SP3406 600mA Buck Converter DESCRIPTION APPLICATIONS SP3406 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages, such as 1.5V,1.8V,etc. Supply current with no load is 30uA and drops to <1uA in shutdown. The 2.5 to 6.5V input voltage range makes the SP3406 ideally suitable for single Li-Ion, two to four AA battery-powered applications. In low dropout operation mode, the duty cycle can reach to 100%, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The SP 3406 is available in a small SOT-23-5 package. Digital Camera PDA Hand Held Communication Equipment Wireless and DSL Modems Portable instrument Microprocessor and DSP Core Supplies MID or UPMC FEATURES PIN CONFIGURATION ( SOT-23-5L) High Efficiency: Up to 96%; 1.5MHz Constant Switching Frequency; 600mA Output Current at Vin=3V; Integrated Main Switch and Synchronous Rectifier, No Schottky Diode Required; 2.5 to 6.5V input voltage; Output Voltage as Low as 0.6V; 100% Duty Cycle in Dropout; Quiescent Current: 30uA(input<4.2V); Slope Compensated Current Mode Control for Excellent Line and Load Transient Response; Short Circuit Protection and Thermal Fault Protection; <1uA Shutdown Current; Soft Start; 2012/11/15 V. 1 PART MARKING Page 1 SP3406 600mA Buck Converter TYPICAL APPLICATION CIRCUIT Vout = 0.6 × (1+ R2 ) R1 PIN DESCRIPTION & ELECTRICAL CHARACTERISTICS Pin Symbol Description Min. Operating Rating Typ. Max. Unit 1 2 3 RUN GND SW Control Input Ground Switch Node Connect to Inductor -0.3 -0.3 -0.3 VIN VIN+0.3 VIN+0.3 V V V 4 5 VIN VFB Supply Voltage Feedback -0.3 -0.3 6.5 VIN V V BLOCK DIAGRAM ORDERING INFORMATION Part Number Package SP3406S25RGB SOT-23-5L ※ SP3406S25RGB : 7” Tape Reel; Pb – Free, Halogen-Free 2012/11/15 V. 1 Part Marking 3406 Page 2 SP3406 600mA Buck Converter ABSOULTE MAXIMUM RATINGS (TA=25℃, unless otherwise specified.) The following ratings designate persistent limits beyond which damage to the device may occur. Symbol VIN IOUT TJ TSTG TLEAD Tope RӨJC Parameter Value -0.3 ~ 6.5 1.3 125 -65 to 150 260 -40 ~ 85 250 DC Supply Voltage SW Current, Source or Sink Operating Junction Temperature Range Storage Temperature Range Lead Soldering Temperature for 5 sec. Operation Temperature Range Thermal Resistance Junction – Case (*) Unit V A ℃ ℃ ℃ ℃ ℃/W ELECTRICAL CHARACTERISTICS (Unless otherwise stated, these specifications apply TA=25°C; V IN=3.6V) Symbol SUPPLY VIN IIN Parameter Supply Voltage Input DC Bias Current Active mode Input DC Bias Current Sleep Mode Input DC Bias Current Shutdown Mode RUN Threshold RUN Leakage Current VRUN IRUN FEEDBACK VFB Regulated Feedback Voltage Reference Voltage Line ΔVFB Regulation IFB Feedback Current Output Voltage Load VLOADREG Regulation IPEAK Peak Induct Current SWITCHING REGULATOR RPMOS * RDS(on) for P MOSFET RNMOS * RDS(on) for N MOSFET ILSW SW Leakage Current fOSC Oscillator Frequency Conditions Min. Typ. Max. Unit 6.5 V 300 400 uA 20 35 uA 0.1 1 uA 0.3 1 0.01 1.5 1 V uA 0.588 0.6 0.612 V 0.04 0.4 %/V 30 nA 2.5 VFB = 0.5V or VOUT = 90%, ILOAD = 0A VFB = 0.62V or VOUT = 103%, ILOAD = 0A VRUN <0V, VIN = 4.2V VIN = 2.5V to 5.5V 0.5 VIN = 3V, VFB = 0.5V, Duty Cycle < 35% ISW = 100mA ISW = 100mA VRUN = 0V, VIN = 5V, VSW = 0V or 5V VFB = 0V or VOUT = 0V VFB=0.6V or VOUT=100% 0.75 1.2 % 1 1.25 A 400 350 500 450 mΩ mΩ 0.01 1 uA 1.5 1.8 MHz * Guaranteed by Design 2012/11/15 V. 1 Page 3 SP3406 600mA Buck Converter TYPICAL PERFORMANCE CHARACTERISTICS TA= +25℃; unless otherwise noted. Output Voltage vs. Load Current Oscillator Frequency vs. Supply Voltage Efficiency vs. Output Current Output Voltage vs. Input Voltage Normal Operating Waveforms VIN=4.2V,VOUT=2.5V,IOUT=0.6A Short Circuit Protection Waveforms VIN=4.2V,VOUT=2.5V,IOUT=0.6A CH1： ：VSW 2012/11/15 V. 1 , CH2： ： IL , CH3： ：Vout Page 4 SP3406 600mA Buck Converter SOT 23-5L PACKAGE OUTLINE 2012/11/15 V. 1 Page 5 SP3406 600mA Buck Converter Information provided is alleged to be exact and consistent. SYNC Power Corporation presumes no responsibility for the penalties of use of such information or for any violation of patents or other rights of third parties, which may result from its use. No license is granted by allegation or otherwise under any patent or patent rights of SYNC Power Corporation. Conditions mentioned in this publication are subject to change without notice. This publication surpasses and replaces all information previously supplied. SYNC Power Corporation products are not authorized for use as critical components in life support devices or systems without express written approval of SYNC Power Corporation. ©The SYNC Power logo is a registered trademark of SYNC Power Corporation ©2012 SYNC Power Corporation – Printed in Taiwan – All Rights Reserved SYNC Power Corporation 7F-2, No.3-1, Park Street NanKang District (NKSP), Taipei, Taiwan, 115, R.O.C Phone: 886-2-2655-8178 Fax: 886-2-2655-8468 http://www.syncpower.com 2012/11/15 V. 1 Page 6