIN=12V, VOUT=3.3V, IOUT=3A) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter AP3203 Typical Application Figure 8. Typical Application of AP3203 Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet 380kHz, 3A Asynchronous DC - DC Buck Converter AP3203 Mechanical Dimensions Unit: mm(inch) 3.202(0.126) 3.402(0.134) PSOP-8 Mar. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 10 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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