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| Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A General Description 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. This IC is available in TSOT-23-5 and MSOP-10 packages. Features * * * * * * * * * * 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: <1A Applications * * * * GPS WiFi Card Portable Media Player Digital Still and Video Cameras TSOT-23-5 MSOP-10 Figure 1. Package Types of AP3406A May 2009 Rev. 1. 2 1 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Pin Configuration KT Package TSOT-23-5 MM Package MSOP-10 VIN EN GND SW 1 2 3 4 5 1 2 3 4 5 10 9 8 7 6 PGND SW EN NC NC FB NC GND NC VIN FB Figure 2. Pin Configuration of AP3406A (Top View) Pin Description Pin Number TSOT-23-5 1 2 3 4 5 MSOP-10 8 3 9 1 5 2, 4, 6, 7 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 1A 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 10F 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 EN GND SW VIN FB NC PGND May 2009 Rev. 1. 2 2 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Functional Block Diagram Figure 3. Functional Block Diagram of AP3406A Ordering Information AP3406A Circuit Type TR: Tape & Reel Package KT: TSOT-23-5 MM: MSOP-10 Package TSOT-23-5 MSOP-10 G1: Green ADJ: Adjustable Voltage Temperature Range -40 to 85C Part Number AP3406AKT-ADJTRG1 AP3406AMM-ADJTRG1 Marking ID L2A 3406AMM-G1 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. May 2009 Rev. 1. 2 3 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Absolute Maximum Ratings (Note 1) Parameter Input Voltage Feedback Voltage EN Pin Voltage SW Pin Voltage Thermal Resistance Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10sec) Symbol VIN VFB VEN VSW JA TJ TSTG TLEAD Value -0.3 to 6 -0.3 to VIN +0.3 -0.3 to VIN+0.3 -0.3 to VIN+0.3 TSOT-23-5 MSOP-10 125 -65 to 150 260 250 135 Unit V V V V C/W C C C 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 Input Voltage Maximum Output Current Operating Ambient Temperature Symbol VIN IOUT (MAX) TA Min 2.5 800 -40 Max 5.5 Unit V mA 85 C May 2009 Rev. 1. 2 4 BCD Semiconductor Manufacturing Limited 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 85C. Parameters Supply Current Shutdown Supply Current Under Voltage Threshold Under Voltage Hysteresis Lockout Lockout Symbol ICC ISHDN VUVLO VHUVLO IFB VFB Conditions VFB=0.55V VEN=0V, VIN=5.5V Rising edge Min Typ 400 0.01 2.27 200 Max 600 1 Unit A A V mV Feedback Bias Current Feedback Voltage VFB=0.65V IOUT=100mA VIN=2.5V, VOUT=0.9V VIN=3.6V, VOUT=1.2V VIN=4.6V, VOUT=3.3V VFB=0.55V -50 0.588/ 0.582 800 800 800 0.95 0.8 1.5 0.5 0.600 50 0.612/ 0.618 nA V Maximum Output Current IOUT (MAX) mA Switch Current Limit Oscillator Frequency EN Pin Threshold EN Pin Input Leakage Current Internal PFET Resistance Internal NFET Resistance Maximum Duty Cycle Soft-start Time Thermal Shutdown Threshold Thermal Shutdown Hysteresis On On ILIM fOSC VENL VENH IH IL RDSONP RDSONN DMAX TSS TOTSD THYS 1.25 1.1 1.4 0.6 A MHz V A A % s C C VEN=3.6V VEN=0V ISW=100mA ISW=-100mA VFB=0.55V VEN=0V to VIN IOUT50mA -0.1 -0.1 0.44 0.29 100 220 160 30 0.1 0.1 May 2009 Rev. 1. 2 5 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Typical Performance Characteristics L=10H, CIN=COUT=10F, TA=25oC, unless otherwise noted. 0.7 1.4 1.3 0.6 1.2 Supply Current (mA) Frequency (MHz) 0.5 1.1 0.4 1.0 VIN=3.6V 0.9 VOUT=1.8V IOUT=0A 0.3 VIN=3.6V VFB=0.55V 0.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0.2 -60 -40 -20 0 20 40 60 o 80 100 120 140 160 Input Voltage (V) Temperature ( C) Figure 4. Frequency vs. Input Voltage Figure 5. Supply Current vs. Temperature 2.0 1.8 1.6 2.0 1.8 1.6 Current Limit (A) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -60 Output Voltage (V) 1.4 1.2 1.0 0.8 0.6 VIN=3.6V VFB=0.55V -40 -20 0 20 O 0.4 0.2 0.0 0.0 VIN=3.6V VOUT=1.8V 40 60 80 100 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Temperature ( C) Output Current (A) Figure 6. Current Limit vs. Temperature Figure 7. Output Voltage vs. Output Current May 2009 Rev. 1. 2 6 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Typical Performance Characteristics (Continued) 400ns/div VSW 2V/div VOUT 20mV/div VSW 2V/div VOUT 20mV/div 400ns/div 400ns/div Figure 8. Light Load Operation (VIN=3.6V, VOUT=1.8V, IOUT=0mA) Figure 9. Heavy Load Operation (VIN=3.6V, VOUT=1.8V, IOUT=800mA) IOUT 500mA/div VOUT 100mV/div IIN 500mA/div VOUT 2V/div VEN 2V/div 200s/div 400s/div Figure 10. Load Transient (VIN=3.6V, VOUT=1.8V, IOUT=0mA to 800mA) Figure 11. Start up from Shutdown (VIN=3.6V, VOUT=1.8V, RLOAD=2.5) May 2009 Rev. 1. 2 7 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Typical Performance Characteristics (Continued) VOUT 1V/div VSW 2V/div IL 1A/div VOUT 1V/div VSW 2V/div IL 1A/div 10s/div 40s/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 0.9 0.8 0.7 1.0 0.9 0.8 Efficiency (%) Efficiency (%) TSOT-23-5 MSOP-10 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 TSOT-23-5 MSOP-10 0.6 0.5 0.4 0.3 0.2 0.1 0.0 V IN =3.6V V OUT =1.8V L=10H V IN =4.2V V OUT =3.3V L=10H 0.1 1 0.1 1 Output Current (A) Output Current (A) Figure 14. Efficiency vs. Output Current Figure 15. Efficiency vs. Output Current May 2009 Rev. 1. 2 8 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Typical Performance Characteristics (Continued) 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 -60 Normalized Feedback Voltage (%) VIN=3.6V VOUT=1.8V -40 -20 0 20 o 40 60 80 100 Temperature ( C) Figure 16. Normalized Feedback Voltage vs. Temperature Typical Application 150k R2 VIN 2.5V to 5.5V CIN 10F EN VIN FB SW 300k R1 L 10H COUT 10F VOUT 1.8V 800mA AP3406A-ADJ GND Figure 17. Typical Application of AP3406A May 2009 Rev. 1. 2 9 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Mechanical Dimensions TSOT-23-5 Unit: mm(inch) May 2009 Rev. 1. 2 10 BCD Semiconductor Manufacturing Limited Data Sheet 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A Mechanical Dimensions (Continued) MSOP-10 Unit: mm(inch) May 2009 Rev. 1. 2 11 BCD Semiconductor Manufacturing Limited 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. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others. MAIN SITE - Headquarters BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited - Wafer Fab No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China Shanghai SIM-BCD Semiconductor Manufacturing Limited Tel: +86-21-24162266, Fax: +86-21-24162277 800, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6485 1491, Fax: +86-21-5450 0008 REGIONAL SALES OFFICE Shenzhen Office REGIONAL SALES OFFICE - Wafer Fab BCD Semiconductor Manufacturing Limited Shanghai Design Group - IC SIM-BCD Semiconductor Manufacturing Co., Ltd. 800 Yi Shan Road, Shanghai 200233, China Corporation Advanced Analog Circuits (Shanghai) Tel: +86-21-6485 900, Yi Shan Road, Shanghai 200233, China 8F, Zone B, 1491, Fax: +86-21-5450 0008 Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 USA Office BCD Semiconductor Corp. USA Office 30920 Huntwood Ave. Hayward, BCD Semiconductor Corporation CA 94544, USA 30920 Huntwood Ave. Hayward, Tel 94544, U.S.A CA : +1-510-324-2988 Fax: +1-510-324-2788 Tel : +1-510-324-2988 Fax: +1-510-324-2788 Taiwan Office Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office BCD Taiwan Office (Taiwan) Company Limited Semiconductor Shenzhen Office Room E, SIM-BCD Semiconductor 3rd Fuzhong Road, Futian District, Shenzhen, 4F, 298-1, Rui Guang Road,(Taiwan) Company Limited Shanghai 5F, Noble Center, No.1006,Manufacturing Co., Ltd. Shenzhen Office BCD Semiconductor Nei-Hu District, Taipei, 518026, China Taiwan 298-1, Rui Guang Road, Nei-Hu District, Taipei, Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office 4F, Tel: +86-755-8826 Center, Tel: Taiwan Room E, 5F, Noble 7951 No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China +886-2-2656 2808 Fax:+86-755-8826 7951 +86-755-8826 7865 Fax: +886-2-2656 28062808 Tel: Tel: +886-2-2656 Fax: +86-755-8826 7865 Fax: +886-2-2656 2806 |
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