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FAN2012I Arkusz danych(PDF) 1 Page - Fairchild Semiconductor |
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FAN2012I Arkusz danych(HTML) 1 Page - Fairchild Semiconductor |
1 / 10 page FAN2011/FAN2012 Rev. 1.0.4 1 www.fairchildsemi.com April 2006 ©2006 Fairchild Semiconductor Corporation FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Features ■ 95% Efficiency, Synchronous Operation ■ Adjustable Output Voltage from 0.8V to VIN ■ 4.5V to 5.5V Input Voltage Range ■ Up to 1.5A Output Current ■ Fixed Frequency 1.3 MHz PWM Operation ■ 100% Duty Cycle Low Dropout Operation (LDO) ■ Soft Start ■ Excellent Load Transient Response ■ 3x3mm 6-lead MLP Package Applications ■ Hard Disk Drive ■ Set Top Box ■ Point of Load Power ■ Notebook Computers ■ Communications Equipment Description The FAN2011/FAN2012 is a high-efficiency, low-noise synchronous Pulse Width Modulated (PWM) current mode DC-DC converter, designed for low voltage appli- cations. It provides up to 1.5A continuous load current from the 4.5V to 5.5V input. The output voltage is adjust- able over a wide range of 0.8V to VIN by means of an external voltage divider. The FAN2011 is always on, while the FAN2012 has an “Enable Input,” and the device can be put in the shut- down mode, in which the ground current falls below 1µA. A current mode control loop with a fast transient response ensures excellent line and load regulation. The fixed 1.3MHz switching frequency enables the user to choose a small, inexpensive external inductor and capacitor. Filtering is also easily accomplished with very small components. Protection features include input under-voltage lockout, short circuit protection and thermal shutdown. Soft-start limits in-rush current during start-up conditions. The device is available in a 3x3mm 6-lead MLP package, making it possible to build a 1.5A complete DC-DC con- verter in a tiny space on the PCB. Ordering Information Product Number Output Voltage Package Type Ambient Operating Temperature Order Code FAN2011 Adjustable 3x3mm 6-Lead MLP 0°C to 85°C FAN2011MPX FAN2012 Adjustable 3x3mm 6-Lead MLP 0°C to 85°C FAN2012MPX FAN2011I Adjustable 3x3mm 6-Lead MLP -40°C to 85°C FAN2011EMPX FAN2012I Adjustable 3x3mm 6-Lead MLP -40°C to 85°C FAN2012EMPX |
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