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| 1.25MHz, 600mA Synchronous Step-Down Regulator (Preliminary) Description The SE3806 is a high efficiency monolithic synchronous buck regulator using a constant frequency, voltage mode architecture. The device is available in fixed output voltage of 1.8V and 1.5V and adjustable output voltage. Supply current during operation is only 20A and drop to 1A in shutdown. The 2.5V to 5.5V input voltage range makes the SE3806 ideally suited for single Li-Ion battery-powered applications. life in portable systems. Switching frequency is internally set at 1.25MHz, 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. The SE3806 is available in low profile SOT package. 100% duty cycle provides low dropout operation, extending battery SE3806 Features High Efficiency: Up to 96% Very Low Quiescent Current: Only 20A During Operation 600mA Output Current 2.5V to 5V Input Voltage Range 1.25MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle Shutdown Mode draws 1A Supply Current Excellent Line and Load Transient Response Overtemperature Protection Available in SOT Package Application Cellular Phone Personal Information Appliances Wireless and DSL Modems Digital Still Cameras MP3 Players Portable Instruments Pin Configuration 5 Lead SOT-23 Application Diagram Revision 12/4/2008 Preliminary and all contents are subject to change without prior notice (c) Seaward Electronics, Inc., 2004. * www.seawardinc.com.cn * Page 1 1.25MHz, 600mA Synchronous Step-Down Regulator (Preliminary) OUTLINE DRAWING SOT-23-5L K B H D SE3806 DIMN A B C D E F H J K DIMENSIONS INCHES MM MIN MAX MIN MAX 0.110 0.059 0.036 0.014 0.0035 0.102 0.120 0.070 0.051 0.020 0.037 0.075 0.006 0.008 0.118 2.80 1.50 0.90 0.35 0.090 2.60 3.05 1.75 1.30 0.50 0.95 1.90 0.15 0.20 3.00 A F E C J Customer Support Seaward Electronics Incorporated - China Section B, 2nd Floor, ShangDi Scientific Office Complex, #22 XinXi Road Haidian District, Beijing 100085, China Tel: 86-10-8289-5700/01/05 Fax: 86-10-8289-5706 Seaward Electronics Corporation - Taiwan 2F, #181, Sec. 3, Minquan East Rd, Taipei, Taiwan R.O.C Tel: 886-2-2712-0307 Fax: 886-2-2712-0191 Seaward Electronics Incorporated - North America 1512 Centre Pointe Dr. Milpitas, CA95035, USA Tel: 1-408-821-6600 Last Updated - 12/4/2008 Revision 12/4/2008 Preliminary and all contents are subject to change without prior notice (c) Seaward Electronics, Inc., 2004. * www.seawardinc.com.cn * Page 2 |
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