Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER General Description Features The AP3406 is a 1.1MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 650mA load with high efficiency, excellent line and load regulation. The device integrates a main switch and a synchronous switch without an external Schottky diode. 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 AP3406. This feature greatly simplifies the design of switch-mode power supplies. AP3406 High Efficiency: up to 95% Output Current: 650mA Input Voltage Range: 2.5V to 5.5V Fixed 1.1MHz Frequency Current Mode Control 100% Duty Cycle in Dropout Built-in Short Circuit Protection Built-in Thermal Shutdown Function Built-in Current Limit Function Shutdown Current: <1μA Applications This IC is available in TSOT-23-5 and SOT-23-5 packages. • • • • TSOT-23-5 GPS WiFi Card Portable Media Player Digital Still and Video Cameras SOT-23-5 Figure 1. Package Types of AP3406 Oct. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Pin Configuration KT/K Package TSOT-23-5/SOT-23-5 EN 1 GND 2 SW 3 5 FB 4 VIN Figure 2. Pin Configuration of AP3406 (Top View) Pin Description Pin Number Pin Name 1 EN 2 GND 3 SW Power switch output pin. Inductor connection to drain of the internal PFET and NFET switches 4 VIN Supply input pin. Bypass to GND with a 4.7μF or greater ceramic capacitor 5 FB Feedback pin. Connect it with an external resistor divider network to program the system output voltage Oct. 2009 Function Control input pin. Forcing this pin above 1.5V enables the IC. Forcing this pin below 0.6V shuts down the IC. When the IC is in shutdown mode, all functions are disabled to decrease the supply current below 1μA Ground pin Rev. 1. 4 BCD Semiconductor Manufacturing Limited 2 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Functional Block Diagram EN VIN 4 1 Shutdown Control Slope Compensation Oscillator VREF with Soft Start FB 5 Current Sense Current Limit Detector Control Logic 3 Driver SW 0.6V Error Amplifier PWM Comparator Over Temperature Detector 2 GND Figure 3. Functional Block Diagram of AP3406 Ordering Information AP3406 G1: Green Circuit Type TR: Tape & Reel Package KT: TSOT-23-5 K: SOT-23-5 Package Temperature Range ADJ: Adjustable Voltage Part Number Marking ID Green Green Packing Type TSOT-23-5 -40 to 85°C AP3406KT-ADJTRG1 L1B Tape & Reel SOT-23-5 -40 to 85°C AP3406K-ADJTRG1 FBC Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Oct. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 3 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage VIN -0.3 to 6 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 Operating Junction Temperature TJ 125 ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10sec) TLEAD 260 ºC TSOT-23-5 250 SOT-23-5 265 ºC/W 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 IOUT (MAX) 650 TA -40 Maximum Output Current Operating Ambient Temperature Oct. 2009 Rev. 1. 4 mA 85 ºC BCD Semiconductor Manufacturing Limited 4 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Electrical Characteristics VIN =VEN=3.6V, TA=25℃, unless otherwise specified. Specifications with boldface type apply over full operating temperature range from -40 to 85ºC. Parameters Symbol Supply Current ICC Shutdown Supply Current Under Voltage Threshold Under Voltage Hysteresis Lockout Lockout Conditions Typ Max Unit VFB=0.55V 400 600 μA ISHDN VEN=0V, VIN=5.5V 0.01 1 μA VUVLO Rising edge 2.27 V 200 mV VHUVLO Feedback Bias Current IFB VFB=0.65V Feedback Voltage VFB IOUT=100mA Maximum Output Current IOUT (MAX) Switch Current Limit ILIM Oscillator Frequency fOSC Soft-start Time VFB=0.55V 0.5 50 nA 0.588/ 0.582 0.600 0.612/ 0.618 V 650 mA 650 650 0.8 1.15 0.8 1.1 On On A 1.4 0.6 VENH EN Pin Input Leakage Current Maximum Duty Cycle VIN=2.5V, VOUT=0.9V VIN=3.6V, VOUT=1.2V VIN=4.6V, VOUT=3.3V -50 VENL EN Pin Threshold Internal PFET Resistance Internal NFET Resistance Min 1.5 MHz V IH VEN=3.6V -0.1 0.1 μA IL VEN=0V -0.1 0.1 μA RDSONP ISW=100mA 0.44 Ω RDSONN ISW=-100mA 0.29 Ω VFB=0.55V 100 % VEN=0V to VIN IOUT＝50mA 220 μs DMAX TSS Thermal Shutdown Threshold TOTSD 160 ºC Thermal Shutdown Hysteresis THYS 30 ºC Thermal Resistance (Junction to Case) Oct. 2009 θJC SOT-23-5 70 TSOT-23-5 70 Rev. 1. 4 ºC/W BCD Semiconductor Manufacturing Limited 5 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Typical Performance Characteristics L=10μH, COUT=10μF, TA=25oC, unless otherwise noted. 1.4 0.7 0.6 Supply Current (mA) Frequency (MHz) 1.3 1.2 1.1 1.0 VIN=3.6V VOUT=1.8V 0.9 2.5 3.0 3.5 4.0 4.5 5.0 0.4 VIN=3.6V 0.3 IOUT=0A 0.8 2.0 0.5 5.5 VFB=0.55V 0.2 -60 6.0 -40 -20 0 20 40 60 80 100 o Input Voltage (V) Temperature ( C) Figure 5. Supply Current vs. Temperature Figure 4. Frequency vs. Input Voltage 1.90 1.4 1.85 1.3 Output Voltage (V) Current Limit (A) 1.80 1.2 1.1 1.0 VIN=3.6V 1.70 1.65 1.60 VIN=3.6V 1.55 VFB=0.55V 0.9 1.75 VOUT=1.8V 1.50 0.8 -60 -40 -20 0 20 40 60 80 1.45 100 o Temperature ( C) 200 400 600 800 1000 1200 Output Current (mA) Figure 6. Current Limit vs. Temperature Oct. 2009 0 Figure 7. Output Voltage vs. Output Current Rev. 1. 4 BCD Semiconductor Manufacturing Limited 6 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Typical Performance Characteristics (Continued) 400ns/div VSW 2V/div VSW 2V/div VOUT 20mV/div VOUT 20mV/div 400ns/div 400ns/div Figure 8. Light Load Operation Figure 9. Heavy Load Operation (VIN=3.6V, VOUT=1.8V, IOUT=600mA) (VIN=3.6V, VOUT=1.8V, IOUT=0mA) IIN 500mA/div IOUT 500mA/div VOUT 1V/div VOUT 100mV/div VEN 5V/div 200μs/div 200μs/div Figure 10. Load Transient (VIN=3.6V, VOUT=1.8V, IOUT=0mA to 500mA) Oct. 2009 Figure 11. Start up from Shutdown (VIN=3.6V, VOUT=1.8V, RLOAD=4Ω) Rev. 1. 4 BCD Semiconductor Manufacturing Limited 7 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Typical Performance Characteristics (Continued) VOUT 1V/div VOUT 1V/div VSW 2V/div VSW 2V/div IL 500mA/div IL 500mA/div 4μs/div 80μs/div Figure 12. Short Circuit Protection (VIN=3.6V, VOUT=1.8V, no load) 100 100 90 90 80 80 L=2.2μH L=4.7μH L=10μH 60 50 40 30 50 40 VIN=3.6V 20 VOUT=3.3V 10 VOUT=1.8V 10 0 10 100 0 10 1000 100 1000 Output Current (mA) Output Current (mA) Figure 14. Efficiency vs. Output Current Oct. 2009 60 30 VIN=4.2V 20 L=2.2μH L=10μH 70 Efficiency (%) 70 Efficiency (%) Figure 13. Short Circuit Recovery (VIN=3.6V, VOUT=1.8V, no load) Figure 15. Efficiency vs. Output Current Rev. 1. 4 BCD Semiconductor Manufacturing Limited 8 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Typical Performance Characteristics (Continued) Normalized Feedback Voltage (%) 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 VIN=3.6V VOUT=1.8V -1.5 -2.0 -60 -40 -20 0 20 40 60 80 100 o Temperature ( C) Figure 16. Normalized Feedback Voltage vs. Temperature Typical Application Figure 17. Typical Application of AP3406 Oct. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 9 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Mechanical Dimensions SOT-23-5 Oct. 2009 Rev. 1. 4 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 10 Data Sheet 1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406 Mechanical Dimensions (Continued) 5° Oct. 2009 Rev. 1. 4 Unit: mm(inch) GAUGE PLANE TSOT-23-5 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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