Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter General Description Features The AP3417A is a 1.4MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 1A 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 AP3417A. This feature greatly simplifies the design of switch-mode power supplies. The AP3417A is available in SOT-23-5 package. AP3417A 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: 1A 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 • • • • Set-top Box Datacom Portable Device Smart Phone SOT-23-5 Figure 1. Package Type of AP3417A Aug. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A Pin Configuration K Package (SOT-23-5) EN 1 GND 2 SW 3 5 FB 4 VIN Figure 2. Pin Configuration of AP3417A (Top View) Pin Description Pin Number Aug. 2012 Pin Name Function 1 EN 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 2 GND 3 SW 4 VIN 5 FB Ground pin Power switch output pin. Inductor connection to drain of the internal PFET and NFET switches Supply input pin. Bypass to GND with a 4.7µF or greater ceramic capacitor 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 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A DRIVER Functional Block Diagram Figure 3. Functional Block Diagram of AP3417A Ordering Information AP3417A G1: Green Circuit Type TR: Tape & Reel K: SOT-23-5 Package SOT-23-5 Temperature Range -40 to 85 ºC Part Number AP3417AKTR-G1 Marking ID G4H 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. 2 BCD Semiconductor Manufacturing Limited 3 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A 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 VSW -0.3 to VIN+0.3 V Thermal Resistance θJA 265 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 2.5 5.5 V Operating Ambient Temperature TA -40 85 ºC Aug. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 4 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A Electrical Characteristics VIN=5V, TA=25ºC, unless otherwise specified. Parameters Symbol Input Voltage VIN Conditions Min Typ 2.5 Max Unit 5.5 V IQ VFB=0.65V 62 100 µA Shutdown Supply Current ISTBY VEN=GND 0.1 1 µA Reference Voltage VREF For Adjustable Output Voltage 0.6 0.612 V IFB_H VFB=1V -0.1 0.1 IFB_L VFB=0V -0.1 0.1 Quiescent Current 0.588 Feedback Bias Current µA PMOSFET RON RDS(ON)_ P ISW = 200mA 0.25 Ω NMOSFET RON RDS(ON) _N ISW = -200mA 0.2 Ω 1.8 A Switch Current Limit ILIM VFB=0.55V VH 1.3 1.5 EN Pin Threshold V VL 0.4 UVLO Threshold VUVLO VIN Rising 2.3 UVLO Hysteresis VHYS Oscillator Frequency FOSC 1.12 Max. Duty Cycle DMAX 100 Min. Duty Cycle DMIN V 0.2 1.40 1.68 MHz % 0 ISW_H VSW =0V 0.1 ISW_L VSW =5V 0.1 SW Leakage Current Soft-start Time µA tSS 1 ms Thermal Shutdown TOTSD 160 ºC Thermal Hysteresis THYS 20 ºC Aug. 2012 Shutdown Rev. 1. 2 BCD Semiconductor Manufacturing Limited 5 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A Typical Performance Characteristics VIN=5V, TA=25ºC, unless otherwise specified. 100 100 95 95 90 90 Efficiency (%) Efficiency (%) 85 80 75 70 85 80 75 65 70 60 VOUT = 1.8V 55 IOUT = 1.0A 50 2.5 3.0 3.5 4.0 4.5 5.0 VIN = 5.0V VOUT =1.8V 65 60 0.0 5.5 0.2 0.4 0.6 0.8 1.0 Output Current (A) Input Voltage (V) Figure 5. Efficiency vs. Output Current Figure 4. Efficiency vs. Input Voltage 2.4 0.64 2.3 0.63 VIN = 5.0V 2.2 Reference Voltage (V) Switch Current Limit (A) VIN = 5.0V 0.62 0.61 0.60 0.59 0.58 0.57 0.56 -40 2.0 1.9 1.8 1.7 1.6 1.5 -20 0 20 40 60 80 100 120 1.4 -40 140 -20 0 20 40 60 80 100 120 140 o o Temperature ( C) Temperature ( C) Figure 6. Reference Voltage vs. Temperature Aug. 2012 2.1 Figure 7. Switch Current Limit vs. Temperature Rev. 1. 2 BCD Semiconductor Manufacturing Limited 6 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A Typical Performance Characteristics (Continued) VIN=5V, TA=25ºC, unless otherwise specified. 1.7 1.70 1.65 1.5 Frequency (MHz) 1.55 Frequency (MHz) VIN = VEN = 5.0V 1.6 VIN = 5.0V 1.60 1.50 1.45 1.40 1.35 1.4 1.3 1.2 1.30 1.1 1.25 1.20 2.5 3.0 3.5 4.0 4.5 5.0 1.0 -40 5.5 -20 0 20 60 80 100 120 140 Temperature ( C) Figure 8. Frequency vs. Input Voltage Figure 9. Frequency vs. Temperature 0.32 0.40 0.38 VIN = 5.0V 0.36 0.28 ISW = 200mA NMOS RDS(ON)_DOWN (Ω) PMOS RDS(ON)_UP (Ω) 40 o Input Voltage (V) 0.34 0.32 0.30 0.28 0.26 0.24 0.22 0.24 0.20 0.16 0.12 VIN = 5.0V ISW = 200mA 0.08 0.20 0.18 -40 -20 0 20 40 60 80 100 120 0.04 -40 140 0 20 40 60 80 100 120 140 Temperature ( C) Temperature ( C) Figure 10. RDS (ON)_UP vs. Temperature Aug. 2012 -20 o o Figure 11. RDS (ON)_DOWN vs. Temperature Rev. 1. 2 BCD Semiconductor Manufacturing Limited 7 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A Typical Performance Characteristics (Continued) VIN=5V, TA=25ºC, unless otherwise specified. VOUT_AC 10mV/div VOUT_AC 10mV/div VSW 2V/div VSW 2V/div IL 1A/div IL 200mA/div Time 1µs/div Time 10ms/div Figure 12. Output Ripple (IOUT=0A) Figure 13. Output Ripple (IOUT=1A) VEN 5V/div VOUT 1V/div VEN 5V/div VOUT 1V/div VSW 2V/div VSW 2V/div IL 1A/div IL 1A/div Time 200µs/div Time 200µs/div Figure 14. Enable Turn on (IOUT=1A) Aug. 2012 Figure 15. Enable Turn off (IOUT=1A) Rev. 1. 2 BCD Semiconductor Manufacturing Limited 8 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A Typical Performance Characteristics (Continued) VIN=5V, TA=25ºC, unless otherwise specified. VOUT 1V/div VOUT 1V/div VSW 5V/div VSW 5V/div IL 1A/div IL 1A/div Time 10ms/div Time 10ms/div Figure 16. Short Circuit Protection (IOUT=1A) Aug. 2012 Figure 17. Short Circuit Protection Recovery (IOUT=1A) Rev. 1. 2 BCD Semiconductor Manufacturing Limited 9 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A Typical Application Figure 18. Typical Application of AP3417A Aug. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 10 Data Sheet 1A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3417A 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) Aug. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 11 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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