Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER General Description Features The AP3211 is a 1.4MHz fixed frequency, current mode, PWM buck (step-down) DC-DC converter, capable of driving a 1.5A 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 AP3211. This feature greatly simplifies the design of switch-mode power supplies. AP3211 Input Voltage Range: 4.5V to 18V Output Voltage Adjustable from 0.81V to 15V Fixed 1.4MHz Frequency High Efficiency: up to 92% Output Current: 1.5A 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 The AP3211 is available in SOT-23-6 package. * * * LCD TV DPF Portable DVD SOT-23-6 Figure 1. Package Type of AP3211 Apr. 2013 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Pin Configuration K Package (SOT-23-6) Pin 1 Mark BS 1 6 SW GND 2 5 IN FB 3 4 EN Figure 2. Pin Configuration of AP3211 (Top View) Pin Description Pin Number Pin Name 1 BS 2 GND 3 FB 4 EN 5 IN 6 SW Apr. 2013 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 Ground pin Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. When VFB exceeds 20% of the nominal regulation value of 0.81V, the OVP is triggered. When VFB0.25V, the oscillator frequency is lowered to realize short circuit protection Control input pin. Forcing this pin above 1.5V enables the IC. Forcing this pin below 0.4V shuts down the IC. When the IC is in shutdown mode, all functions are disabled to decrease the supply current below 1A Supply input pin. A capacitor should be connected between the IN pin and GND to keep the DC input voltage constant Power switch output pin. This pin is connected to the inductor and bootstrap capacitor Rev. 1. 4 BCD Semiconductor Manufacturing Limited 2 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Functional Block Diagram Figure 3. Functional Block Diagram of AP3211 Ordering Information AP3211 - Circuit Type G1: Green Package K: SOT-23-6 TR: Tape & Reel Package Temperature Range Part Number Marking ID Packing Type SOT-23-6 -40 to 85C AP3211KTR-G1 GCI Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Apr. 2013 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 3 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Pin Voltage VIN -0.3 to 20 V EN Pin Voltage VEN -0.3 to VIN+0.3 V SW Pin Voltage VSW 21 V Bootstrap Pin Voltage VBS -0.3 to VSW+6 V Feedback Pin Voltage VFB -0.3 to 6V V Thermal Resistance JA 220 C/W Operating Junction Temperature TJ 150 C Storage Temperature TSTG -65 to 150 C Lead Temperature (Soldering, 10sec) TLEAD 260 C ESD (Human Body Model) 2000 V ESD (Machine Model) 200 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 4.5 18 V IOUT (MAX) 1.5 TA -40 Maximum Output Current Operating Ambient Temperature Apr. 2013 Rev. 1. 4 A 85 C BCD Semiconductor Manufacturing Limited 4 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Electrical Characteristics VIN=VEN=12V, VOUT=3.3V, TA=25C, unless otherwise specified. Parameter Input Voltage Quiescent Current Symbol VIN IQ Shutdown Supply Current ISHDN Feedback Voltage VFB Feedback Over Voltage Threshold VFBOV Feedback Bias Current Conditions IFB Min Typ 4.5 mA VEN=0V 0.1 1.0 A 0.810 0.835 V 0.785 0.972 VFB=0.85V -0.1 Switch Leakage Current ILEAK VIN=18V, VEN=0V 0.1 Switch Current Limit ILIM 1.8 VENH 1.5 Oscillator Frequency A 10 2.4 A A V VENL VHYS V 0.1 0.35 Input UVLO Hysteresis V 1.1 ISW=1A VUVLO 18 0.8 RDSON Input UVLO Threshold Unit VFB=0.9V Switch On-resistance EN Pin Threshold Max 0.4 VIN Rising 3.3 3.8 4.3 0.2 fOSC1 1.1 1.4 V V 1.7 MHz fOSC2 Short Circuit 460 kHz Max. Duty Cycle DMAX VFB=0.6V 90 % Min. Duty Cycle DMIN VFB=0.9V 0 % Minimum On Time tON 100 ns Thermal Shutdown TOTSD 160 C Thermal Shutdown Hysteresis THYS 20 C tSS 200 s Soft-start Time Note 2: RDSON , tON, TOTSD, THYS and tSS are guaranteed by design. Apr. 2013 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 5 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Typical Performance Characteristics TA=25C, VIN=12V, VEN=5V, VOUT=3.3V, unless otherwise noted. 1.10 90 1.05 80 1.00 Quiescent Current (mA) 100 Efficiency (%) 70 60 50 40 30 VIN=12V,VOUT=3.3V 20 VIN=12V,VOUT=5V 10 0 0.01 0.1 0.5 1 0.95 0.90 0.85 0.80 0.75 VIN=12V 0.70 VFB=0.9V 0.65 VEN=5V 0.60 -60 2 -40 -20 0 20 40 60 80 100 120 140 160 o Temperature ( C) Output Current (A) Figure 4. Efficiency vs. Output Current Figure 5. Quiescent Current vs. Temperature 3.8 0.96 3.6 0.88 Output Voltage (V) Feedback Voltage (V) 3.4 0.80 0.72 0.64 0.56 0.48 3.2 3.0 2.8 2.6 VIN=12V, VOUT=3.3V 2.4 0.40 -60 -40 -20 0 20 40 60 80 100 120 140 2.2 0.0 160 Temperature ( C) Figure 6. Feedback Voltage vs.Temperature Apr. 2013 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 Output Current (A) o Figure 7. Output Voltage vs. Output Current Rev. 1. 4 BCD Semiconductor Manufacturing Limited 6 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Typical Performance Characteristics (Continued) TA=25C, VIN=12V, VEN=5V, VOUT=3.3V, unless otherwise noted. 3.8 3.0 3.7 2.8 2.6 Maximum Output Current (A) 3.6 Output Voltage (V) 3.5 3.4 3.3 3.2 3.1 3.0 2.9 IOUT=1.2A 2.8 IOUT=1.5A 2.7 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 VOUT=3.3V 0.6 0.4 0.2 2.6 4 6 8 10 12 14 16 18 4 20 Figure 8. Output Voltage vs. Input Voltage VOUT (AC) 20mV/div VSW 5V/div 8 10 12 14 16 18 20 Figure 9. Maximum Output Current vs. Input Voltage VOUT (AC) 100mV/div IL 1A/div IL 1A/div VIN 10V/div Time (100s/div) Time (400ns/div) Figure 10. Output Ripple (IOUT=1.5A) Apr. 2013 6 Input Voltage (V) Input Voltage (V) Figure 11.Load Transient (IOUT=1 to 1.5A) Rev. 1. 4 BCD Semiconductor Manufacturing Limited 7 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Typical Performance Characteristics (Continued) TA=25C, VIN=12V, VEN=5V, VOUT=3.3V, unless otherwise noted. VEN 3.4V/div VOUT 1V/div VEN 3.8V/div VOUT 1V/div VSW 5V/div VSW 5V/div IL 1A/div IL 1A/div Time (10s/div) Time (100s/div) Figure 12. Enable Turn-on Characteristic (Resistance Load, RLOAD=2.6) Figure 13. Enable Turn-off Characteristic (Resistance Load, RLOAD=2.6) VOUT 2V/div VOUT 2V/div VFB 1V/div VFB 1V/div IL 1A/div IL 1A/div VSW 10V/div VSW 10V/div Time (400s/div) Time (400s/div) Figure 15.Short Circuit Recovery (RLOAD=2.6) Figure 14. Short Circuit Protection (IOUT=1.5A) Apr. 2013 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 8 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Typical Performance Characteristics (Continued) TA=25C, VIN=12V, VEN=5V, VOUT=3.3V, unless otherwise noted. VFB 500mV/div VFB 500mV/div VOUT 2V/div IL 1A/div VOUT 2V/div IL 1A/div VSW 10V/div VSW 10V/div Time (200s/div) Time (20s/div) Figure 16. Over Voltage Protection (IOUT=1.5A) Apr. 2013 Figure 17. Over Voltage Recovery (IOUT=1.5A) Rev. 1. 4 BCD Semiconductor Manufacturing Limited 9 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Typical Application Figure 18. Typical Application Circuit of AP3211 Apr. 2013 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 10 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Mechanical Dimensions SOT-23-6 Unit: mm(inch) 0 2.820(0.111) 8 3.100(0.122) 0.300(0.012) 0.500(0.020) 6 0.200(0.008) 5 4 2 3 0.300(0.012) 0.600(0.024) Pin 1 Mark 1 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) Apr. 2013 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 11 Data Sheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211 Mounting Pad Layout SOT-23-6 Dimensions Value Apr. 2013 Z (mm)/(inch) 3.600/0.142 G (mm)/(inch) 1.600/0.063 X (mm)/(inch) 0.700/0.028 Rev. 1. 4 Y (mm)/(inch) 1.000/0.039 E (mm)/(inch) 0.950/0.037 BCD Semiconductor Manufacturing Limited 12 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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