3Mhz, 3A Synchronous Buck Regulator

The FAN5353 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 FAN5353 is capable of delivering 3A at over 85% efficiency, while maintaining a very high efficiency of up to 90%. 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 without affecting stability if tighter regulation during transients is required. The regulator includes an open-drain power good (PGOOD) signal that pulls low when the output is not in regulation. In shutdown mode, the supply current drops below 1µA, reducing power consumption. FAN5353 is available in a 12-lead 3x3.5mm MLP package.


  • 3MHz Fixed-Frequency Operation
  • Best-in-Class Load Transient
  • 3A Output Current Capability
  • 2.7V to 5.5V Input Voltage Range
  • Adjustable Output Voltage: 0.8V to VINx0.9
  • Power Good Output
  • Internal Soft-Start
  • Input Under-Voltage Lockout (UVLO)
  • Thermal Shutdown and Overload Protection
  • 12-lead 3x3.5mm MLP
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Product Product &
Eco Status
Unit Price/
1K Order
Packing Method Convention Package Marking
FAN5353MPX Full Production
Green as of Nov 2009

MLP 3x3.5 12L  -  Details
0.8 x 3.5 x 3mm,  TAPE REEL

PDF MLP 3x3.5 12L  Drawing
Last Update: Jan 2015 PDF MLP12L 3.0x3.5, Packing Drawing
Last Update: Oct 2015
Line 1$Y (Fairchild logo)
&Z (Plant Code)
&2 (2-Digit Date Code)

Line 25353

FIT 2.6 @55°C
change temp

ESD (CDM) 2000V

ESD (HBM) 2000V


Moisture Sensitivity Level (MSL) 1

Max Reflow Temp 260


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