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This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN5354 3 MHz, 3 A Synchronous Buck Regulator December 2012 FAN5354 3 MHz, 3 A Synchronous Buck Regulator Description Features The FAN5354 is a step-down switching voltage regulator that 3 MHz Fixed-Frequency Operation delivers an adjustable output from an input voltage supply of 2.7 V to 5.5 V. Using a proprietary architecture with Best-in-Class Load Transient synchronous rectification, the FAN5354 is capable of 3 A Output Current Capability delivering 3 A at over 85% efficiency, while maintaining a very high efficiency of over 80% at load currents as low as 2.7 V to 5.5 V Input Voltage Range 2 mA. The regulator operates at a nominal fixed frequency of Adjustable Output Voltage: 0.8 to 2.0 V 3 MHz, which reduces the value of the external components to 470 nH for the output inductor and 10 F for the output PFM Mode for High Efficiency in Light Load (Forced PWM capacitor. Additional output capacitance can be added to Available on MODE Pin) improve regulation during load transients without affecting Minimum PFM Frequency Avoids Audible Noise stability and inductance up to 1.2 H may be used with additional output capacitance. 270 A Typical Quiescent Current in PFM Mode At moderate and light loads, pulse frequency modulation External Frequency Synchronization (PFM) is used to operate the device in power-save mode Low Ripple Light-Load PFM Mode with Forced with a typical quiescent current of 270 A. Even with such a PWM Control low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the Power Good Output system automatically switches to fixed-frequency control, Internal Soft-Start operating at 3 MHz. In shutdown mode, the supply current drops below 1 A, reducing power consumption. PFM mode Input Under-Voltage Lockout (UVLO) can be disabled if constant frequency is desired. To avoid Thermal Shutdown and Overload Protection audible noise, the regulator limits its minimum PFM frequency. The FAN5354 is available in 12-lead 3x3.5 mm 12-Lead 3x3.5 mm MLP MLP package. Applications Set-Top Box Hard Disk Drive Communications Cards DSP Power Figure 1. Typical Application Ordering Information Part Number Temperature Range Package Packing Method FAN5354MPX -40 to 85C MLP-12, 3 x 3.5 mm Tape and Reel 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5354 Rev. 1.0.7