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FAN5308 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN5308 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 11 page FAN5308 Rev. 1.0.1 1 www.fairchildsemi.com April 2005 ©2005 Fairchild Semiconductor Corporation FAN5308 800mA High-Efficiency Step-Down DC-DC Converter Features ■ 96% Efficiency, Synchronous Operation ■ Adjustable Output Voltage Options from 0.8V to VIN ■ 2.5V to 5.5V Input Voltage Range ■ Up to 800mA Output Current ■ Fixed Frequency 1.3MHz PWM Operation ■ High Efficiency Power Save Mode ■ 100% Duty Cycle Low Dropout Operation ■ Soft Start ■ Output Over-Voltage Protection ■ Dynamic Output Voltage Positioning ■ 25µA Quiescent Current ■ Thermal Shutdown and Short Circuit Protection ■ Pb-Free 3x3mm 6-Lead MLP Package Applications ■ Pocket PCs, PDAs ■ Cell Phones ■ Battery-Powered Portable Devices ■ Digital Cameras ■ Hard Disk Drives ■ Set-Top-Boxes ■ Point-of-Load Power ■ Notebook Computers ■ Communications Equipment Description Designed for use in battery-powered applications, the FAN5308 is a high-efficiency, low-noise synchronous PWM current mode and Pulse Skip (Power Save) mode DC-DC converter. It can provide up to 800mA of output current over a wide input range from 2.5V to 5.5V. The output voltage can be externally adjusted over a wide range of 0.8V to 5.5V by means of an external volt- age divider. 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 dur- ing load transients. At higher loads the system automatically switches over to current mode PWM control, operating at 1.3 MHz. A current mode control loop with fast transient response ensures excellent line and load regulation. To achieve high effi- ciency and ensure long battery life, the quiescent current is reduced to 25µA in Power Save mode, and the supply current drops below 1µA in shut-down mode. The FAN5308 is available in a 3x3mm 6-lead MLP package. Typical Application Figure 1. Typical Application 2 x 10 µF 10 µF V OUT EN SW C IN C OUT 1.2V (800mA) 1 2 3 6 5 4 FB PGND VIN NC P1 (AGND) 3.3 µH R1 10K Ω 5K Ω R2 |
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