FAN5353 Datasheet, PDF (1/13 Pages) Fairchild Semiconductor – 3MHz, 3A Synchronous Buck Regulator

September 2010
FAN5353
3MHz, 3A Synchronous Buck Regulator
Features
ƒ 3MHz Fixed-Frequency Operation
ƒ Best-in-Class Load Transient
ƒ 3A Output Current Capability
ƒ 2.7V to 5.5V Input Voltage Range
ƒ Adjustable Output Voltage: 0.8V to VIN•0.9
ƒ Power Good Output
ƒ Internal Soft-Start
ƒ Input Under-Voltage Lockout (UVLO)
ƒ Thermal Shutdown and Overload Protection
ƒ 12-lead 3x3.5mm MLP
Applications
ƒ Set-Top Box
ƒ Hard Disk Drive
ƒ Communications Cards
ƒ DSP Power
Description
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. 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.
R2 _AGND
R1
C_OUT
FB ₁
VOUT ₂
PGND ₃
PGND ₄
SW ₅
SW ₆
P1
(GND)
12
11 ^PGOOD
10 ^EN
9 ^VCC
8 ^PVIN
7 ^PVIN
C_IN1
C_VCC
C_IN
Figure 1. Typical Application
Ordering Information
Part Number
FAN5353MPX
Temp. Range
-40 to 85°C
Package
MLP-12, 3x3.5mm
Packing Method
Tape and Reel
© 2009 Fairchild Semiconductor Corporation
FAN5353 • Rev. 1.0.2
www.fairchildsemi.com