Buck Converter. FAN5350 Datasheet

FAN5350 Converter. Datasheet pdf. Equivalent

Part FAN5350
Description 3MHz 600mA DC/DC Buck Converter
Feature www.DataSheet4U.com FAN5350 — 3MHz, 600mA Step-Down DC-DC Converter in Chip-Scale Packaging June 2.
Manufacture Fairchild Semiconductor
Datasheet
Download FAN5350 Datasheet




FAN5350
www.DataSheet4U.com
June 2007
FAN5350
3MHz, 600mA Step-Down DC-DC Converter in
Chip-Scale Packaging
Features
ƒ 3MHz Fixed-Frequency Operation
ƒ 16µA Typical Quiescent Current
ƒ 600mA Output Current Capability
ƒ 2.7V to 5.5V Input Voltage Range
ƒ 1.82V Fixed Output Voltage
ƒ Synchronous Operation
ƒ Power-Save Mode
ƒ Soft-Start Capability
ƒ Input Under-Voltage Lockout (UVLO)
ƒ Thermal Shutdown and Overload Protection
ƒ 6-Lead 3 x 3mm MLP
ƒ 5-Bump 1 x 1.37mm WLCSP
Applications
ƒ Cell Phones, Smart-Phones
ƒ Pocket PCs
ƒ WLAN DC-DC Converter Modules
ƒ PDA, DSC, PMP, and MP3 Players
ƒ Portable Hard Disk Drives
Description
The FAN5350 is a step-down switching voltage regulator
that delivers a fixed 1.82V from an input voltage supply
of 2.7V to 5.5V. Using a proprietary architecture with
synchronous rectification, the FAN5350 is capable of
delivering 600mA at over 90% efficiency, while
maintaining a very high efficiency of over 80% at load
currents as low as 1mA. The regulator operates at a
nominal fixed frequency of 3MHz at full load, which
reduces the value of the external components to 1µH for
the output inductor and 4.7µF for the output capacitor.
At moderate and light loads, pulse frequency modulation
is used to operate the device in power-save mode with a
typical quiescent current of 16µA. 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.
The FAN5350 is available in a 6-lead Molded Leadless
Package (MLP) and a 5-bump Wafer Level Chip Scale
Package (WLCSP).
Ordering Information
Part Number Pb-Free
Operating
Temperature Range
Package
Packing Method
FAN5350UCX
Yes
-40°C to 85°C
WLCSP-5 1x1.37mm
Tape and Reel(1)
FAN5350MPX
Yes
-40°C to 85°C
MLP-6 3 x 3mm
Tape and Reel(1)
Note:
1. Please refer to tape and reel specifications on www.fairchildsemi.com; http://www.fairchildsemi.com/packaging.
© 2007 Fairchild Semiconductor Corporation
FAN5350 Rev. 1.0.0
www.fairchildsemi.com



FAN5350
www.DataSheet4U.com
Typical Applications
4.7µF
VIN
CIN
VIN GND
A1 A3
B2 SW
L1
EN C1 C3 FB
1µH
4.7µF
VOUT
C OUT
Figure 1. WLCSP (top view)
PGND 1
AGND 2
VOUT
FB 3
4.7µF
COUT
P1
(GND)
L1
Η
6 VIN
5 SW
4 EN
VIN
4.7µF
C IN
Figure 2. MLP (top view)
Block Diagram
EN Bias
Current Limit
VIN
1.8V
Reference
+
Modulator
Logic
Driver
FB -
SW
3MHz OSC
Zero Crossing
Figure 3. Block Diagram
GND
© 2007 Fairchild Semiconductor Corporation
FAN5350 Rev. 1.0.0
2
www.fairchildsemi.com







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