Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter General Description Features The AP3202 is a 380kHz fixed frequency, current mode, PWM buck (step-down) DC-DC converter, capable of driving a 2A load with high efficiency, excellent line and load regulation. The device integrates N-channel power MOSFET switch with low on-resistance. 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 AP3202. This feature greatly simplifies the design of switch-mode power supplies. AP3202 Input Voltage Range: 4.75V to 18V Fixed 380kHz Frequency High Efficiency: up to 93% Output Current: 2A Current Mode Control Built-in Over Current Protection Built-in Thermal Shutdown Function Built-in UVLO Function Built-in Over Voltage Protection Built-in Soft-start Applications This IC is available in SOIC-8 package. • • • • LCD TV Set Top Box Portable DVD Digital Photo Frame SOIC-8 Figure 1. Package Type of AP3202 Mar. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 Pin Configuration M Package (SOIC-8) Figure 2. Pin Configuration of AP3202 (Top View) Pin Description Pin Number Pin Name 1 BS 2 IN 3 SW 4 GND 5 FB 6 COMP 7 EN 8 NC 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 power MOSFET Supply input pin. A capacitor should be connected between the IN pin and GND pin to keep the 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 No Connection Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 Functional Block Diagram IN 2 Internal Bias And Regulator INTERNAL PULL HIGH SLOP COMP Current Sense Amplifier 5V Oscillator 90k/380k Shutdown Comparator EN Q R Q PWM Comparator 7 0.5/1.5V BS 3 SW M1 0.22 CLK S 1 M2 10 1.8V 4 Short Protection Comparator 0.6 GND 1.222 Error Amplifier 6 5 FB 8 NC COMP Figure 3. Functional Block Diagram of AP3202 Ordering Information AP3202 - Circuit Type G1: Green Package M: SOIC-8 Package Temperature Range SOIC-8 -40 to 85°C TR: Tape & Reel Blank: Tube Part Number Marking ID Packing Type AP3202M-G1 3202M-G1 Tube AP3202MTR-G1 3202M-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. 2 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 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 20 V BS Pin Voltage VBS -0.3 to VSW+6 V FB Pin Voltage VFB -0.3 to 6 V COMP Pin Voltage VCOMP -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 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) 2 TA -40 Maximum Output Current Operating Ambient Temperature Mar. 2011 Rev. 1. 2 A 85 ºC BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 Electrical Characteristics VIN=VEN=12V, VOUT=3.3V, unless otherwise specified. Specification with standard typeface are for TA=25oC, and those in boldface type apply over the full operating temperature range (TA=-40oC to 85oC) Parameter Symbol Input Voltage VIN Quiescent Current IQ Shutdown Supply Current ISHDN Conditions Min Typ Max Unit 18 V 1.0 1.5 mA 1 10 µA 1.222 1.258 V 4.75 VFB=1.4V, VEN=2V VEN=0V Feedback Voltage VFB Feedback Over Voltage Threshold VFBOV 1.48 V Feedback SCP Voltage Threshold VFBSCP 0.6 V Feedback Bias Current 1.185 VFB=1V High-side Switch On-resistance (Note 2) RDSONH ISW=0.5A 0.22 Ω Low-side Switch On-resistance (Note 2) 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 EN Pin Threshold -0.1 2.8 From drain to source VENH 0.1 µA IFB 10 µA 3.8 A 0.15 A 1.5 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 90 kHz Maximum Duty Cycle DMAX VFB=1.0V 90 % Minimum Duty Cycle DMIN VFB=1.5V Error Amplifier Voltage Gain (Note 3) AEA 400 V/V Error Amplifier Transconductance GEA 700 µA/V COMP to Current Sense Transconductance GCS 2.4 A/V Thermal Shutdown (Note 3) TOTSD 160 ºC Thermal Shutdown Hysteresis (Note 3) THYS 30 ºC 500 µs Soft-start Time (Note 3) Note 2: RDSON= tSS IOUT=0A 1.0 3.5 3.9 4.4 0 V % VSW1 - VSW2 ISW1 - ISW2 Note 3: Not tested, guaranteed by design. Mar. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 Typical Performance Characteristics TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted. 375 90 350 High-side Switch On-resistance (mΩ) 100 Efficiency (%) 80 70 60 50 40 30 20 VIN=5V 10 VIN=12V 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 325 300 275 250 225 200 175 150 125 -40 2.0 -20 0 20 60 80 100 120 140 o Output Current (A) Figure 4. Efficiency vs. Output Current Figure 5. RDSONH vs. Case Temperature 1.30 20 18 1.25 16 Feedback Voltage (V) Low-side Switch On-resistance (Ω) 40 Case Temperature ( C) 14 12 10 1.20 1.15 1.10 8 1.05 6 4 -40 -20 0 20 40 60 80 100 120 1.00 -60 140 -20 0 20 40 60 80 100 120 140 Case Temperature ( C) Figure 6. RDSONL vs. Case Temperature Mar. 2011 -40 o o Case Temperature ( C) Figure 7. Feedback Voltage vs. Case Temperature Rev. 1. 2 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 Typical Performance Characteristics (Continued) 1.5 3.50 1.4 3.45 1.3 3.40 Output Voltage (V) Quiescent Current (mA) TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted. 1.2 1.1 1.0 0.9 3.35 3.30 3.25 3.20 0.8 3.15 0.7 3.10 0.6 3.05 0.5 -60 -40 -20 0 20 40 60 80 100 120 3.00 0.0 140 Case Temperature ( C) Figure 8. Quiescent Current vs. Case Temperature 1.0 1.5 2.0 Figure 9. Output Voltage vs. Output Current VEN 2V/div VOUT 1V/div VEN 2V/div VOUT 1V/div IL 1A/div IL 1A/div VSW 10V/div VSW 10V/div Time (10ms/div) Time (10ms/div) Figure 10. Enable Turn on Characteristic (IOUT=2A, CC Mode) Mar. 2011 0.5 Output Current (A) o Figure 11. Enable Turn off Characteristic (IOUT=2A, CC Mode) Rev. 1. 2 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 Typical Performance Characteristics (Continued) TA=25oC, VIN=12V, VOUT=3.3V, unless otherwise noted. VOUT 2V/div VOUT 2V/div IL 1A/div IL 1A/div VEN 2V/div VSW 5V/div VEN 2V/div VSW 5V/div Time (400µs/div) Time (800µs/div) Figure 12. Enable Turn on Characteristic (IOUT=2A, Resistance Load) Figure 13. Enable Turn off Characteristic (IOU T=2A, Resistance Load) VOUT 2V/div VOUT 2V/div IL 1A/div IL 1A/div VSW 5V/div VSW 5V/div Time (100µs/div) Time (100µs/div) Figure 14. Short Circuit Protection (IOUT=2A) Mar. 2011 Figure 15. Short Circuit Recovery (IOUT=2A) Rev. 1. 2 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 Typical Application Figure 16. Typical Application of AP3202 Mar. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet 380kHz, 2A Asynchronous DC-DC Buck Converter AP3202 Mechanical Dimensions SOIC-8 4.700(0.185) 5.100(0.201) 7° Unit: mm(inch) 0.320(0.013) 1.350(0.053) 1.750(0.069) 8° 8° 7° 0.675(0.027) 0.725(0.029) D 5.800(0.228) 1.270(0.050) 6.200(0.244) TYP D 20:1 0.800(0.031) 0.300(0.012) R0.150(0.006) 0.100(0.004) 0.200(0.008) 0° 8° 1.000(0.039) 3.800(0.150) 4.000(0.157) 0.330(0.013) 0.190(0.007) 0.250(0.010) 1° 5° 0.510(0.020) 0.900(0.035) R0.150(0.006) 0.450(0.017) 0.800(0.031) Note: Eject hole, oriented hole and mold mark is optional. 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