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. AP3406A 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 and MSOP-10 packages. • • • • TSOT-23-5 GPS WiFi Card Portable Media Player Digital Still and Video Cameras MSOP-10 Figure 1. Package Types of AP3406A May 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Pin Configuration EN 1 GND 2 KT Package MM Package TSOT-23-5 MSOP-10 5 3 SW 4 PGND VIN 1 10 NC 2 9 SW GND 3 8 EN NC 4 7 NC FB 5 6 NC FB VIN Figure 2. Pin Configuration of AP3406A (Top View) Pin Description Pin Number TSOT-23-5 MSOP-10 Pin Name 1 8 EN 2 3 GND 3 9 SW 4 1 VIN 5 5 FB 2, 4, 6, 7 NC 10 PGND May 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 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 Rev. 1. 2 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 TR: Tape & Reel Package KT: TSOT-23-5 MM: MSOP-10 Package TSOT-23-5 MSOP-10 Temperature Range -40 to 85°C ADJ: Adjustable Voltage Part Number Marking ID Packing Type AP3406AKT-ADJTRG1 L2A Tape & Reel AP3406AMM-ADJTRG1 3406AMM-G1 Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. May 2009 Rev. 1. 2 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 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 MSOP-10 135 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) 800 TA -40 Maximum Output Current Operating Ambient Temperature May 2009 Rev. 1. 2 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 May 2009 Rev. 1. 2 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 May 2009 VIN=3.6V 0.4 Figure 7. Output Voltage vs. Output Current Rev. 1. 2 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) May 2009 Figure 11. Start up from Shutdown (VIN=3.6V, VOUT=1.8V, RLOAD=2.5Ω) Rev. 1. 2 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 May 2009 0.6 0.3 L=10 µ H 0.0 TSOT-23-5 MSOP-10 Figure 15. Efficiency vs. Output Current Rev. 1. 2 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 EN VIN 150k 300k R2 R1 FB VIN 2.5V to 5.5V CIN 10µF SW AP3406A-ADJ VOUT L 10µH COUT 10µF GND 1.8V 800mA Figure 17. Typical Application of AP3406A May 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 9 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Mechanical Dimensions TSOT-23-5 May 2009 Rev. 1. 2 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 10 Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Mechanical Dimensions (Continued) MSOP-10 May 2009 Rev. 1. 2 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 11 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. 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