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FAN5307MPX Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor |
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FAN5307MPX Scheda tecnica(HTML) 1 Page - Fairchild Semiconductor |
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1 / 13 page  January 2006 ©2005 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com FAN5307 Rev. 1.0.4 FAN5307 High-Efficiency Step-Down DC-DC Converter Features ■ 95% Efficiency, Synchronous Operation ■ Adjustable Output Voltage Option from 0.7V to VIN ■ 2.5V to 5.5V Input Voltage Range ■ Customized Fixed Output Voltage Options ■ Up to 300mA Output Current ■ Fixed Frequency 1MHz PWM Operation ■ High Efficiency Power Save Mode ■ 100% Duty Cycle Low Dropout Operation ■ Soft Start ■ Dynamic Output Voltage Positioning ■ 15 µA Quiescent Current ■ Excellent Load Transient Response ■ 5-Lead SOT-23 Package ■ 6-Lead MLP 3x3mm Package Applications ■ Pocket PCs, PDAs ■ Cell Phones ■ Battery-Powered Portable Devices ■ Digital Cameras ■ Low Power DSP Supplies General Description The FAN5307, a high efficiency low noise synchronous PWM current mode and Pulse Skip (Power Save) mode DC-DC converter is designed for battery-powered appli- cations. It provides up to 300mA of output current over a wide input range from 2.5V to 5.5V. The output voltage can be either internally fixed or externally adjustable over a wide range of 0.7V to 5.5V VIN by an external voltage divider. Custom output voltages are also available. Con- tact a Fairchild sales representative for customized out- put voltage options. At moderate and light loads pulse skipping modulation is used. Dynamic voltage positioning is applied, and the output voltage is shifted 0.8% above nominal value for increased headroom during load transients. At higher loads the system automatically switches to current mode PWM control, operating at 1 MHz. A current mode con- trol loop with fast transient response ensures excellent line and load regulation. In Power Save mode, the quies- cent current is reduced to 15 µA in order to achieve high efficiency and to ensure long battery life. In shut-down mode, the supply current drops below 1 µA. The device is available in 5-lead SOT-23 and 6-lead MLP 3x3mm packages. Typical Application EFFICIENCY vs. LOAD CURRENT VOUT = 1.8V Load Current [mA] 0.01 0.1 1 10 100 1000 65 70 75 80 85 90 95 100 VIN=2.5V VIN=3.6V VIN=5.5V |
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