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FAN5354 Arkusz danych(PDF) 1 Page - Fairchild Semiconductor |
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FAN5354 Arkusz danych(HTML) 1 Page - Fairchild Semiconductor |
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1 / 14 page  May 2010 © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5354 • Rev. 1.0.4 FAN5354 3MHz, 3A Synchronous Buck Regulator Features 3MHz Fixed-Frequency Operation Best-in-Class Load Transient 3A Output Current Capability 2.7V to 5.5V Input Voltage Range Adjustable Output Voltage: 0.8 to VIN•0.9 PFM Mode for High Efficiency in Light Load (Forced PWM Available on MODE Pin) Minimum PFM Frequency Avoids Audible Noise 270µA Typical Quiescent Current in PFM Mode External Frequency Synchronization Low Ripple Light-Load PFM Mode with Forced PWM Control Power Good Output Internal Soft-Start Input Under-Voltage Lockout (UVLO) Thermal Shutdown and Overload Protection 12-Lead 3x3.5mm MLP Applications Set-Top Box Hard Disk Drive Communications Cards DSP Power Description The FAN5354 is a step-down switching voltage regulator that delivers an adjustable output from an input voltage supply of 2.7V to 5.5V. Using a proprietary architecture with synchronous rectification, the FAN5354 is capable of delivering 3A at over 85% efficiency, while maintaining a very high efficiency of over 80% at load currents as low as 2mA. The regulator operates at a nominal fixed frequency of 3MHz, which reduces the value of the external components to 470nH for the output inductor and 10µF for the output capacitor. Additional output capacitance can be added to improve regulation during load transients without affecting stability and inductance up to 1.2µH may be used with additional output capacitance. At moderate and light loads, pulse frequency modulation (PFM) is used to operate the device in power-save mode with a typical quiescent current of 270µA. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed-frequency control, operating at 3MHz. In shutdown mode, the supply current drops below 1µA, reducing power consumption. PFM mode can be disabled if constant frequency is desired. To avoid audible noise, the regulator limits its minimum PFM frequency. The FAN5354 is available in 12-lead 3x3.5mm MLP package. Figure 1. Typical Application Ordering Information Part Number Temperature Range Package Packing Method FAN5354MPX -40 to 85°C MLP-12, 3x3.5mm Tape and Reel |
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