FAN2011

FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator November 2004 FAN2011/FAN2012 1.5A Low Voltage Current Mode Synchronous PWM Buck Regulator Features I I I I I I I I I 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 Soft Start Excellent Load Transient Response 3x3mm 6-lead MLP Package Description The FAN2011/FAN2012 is a high-efficiency, low-noise synchronous PWM current mode DC-DC converter, designed for low voltage applications. It provides up to 1.5A continuous load current from the 4.5V to 5.5V input. The output voltage is adjustable 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, 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 ...