SP1638 3Pin , DC-DC Step-Up Converter DESCRIPTION The SP1638 is a high efficiency step-up DC/DC converter for applications using 1 to 4 NiMH battery cells. Only three external components are required to deliver a fixed output voltage of 2.7V, 3.0V, 3.3V, 4.5V or 5V. The SP1638 starts up from less than 0.9V input with 1mA load. Pulse Frequency Modulation scheme brings optimized performance for applications with light output loading and low input voltages. The output ripple and noise are lower compared with the circuits operating in PSM mode. The PFM control circuit operating in 100KHz (max.) switching rate results in smaller passive components. The space saving SOT-89 packages make the SP1638 an ideal choice of DC/DC converter for space conscious applications, like pagers, electronic cameras, and wireless microphones. FEATURES A Guaranteed Start-Up From less than 0.9V High Efficiency Low Quiescent current Less Number of External Components needed. Low Ripple and Low Noise Fixed Output Voltage : 2.7V , 3.0V , 3.3V , 4.5V , 5.0V Space Saving Package : SOT-89 2004/04/30 Preliminary APPLICATIONS z Pagers. z Cameras. z Wireless Microphones. z Pocket Organizers. z Battery Backup Suppliers. z Portable Instruments. PIN CONFIGURATION(SOT-89) PART MARKING Page 1 SP1638 3Pin , DC-DC Step-Up Converter TYPICAL APPLCATION CIRCUIT PIN DESCRIPTION Pin Symbol Description 1 GND Ground. Must be low impedance ; solder directly to ground plane 2 VOUT IC Supply Pin. Connect VOUT to converter output 3 SW Internal drain of N-MOSFET switch ORDERING INFORMATION ※ ※ ※ ※ ※ Part Number Vout SP1638AS89RG 2.7V SP1638BS89RG 3.0V SP1638CS89RG 3.3V SP1638DS89RG 4.5V SP1638ES89RG 5.0V SP1638AS89RG : Tape Reel ; Pb - Free SP1638BS89RG : Tape Reel ; Pb - Free SP1638CS89RG : Tape Reel ; Pb - Free SP1638DS89RG : Tape Reel ; Pb - Free SP1638ES89RG : Tape Reel ; Pb - Free 2004/04/30 Preliminary Package SOT-89 SOT-89 SOT-89 SOT-89 SOT-89 Part Marking 1638A 1638B 1638C 1638D 1638E Page 2 SP1638 3Pin , DC-DC Step-Up Converter BLOCK DIAGRAM ABSOULTE MAXIMUM RATINGS (TA=25℃ Unless otherwise specified) Parameter Supply Voltage (VOUT Pin) SW Voltage Operating Temperature Storage Temperature Lead Temperature(Soldering 10sec) Symbol VS VSW TOPR TS TL Value 6 6 -40～85 -65～150 Unit V V ℃ ℃ 260 ℃ The IC has a protection circuit against static electricity. Do not apply high static electricity or high voltage that exceeds the performance of the protection circuit to the IC. 2004/04/30 Preliminary Page 3 SP1638 3Pin , DC-DC Step-Up Converter ELECTRICAL CHARACTERISTICS (TA=25℃, Iout = 10mA , Unless otherwise specified) Parameter Output Voltage Input Voltage Start-Up Voltage Min. Hold-on Voltage No-Load Input Current Supply Current Supply Current SW Leakage Current SW Switch-On Resistance Oscillator Duty Cycle Max. Oscillator Freq. Efficiency 2004/04/30 Preliminary Conditions VIN=1.8V SP1638A VIN=1.8V SP1638B VIN=2.0V SP1638C VIN=3.0V SP1638D VIN=3.0V SP1638E Normal Operation Iout =1mA, VIN:02V Iout =1mA, VIN:20V Iout =0mA SP1638A SP1638B VS = SP1638C VOUT x 0.95 SP1638D SP1638E SP1638A SP1638B VS = SP1638C VOUT + 0.5V SP1638D SP1638E VSW =6V, VS =V OUT + 0.5V SP1638A SP1638B VS =VOUT x 0.95, SP1638C VSW =0.4V SP1638D SP1638E VS=VOUT x 0.95 VS=VOUT x 0.95 Min. 2.633 2.925 3.218 4.387 4.875 Typ. 2.7 3.0 3.3 4.5 5.0 0.8 Max. 2.767 3.075 3.382 4.613 5.125 6 0.9 0.7 15 42 50 60 70 90 7 7 7 7 7 65 80 V V V V uA uA uA 0.5 1.3 1.2 1.1 1.0 1.0 75 105 85 Unit uA Ω 85 130 % KHz % Page 4 SP1638 3Pin , DC-DC Step-Up Converter SOT-89 PACKAGE OUTLINE 2004/04/30 Preliminary Page 5 SP1638 3Pin , DC-DC Step-Up 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 ©2004 SYNC Power Corporation – Printed in Taiwan – All Rights Reserved SYNC Power Corporation 9F-5, No.3-2, 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 2004/04/30 Preliminary Page 6