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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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KB3408 Scheda tecnica(PDF) 1 Page - Kingbor Technology Co |
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KB3408 Scheda tecnica(HTML) 1 Page - Kingbor Technology Co |
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1 / 6 page  March 2007 1 KB3408 KB3408 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 1.5MHz, Synchronous Step-Down Regulator in SOT23-5 350mA ■ High Efficiency: Up to 96% ■ Very Low Quiescent Current: Only 20 µA During Operation ■ 350mA Output Current ■ 2.5V to 7.4V Input Voltage Range ■ 1.5MHz Constant Frequency Operation ■ No Schottky Diode Required ■ Low Dropout Operation: 100% Duty Cycle ■ 0.6V Reference Allows Low Output Voltages ■ Shutdown Mode Draws 1 µA Supply Current ■ Current Mode Operation for Excellent Line and Load Transient Response ■ Overtemperature Protected ■ Low Profile (1mm) SOT23-5 Package The KB3408 is a high efficiency monolithic synchro- nous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.8V and 3.3V. Supply current during operation is only 20 µA and drops to 1µA in shutdown. The 2.5V to 7.4V input voltage range makes the KB3408 ideally suited for single Li-Ion battery-pow- ered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic Burst Mode operation increases efficiency at light loads, further extending battery life. 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 feed- back reference voltage. The KB3408 is available in a low profile (1mm) SOT23-5 package. ■ Cellular Telephones ■ Personal Information Appliances ■ Wireless and DSL Modems ■ Digital Still Cameras ■ MP3 Players ■ Portable Instruments Figure 1a. High Efficiency Step-Down Converter Figure 1b. Efficiency vs Load Current VIN CIN 4.7 µF Tan VIN 2.7V TO 7.4V KB3408-1.8 RUN 3 4.7 µH 5 4 1 2 SW VOUT GND COUT 10 µF CER VOUT 1.8V 350mA OUTPUT CURRENT (mA) 70 80 90 95 0.1 10 100 500 60 1 85 75 65 VIN = 2.7V VOUT = 1.8V VIN = 4.2V VIN = 3.6V APPLICATIONS FEATURES DESCRIPTION TYPICAL APPLICATION + |
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