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SS6639-27CZTR Datasheet(PDF) 1 Page - Silicon Standard Corp. |
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SS6639-27CZTR Datasheet(HTML) 1 Page - Silicon Standard Corp. |
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1 / 12 page  www.SiliconStandard.com 1 of 12 SS6639 1-Cell, 3-Pin, Step-Up DC/DC Controller n FEATURES • Guaranteed start-up from less than 0.9 V. • High efficiency. • Low quiescent current. • Fewer external components needed. • Low ripple and low noise. • Fixed output voltage: 2.7, 3.0V, 3.3V, and 5V. • Driver for external transistor. • Space-saving package: SOT-89 and TO-92. n APPLICATIONS • Pagers. • Cameras. • Wireless Microphones. • Pocket Organizers. • Battery Backup Suppliers. • Portable Instruments. n GENERAL DESCRIPTION The SS6639 is a high efficiency step-up DC/DC controller for applications using 1 to 4 battery cells. Only three external components are required to deliver a fixed output voltage of 2.7, 3.0V, 3.3V, or 5V. The SS6639 starts up from less than 0.9V input with a 1mA load. The Pulse Frequency Modulation scheme offers optimized performance for applications with light output loading and low input voltages. The output ripple and noise are lower than with circuits operating in PSM mode. The PFM control circuit operating up to 100 KHz switching rate results in smaller passive components. The space-saving SOT-89 and TO-92 packages make the SS6639 an ideal choice of DC/DC controller for space-conscious applications, such as pagers, electronic cameras, and wireless microphones. Using an external transistor driver pin (EXT), the SS6639 is recommended for applications requiring currents from several tens to several hundreds of milliamperes. n TYPICAL APPLICATION CIRCUIT SS6639-27 SS6639-30 SS6639-33 SS6639-50 GND *Q1: Sanyo 25D1803S-TC 60V/5A/20W + EXT D1 VOUT VOUT *Q1 2SD1803 C2 10nF R1 L1 33 µH VIN + C1 47 µF 300 GS SS14 C3 100 µF 100mA Load Current Step-Up Converter Rev.2.01 6/26/2003 |
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