Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER General Description Features The AP3406A is a 1.1MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 800mA 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 AP3406A. This feature greatly simplifies the design of switch-mode power supplies. High Efficiency: up to 95% Output Current: 800mA 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, MSOP-10 and DFN-2×2-6(1) packages. TSOT-23-5 AP3406A • • • • MSOP-10 GPS WiFi Card Portable Media Player Digital Still and Video Cameras DFN-2×2-6(1) Figure 1. Package Types of AP3406A Sep 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Pin Configuration KT Package MM Package TSOT-23-5 MSOP-10 DN Package DFN-2×2-6(1) Pin 1 Mark EN GND 2 SW 3 1 10 NC 2 9 SW GND 3 8 EN NC 4 7 NC FB 5 6 NC VIN 4 PGND VIN FB 5 1 NC 1 6 FB EN 2 5 GND VIN 3 4 SW Figure 2. Pin Configuration of AP3406A (Top View) Pin Description Pin Number TSOT-23-5 MSOP-10 Pin Name 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 DFN-2×2-6(1) 1 8 2 EN 2 3 5 GND 3 9 4 SW 4 1 3 VIN 5 5 6 FB 2, 4, 6, 7 1 NC 10 Sep 2011 PGND Rev. 1. 4 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 10μF or greater ceramic capacitor Feedback pin. Connect it with an external resistor divider network to program the system output voltage No connection Power ground pin BCD Semiconductor Manufacturing Limited 2 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Functional Block Diagram Figure 3. Functional Block Diagram of AP3406A Ordering Information AP3406A G1: Green Circuit Type Package Package TR: Tape & Reel KT: TSOT-23-5 MM: MSOP-10 DN: DFN-2×2-6(1) ADJ: Adjustable Voltage Temperature Range Part Number AP3406AKT-ADJTRG1 L2A Tape & Reel -40 to 85°C AP3406AMM-ADJTRG1 3406AMM-G1 Tape & Reel AP3406ADN-ADJTRG1 BA Tape & Reel TSOT-23-5 MSOP-10 DFN-2×2-6(1) Marking ID Packing Type BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Sep 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 3 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A 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 Operating Junction Temperature θJA TSOT-23-5 250 MSOP-10 135 DFN-2×2-6(1) 100 ºC/W TJ 150 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. Recommended Operating Conditions Parameter Symbol Min Max Unit Input Voltage VIN 2.5 5.5 V IOUT (MAX) 800 TA -40 Maximum Output Current Operating Ambient Temperature Sep 2011 Rev. 1. 4 mA 85 ºC BCD Semiconductor Manufacturing Limited 4 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A 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 800 mA 800 800 0.95 1.25 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 Sep 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 5 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Typical Performance Characteristics L=10μH, CIN=COUT=10μF, TA=25oC, unless otherwise noted. 0.7 1.4 0.6 Supply Current (mA) Frequency (MHz) 1.3 1.2 1.1 1.0 0.5 0.4 VIN=3.6V 0.3 VOUT=1.8V 0.9 VIN=3.6V IOUT=0A 0.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VFB=0.55V 0.2 -60 6.0 -40 -20 0 Input Voltage (V) 40 60 80 100 120 140 160 o Figure 5. Supply Current vs. Temperature Figure 4. Frequency vs. Input Voltage 2.0 2.0 1.8 1.8 1.6 1.6 1.4 1.4 Output Voltage (V) Current Limit (A) 20 Temperature ( C) 1.2 1.0 0.8 1.2 1.0 0.8 0.6 0.6 0.4 VIN=3.6V 0.2 VFB=0.55V 0.0 -60 -40 -20 0 20 40 60 80 VOUT=1.8V 0.2 0.0 0.0 100 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Output Current (A) O Temperature ( C) Figure 6. Current Limit vs. Temperature Sep 2011 VIN=3.6V 0.4 Figure 7. Output Voltage vs. Output Current Rev. 1. 4 BCD Semiconductor Manufacturing Limited 6 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A 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=800mA) (VIN=3.6V, VOUT=1.8V, IOUT=0mA) IIN 500mA/div IOUT 500mA/div VOUT 2V/div VOUT 100mV/div VEN 2V/div 200μs/div 400μs/div Figure 10. Load Transient (VIN=3.6V, VOUT=1.8V, IOUT=0mA to 800mA) Sep 2011 Figure 11. Start up from Shutdown (VIN=3.6V, VOUT=1.8V, RLOAD=2.5Ω) Rev. 1. 4 BCD Semiconductor Manufacturing Limited 7 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Typical Performance Characteristics (Continued) VOUT 1V/div VOUT 1V/div VSW 2V/div VSW 2V/div IL 1A/div IL 1A/div 10μs/div 40μs/div Figure 12. Short Circuit Protection (VIN=3.6V, VOUT=1.8V, no load) Figure 13. Short Circuit Recovery (VIN=3.6V, VOUT=1.8V, no load) 1.0 1.0 0.9 0.9 0.8 0.8 TSOT-23-5 MSOP-10 0.7 Efficiency (%) Efficiency (%) 0.7 0.6 0.5 0.4 0.3 V IN =3.6V 0.2 V OUT =1.8V 0.5 0.4 V OUT =3.3V L=10 μH 0.1 0.0 0.1 V IN =4.2V 0.2 0.1 1 0.1 1 Output Current (A) Output Current (A) Figure 14. Efficiency vs. Output Current Sep 2011 0.6 0.3 L=10 μ H 0.0 TSOT-23-5 MSOP-10 Figure 15. Efficiency vs. Output Current Rev. 1. 4 BCD Semiconductor Manufacturing Limited 8 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A 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 VIN EN 150k 300k R2 R1 FB SW AP3406A-ADJ 2.5V to 5.5V CIN 10μF VOUT L VIN 10μH COUT 10μF GND 1.8V 800mA Figure 17. Typical Application of AP3406A Sep 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 9 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Mechanical Dimensions 5° Sep 2011 Rev. 1. 4 Unit: mm(inch) GAUGE PLANE TSOT-23-5 BCD Semiconductor Manufacturing Limited 10 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Mechanical Dimensions (Continued) MSOP-10 Sep 2011 Rev. 1. 4 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 11 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Mechanical Dimensions (Continued) DFN-2×2-6(1) Sep 2011 Rev. 1. 4 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 12 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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