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This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN5353 3 MHz, 3 A Synchronous Buck Regulator December 2013 FAN5353 3 MHz, 3 A Synchronous Buck Regulator Description Features The FAN5353 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 FAN5353 is capable of 3 A Output Current Capability delivering 3 A at over 85% efficiency. The regulator operates at a nominal fixed frequency of 3 MHz, which reduces the 2.7 V to 5.5 V Input Voltage Range value of the external components to 470 nH for the output Adjustable Output Voltage: 0.8 V to 90% of V IN inductor and 10 F for the output capacitor. Additional output Power Good Output capacitance can be added without affecting stability if tighter regulation during transients is required. The regulator Internal Soft-Start includes an open-drain power good (PGOOD) signal that pulls low when the output is not in regulation. Input Under-Voltage Lockout (UVLO) Thermal Shutdown and Overload Protection In shutdown mode, the supply current drops below 1 A, reducing power consumption. 12-Lead, 3 x 3.5 mm MLP FAN5353 is available in a 12-lead 3x3.5 mm MLP package. Applications R2 AGND Set-Top Box R1 FB 1 12 Hard Disk Drive VOUT PGOOD 2 11 C OUT Communications Cards PGND EN C VCC 3 10 P1 DSP Power PGND VCC (GND) 4 9 SW PVIN 5 8 SW PVIN 6 7 C C IN1 IN Figure 1. Typical Application Ordering Information Part Number Temp. Range Package Packing Method FAN5353MPX -40 to 85C MLP-12, 3 x 3.5 mm Tape and Reel 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5353 Rev. 1.0.3 L1 R3