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PDF FAN5350 Data sheet ( Hoja de datos )
| Número de pieza | FAN5350 | |
| Descripción | 3MHz 600mA DC/DC Buck Converter | |
| Fabricantes | Fairchild Semiconductor | |
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www.DataSheet4U.com
June 2007
FAN5350
3MHz, 600mA Step-Down DC-DC Converter in
Chip-Scale Packaging
Features
3MHz Fixed-Frequency Operation
16µA Typical Quiescent Current
600mA Output Current Capability
2.7V to 5.5V Input Voltage Range
1.82V Fixed Output Voltage
Synchronous Operation
Power-Save Mode
Soft-Start Capability
Input Under-Voltage Lockout (UVLO)
Thermal Shutdown and Overload Protection
6-Lead 3 x 3mm MLP
5-Bump 1 x 1.37mm WLCSP
Applications
Cell Phones, Smart-Phones
Pocket PCs
WLAN DC-DC Converter Modules
PDA, DSC, PMP, and MP3 Players
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
1 page  
www.DataSheet4U.com
Electrical Characteristics
Minimum and maximum values are at VIN = 2.7V to 5.5V, TA = -40°C to +85°C, CIN = COUT = 4.7µF, L = 1µH, unless
otherwise noted. Typical values are at TA = 25°C, VIN =3.6V.
Symbol
Parameter
Conditions
Min. Typ. Max. Units
Power Supplies
IQ
I(SD)
VUVLO
Quiescent Current
Shutdown Supply Current
Under-Voltage Lockout Threshold
Device is not switching, EN=VIN
Device is switching, EN=VIN
VIN = 3.6V, EN = GND
Rising Edge
Falling Edge
1.8
1.75
16
18
0.05
25
1.00
2.1
1.95
V(ENH) Enable HIGH-Level Input Voltage
V(ENL) Enable LOW-Level Input Voltage
I(EN) Enable Input Leakage Current
Oscillator
EN = VIN or GND
1.2
0.4
0.01 1.00
f0SC Oscillator Frequency
Regulation
2.5 3.0 3.5
VO Output Voltage Accuracy
ILOAD = 0 to 600mA
CCM
1.775
1.784
1.820
1.820
1.865
1.856
tSS Soft-Start
Output Driver
EN = 0 -> 1
300
RDS(on)
ILIM
PMOS On Resistance
NMOS On Resistance
PMOS Peak Current Limit
VIN = VGS = 3.6V
VIN = VGS = 3.6V
Open-Loop(3)
180
170
650 800 900
TTSD Thermal Shutdown
CCM Only
150
THYS Thermal Shutdown Hysteresis
20
Note:
3. The Electrical Characteristics table reflects open-loop data. Refer to Operation Description and Typical
Characteristic for closed-loop data.
µA
µA
µA
V
V
V
µA
MHz
V
V
µs
mΩ
mΩ
mA
°C
°C
© 2007 Fairchild Semiconductor Corporation
FAN5350 Rev. 1.0.0
5
www.fairchildsemi.com
5 Page 
www.DataSheet4U.com
Typical Performance Characteristics (Continued)
VIN = 3.6V, TA = 25°C, VEN = VIN, according to the circuit in Figure 1 or Figure 2, unless otherwise specified.
IL, 0.5A / div.
IL, 0.5A / div.
VOUT, 0.5V / div.
VOUT, 0.5V / div.
EN, 5.0V / div.
H scale: 20µs / div.
Figure 20. Start-Up, Full Load
EN, 5.0V / div.
H scale: 10µs / div.
Figure 21. Start-Up, No Load
VOUT(ac), 20mV / div.
VOUT(ac), 20mV / div.
IL, 0.5A / div.
IL, 0.5A / div.
H scale: 1µs / div.
H scale: 1µs / div.
Figure 22. Fast Load Transient, No Load to Full Load Figure 23. Fast Load Transient, Full Load to No Load
VSW, 5V / div.
VOUT(ac), 20mV / div.
ILOAD = 600mA
H scale: 20µs / div.
ILOAD = 300mA
Figure 24. Fast Load Transient in CCM
VSW, 5V / div.
VOUT(ac), 20mV / div.
ILOAD = 50mA
H scale: 20µs / div.
ILOAD = 1mA
Figure 25. Fast Load Transient in DCM
© 2007 Fairchild Semiconductor Corporation
FAN5350 Rev. 1.0.0
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet FAN5350.PDF ] | |
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