Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER General Description Features The AP3211H 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 AP3211H. This feature greatly simplifies the design of switch-mode power supplies. AP3211H Input Voltage Range: 4.5V to 23V 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 AP3211H is available in SOT-23-6 package. • • • LCD TV DPF Portable DVD SOT-23-6 Figure 1. Package Type of AP3211H Aug. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H 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 AP3211H (Top View) Pin Description Pin Number Pin Name 1 BS 2 GND 3 FB 4 EN 5 IN 6 SW Aug. 2012 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 VFB＜0.25V, 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 1μA 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 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H Functional Block Diagram IN 5 SCHOTTKY FB CL GND 2 SS HICCUP 1 BOOSTRAP REGULATOR BS 2A/V OSC 1.4 MHz/ 460 KHz VDD/VDD1 REGULATOR VREF RAMP GENERATOR CS OSC 1pF S Q VLIMIT EN 4 3.3V CL REFERENCE VOLTAGE 27pF 1M 220k 6 SW R SS FB SWITCH / LDO R ERR AMP 3 PWM COMPARATOR Figure 3. Functional Block Diagram of AP3211H Ordering Information AP3211H - Circuit Type G1: Green Package K: SOT-23-6 TR: Tape & Reel Package Temperature Range SOT-23-6 -40 to 85°C Part Number AP3211HKTR-G1 Marking ID GBK Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Aug. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Pin Voltage VIN -0.3 to 25 V EN Pin Voltage VEN -0.3 to VIN+0.3 V SW Pin Voltage VSW 26 V Bootstrap Pin Voltage VBS -0.3 to VSW+6 V Feedback Pin Voltage VFB -0.3 to 6 V TJ 150 ºC TSTG -65 to 150 ºC TLEAD 260 ºC θJA 220 ºC/W Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10sec) Thermal Resistance (Junction to Ambient) 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 23 V Operating Ambient Temperature TA -40 85 ºC Aug. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H Electrical Characteristics VIN=VEN=12V, VOUT=3.3V, TA=25ºC, unless otherwise specified. Parameter Symbol Input Voltage VIN Quiescent Current IQ Shutdown Supply Current ISHDN Feedback Voltage VFB Feedback Over Voltage Threshold VFBOV Feedback Bias Current IFB Conditions Min 4.5 VEN=0V 0.1 1.0 µA 0.810 0.835 V 0.785 0.972 VFB=0.85V -0.1 ILEAK VIN=23V, VEN=0V Switch Current Limit ILIM 1.8 VENH 1.5 Oscillator Frequency V 0.1 0.385 0.1 10 3.3 3.8 4.3 0.2 fOSC1 1.1 1.4 µA A 0.4 VIN Rising µA Ω 2.4 VENL VHYS V mA Switch Leakage Current Input UVLO Hysteresis 23 1.1 ISW=1A VUVLO Unit 0.8 RDSON Input UVLO Threshold Max VFB=0.9V Switch On-resistance EN Pin Threshold Typ V 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 ºC Thermal Shutdown Hysteresis THYS 20 ºC tSS 200 µs Soft-start Time Note 2: RDSON , tON, TOTSD, THYS and tSS are guaranteed by design. Aug. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H Typical Performance Characteristics TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted. 100 1.00 90 0.96 80 Quiescent Current (mA) 0.92 Efficiency (%) 70 60 50 40 30 20 0.88 0.84 0.80 0.76 0.72 10 0 0.01 0.1 0.68 -60 1 -40 -20 0 Output Current (A) 3.40 0.88 3.36 0.80 3.32 Output Voltage (V) Feedback Voltage (V) 60 80 100 120 140 160 Figure 5. Quiescent Current vs. Case Temperature 0.96 0.72 0.64 0.56 0.48 3.28 3.24 3.20 3.16 -40 -20 0 20 40 60 80 100 120 140 3.12 0.0 160 o 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Output Current (A) Case Temperature ( C) Figure 6. Feedback Voltage vs. Case Temperature Aug. 2012 40 o Figure 4. Efficiency vs. Output Current 0.40 -60 20 Case Temperature ( C) Figure 7. Output Voltage vs. Output Current Rev. 1. 0 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H Typical Performance Characteristics (Continued) TA=25ºC, VIN=12V, VOUT=3.3V, unless otherwise noted. VOUT_AC (10mV/div) IL (500mA/div) VSW (5V/div) VOUT_AC (100mV/div) IOUT (500mA/div) Time (400ns/div) Time (200μs/div) Figure 8. Output Ripple (IOUT=1.5A) Figure 9. Load Transient (IOUT=1A to 1.5A) VEN (5V/div) VOUT (2V/div) VEN (5V/div) VOUT (2V/div) VSW (5V/div) VSW (5V/div) Time (40μs/div) Time (100μs/div) Figure 10. Enable Turn on Characteristic Aug. 2012 Figure 11. Enable Turn off Characteristic Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H 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) VSW (5V/div) VSW (5V/div) Time (100μs/div) Time (100μs/div) Figure 12. Short Circuit Protection (IOUT=1A) Aug. 2012 Figure 13. Short Circuit Recovery (IOUT=1A) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H Typical Application VIN=12V 5 IN AP3211H C1 10 F 25V 4 ON OFF EN 1 BS CB 10nF L1 4.7 H 6 SW D1 R1 49.9kΩ VOUT=3.3V (1.5A) C2 22 F 6.3V 3 FB GND R2 16.2kΩ 2 Figure 14. Typical Application Circuit of AP3211H Aug. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet 1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER AP3211H Mechanical Dimensions SOT-23-6 Unit: mm(inch) 0° 2.820(0.111) 8° 3.020(0.119) 0.300(0.012) 0.400(0.016) 5 4 2 3 0.300(0.012) 0.600(0.024) 1.500(0.059) 1.700(0.067) 2.650(0.104) 2.950(0.116) 6 0.200(0.008) 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) Aug. 2012 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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