Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A General Description Features The AP3407/A is a 1.4MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 1.2A load with high efficiency, excellent line and load regulation. The device integrates synchronous P-channel and N-channel power MOSFET switches with low on-resistance. It is ideal for powering portable equipment that runs from a single Li-ion battery. • • • • • • • • • • • • • A standard series of inductors are available from several different manufacturers optimized for use with the AP3407/A. This feature greatly simplifies the design of switch-mode power supplies. The AP3407/A is available in SOT-23-5. Input Voltage Range: 2.5V to 5.5V Output Voltage: 0.6V to VIN ADJ Output Fixed 1.4MHz Frequency High Efficiency up to 95% Output Current: 1.2A Current Mode Control 100% Duty Cycle in Dropout Built-in Over Current Protection Built-in Short Circuit Protection Built-in Thermal Shutdown Protection Built-in UVLO Function Built-in Soft-start Applications • • • Datacom Portable Device Smart Phone SOT-23-5 Figure 1. Package Type of AP3407/A Dec. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Pin Configuration K Package (SOT-23-5) EN 1 GND 2 SW 3 5 4 FB VIN (For AP3407) VIN 1 GND 2 EN 3 5 SW 4 FB (For AP3407A) Figure 2. Pin Configuration of AP3407/A (Top View) Pin Description Pin Number Pin Name AP3407 Function AP3407A 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 1.2A Ground pin 1 3 EN 2 2 GND 3 5 SW Power switch output pin. Inductor connection to drain of the internal PFET and NFET switches 4 1 VIN Supply input pin. Bypass to GND with a 4.7µF or greater ceramic capacitor FB This is the feedback pin of the device. Connect this pin directly to the output if the fixed output voltage version is used. For the adjustable version an external resistor divider is connected to this pin. 5 Dec. 2011 4 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 2 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Functional Block Diagram Figure 3. Functional Block Diagram of AP3407/A Dec. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 3 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Ordering Information AP3407 G1: Green Circuit Type TR: Tape & Reel Blank: AP3407 A: AP3407A K: SOT-23-5 Package Temperature Range SOT-23-5 -40 to 85 ºC Part Number Marking ID Green Green AP3407KTR-G1 AP3407AKTR-G1 GJA GJB Packing Type Tape & Reel Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage VIN -0.3 to 6.0 V Feedback Voltage VFB -0.3 to VIN +0.3 V EN Pin Voltage VEN -0.3 to VIN+0.3 V SW Pin Voltage Thermal Resistance Thermal Resistance Power Dissipation Operating Junction Temperature VSW θJA θJC PD TJ -0.3 to VIN+0.3 265 60 0.377 150 V ºC/W ºC/W W ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10sec) TLEAD 260 ºC 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. Note 2: The junction temperature rise is given by TRISING=PD*θJA, where PD is the power dissipated by regulator, θJA is the thermal resistance from junction of the die to the ambient temperature; The junction temperature, TJ is given by TJ=TA+TR, where TA is the ambient temperature. Dec. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 4 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Recommended Operating Conditions Parameter Symbol Min Max Unit Input Voltage VIN 2.5 5.5 V IOUT (MAX) 1.2 TA -40 Maximum Output Current Operating Ambient Temperature A 85 ºC Electrical Characteristics VIN=VDD =VPVDD=3.3V, TA=25℃, unless otherwise specified. Parameters Symbol Input Voltage VIN Quiescent Current Shutdown Supply Current Conditions Typ 2.5 Max Unit 5.5 V IQ VFB=0.65V 62 100 µA ISTBY VEN=GND 0.1 1 µA 0.6 0.612 V -0.1 0.1 µA -2 2 % Reference Voltage VREF For Adjustable Output Voltage Feedback Bias Current IFB VFB=VIN Output Voltage Accuracy Min ∆VOUT 0.588 PMOSFET RON RDS(ON)_ P ISW = 200mA 0.28 Ω NMOSFET RON RDS(ON) _N ISW = -200mA 0.25 Ω 2.0 A Switch Current Limit ILIM VFB=0.55V VH 1.5 1.5 EN Pin Threshold V VL UVLO Threshold VUVLO UVLO Hysteresis VHYS Oscillator Frequency fOSC 0.4 VDD Rising 2.3 V 0.2 1.12 Max. Duty Cycle DMAX VFB=0V Min. Duty Cycle DMIN VFB=6.5V 1.40 1.68 MHz 100 % N-MOS Current SW Leakage 0 0.1 µA t 1 ms Thermal Shutdown TOTSD 160 ºC Thermal Hysteresis THYS 20 ºC Soft-start Time Dec. 2011 Shutdown VIN=3.3V, VSW=3.3V Rev. 1. 3 BCD Semiconductor Manufacturing Limited 5 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Typical Performance Characteristics 100 95 96 90 80 Efficiency (%) Efficiency (%) 85 75 70 65 60 88 80 VOUT=2.5V 55 50 VIN=3.3V 45 VOUT=2.5V 40 200 400 600 800 IOUT=0.5A 72 1000 IOUT=1.0A 2 1200 3 4 5 6 Input Voltage (V) Output Current (mA) Figure 5. Efficiency vs. Input Voltage Figure 4. Efficiency vs. Output Current 1.8 2.51 2.50 Frequency (MHz) Output Voltage (V) 1.7 2.49 2.48 VIN=3.3V 1.6 1.5 1.4 IOUT=300mA VOUT=2.5V 2.47 1.3 200 400 600 800 1000 1200 2.5 Output Current (mA) 3.5 4.0 4.5 5.0 5.5 6.0 6.5 Input Voltage (V) Figure 6. Output Voltage vs. Output Current Dec. 2011 3.0 Figure 7. Frequency vs. Input Voltage Rev. 1. 3 BCD Semiconductor Manufacturing Limited 6 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Typical Performance Characteristics (Continued) 1.7 0.62 0.61 Feedback Voltage (V) Frequency (MHz) 1.6 1.5 1.4 1.3 VIN=3.3V 0.60 0.59 0.58 VOUT=2.5V VIN=3.3V 1.2 -40 0 40 80 120 0.57 160 -40 0 40 O Temperature ( C) 120 160 Figure 9. Feedback Voltage vs. Temperature 2.2 0.5 2.0 0.4 1.8 0.3 RDS(ON)-UP (Ω) OCP Current Limit (A) Figure 8. Frequency vs. Temperature 1.6 1.4 80 O Temperature ( C) 0.2 0.1 VIN=3.3V VIN=3.3V VFB=0.55V ISW=200mA 1.2 0.0 -40 0 40 80 120 160 -40 O 40 80 120 160 Temperature ( C) Figure 10. OCP Current Limit vs. Temperature Dec. 2011 0 O Temperature ( C) Figure 11. RDS (ON)_UP vs. Temperature Rev. 1. 3 BCD Semiconductor Manufacturing Limited 7 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Typical Performance Characteristics (Continued) 0.32 RDS(ON)-Low (Ω) 0.28 0.24 0.20 0.16 VIN=3.3V ISW=200mA 0.12 -40 0 40 80 120 160 O Temperature ( C) Figure 12. RDS (ON)_LOW vs. Temperature Dec. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 8 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Typical Application R2 VIN EN R1 FB SW AP3407/A-ADJ CIN VOUT L VIN 2.2 H COUT F GND F Figure 13. Typical Application of AP3407/A Dec. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited 9 Data Sheet 1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A Mechanical Dimensions SOT-23-5 Unit: mm(inch) 2.820(0.111) 3.020(0.119) 0.100(0.004) 0.200(0.008) 0.200(0.008) 0.700(0.028) REF 0.950(0.037) TYP 0.300(0.012) 0.400(0.016) 0° 8° 1.800(0.071) 2.000(0.079) 0.000(0.000) 0.150(0.006) 0.900(0.035) 1.300(0.051) Dec. 2011 Rev. 1. 3 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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