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FAN2012 Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN2012 Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 10 page FAN2011/FAN2012 Rev. 1.0.2 1 www.fairchildsemi.com November 2004 FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Features I 95% Efficiency, Synchronous Operation I Adjustable Output Voltage from 0.8V to VIN I 4.5V to 5.5V Input Voltage Range I Up to 1.5A Output Current I Fixed Frequency 1.3 MHz PWM Operation I 100% Duty Cycle Low Dropout Operation I Soft Start I Excellent Load Transient Response I 3x3mm 6-lead MLP Package Applications I Hard Disk Drive I Set Top Box I Point of Load Power I Notebook Computers I Communications Equipment Description The FAN2011/FAN2012 is a high-efficiency, low-noise synchro- nous PWM current mode DC-DC converter, designed for low voltage applications. It provides up to 1.5A continuous load cur- rent 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 shutdown 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, inex- pensive 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, mak- ing it possible to build a 1.5A complete DC/DC converter in a tiny space on the PCB. Typical Application Figure 1. Typical Application FAN2011 FAN2012 1 2 3 6 5 4 FB PGND SW PVIN VIN NC P1 (AGND) L1 R2 R1 +5V VOUT 4 x 10 µF 3.3 µH 10 µF 10K Ω 1 2 3 6 5 4 FB PGND SW PVIN VIN EN P1 (AGND) L1 R2 R1 +5V VOUT 4 x 10 µF 3.3 µH 10 µF 10K Ω |
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