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부품번호 | FAN5350 기능 |
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기능 | 3MHz 600mA DC/DC Buck Converter | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 15 페이지수
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
www.DataSheet4U.com
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
Parameter
Input Voltage with respect to GND
VIN Voltage on any other pin with respect to GND
TJ
TSTG
TL
ESD
Junction Temperature
Storage Temperature
Lead Temperature (Soldering 10 Seconds)
Electrostatic Discharge Protection Level
Human Body Model
Charged Device Model
Min.
-0.3
-0.3
-40
-65
4
2
Max.
6.0
VIN
150
150
260
Unit
V
V
°C
°C
°C
kV
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
VCC
IOUT
L
CIN
COUT
TA
TJ
Parameter
Supply Voltage Range
Output Current
Inductor
Input Capacitor
Output Capacitor
Operating Ambient Temperature
Operating Junction Temperature
Min.
2.7
0
0.7
3.3
3.3
-40
-40
Typ.
1.0
4.7
4.7
Max.
5.5
600
3.0
12.0
12.0
+85
+125
Unit
V
mA
µH
µF
µF
°C
°C
Thermal Properties
Symbol Parameter
Min.
Typ.
Max.
Units
ΘJA_WLCSP
ΘJA_MLP
Junction-to-Ambient Thermal Resistance(2)
Junction-to-Ambient Thermal Resistance(2)
180
49
°C/W
°C/W
Note:
2. Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with
four-layer 1s2p boards in accordance to JESD51- JEDEC standard. Special attention must be paid not to exceed
junction temperature TJ(max) at a given ambient temperate TA.
© 2007 Fairchild Semiconductor Corporation
FAN5350 Rev. 1.0.0
4
www.fairchildsemi.com
4페이지 www.DataSheet4U.com
Applications Information
Selecting the Inductor
The output inductor must meet both the required
inductance and the energy handling capability of the
application.
The inductor value affects the average current limit, the
PWM-to-PFM transition point, the output voltage ripple,
and the efficiency.
The ripple current (∆I) of the regulator is:
ΔI ≈
VOUT
VIN
•
⎜⎜⎝⎛
VIN
L
− VOUT
• FSW
⎟⎟⎠⎞
EQ. 1
The maximum average load current, IMAX(LOAD) is related
to the peak current limit, ILIM(PK) (see figure 17) by the
ripple current:
IMAX(LOAD)
= ILIM(PK)
−
ΔI
2
EQ. 2
The transition between PFM and PWM operation is
determined by the point at which the inductor valley
current crosses zero. The regulator DC current when the
inductor current crosses zero, IDCM, is:
IDCM
=
ΔI
2
EQ. 3
The FAN5350 is optimized for operation with L=1μH, but
is stable with inductances ranging from 700nH to 3.0μH.
The inductor should be rated to maintain at least 80% of
its value at ILIM(PK).
Efficiency is affected by the inductor DCR and
inductance value. Decreasing the inductor value for a
given physical size typically decreases the DCR; but
since ∆I increases, the RMS current increases, as do
the core and skin effect losses.
IRMS =
IOUT(DC) 2
+
ΔI2
12
EQ. 4
The increased RMS current produces higher losses
through the RDS(ON) of the IC MOSFETs as well as the
inductor ESR.
Increasing the inductor value produces lower RMS
currents, but degrades transient response. For a given
physical inductor size, increased inductance usually
results in an inductor with lower saturation current.
Table 1 shows the effects of inductance higher or lower
than the recommended 1μH on regulator performance.
Output Capacitor
Table 2 suggests 0603 capacitors. 0805 capacitors may
further improve performance in that the effective
capacitance is higher and ESL is lower than 0603. This
improves the transient response and output ripple.
Increasing COUT has no effect on loop stability and can
therefore be increased to reduce output voltage ripple or
to improve transient response. Output voltage ripple,
∆VOUT, is:
ΔVOUT
=
ΔI
•
⎜⎜⎝⎛
8
•
1
COUT
•
FSW
+ ESR⎟⎟⎠⎞
EQ. 5
Input Capacitor
The 4.7μF ceramic input capacitor should be placed as
close as possible between the VIN pin and GND to
minimize the parasitic inductance. If a long wire is used
to bring power to the IC, additional “bulk” capacitance
(electrolytic or tantalum) should be placed between CIN
and the power source lead to reduce ringing that can
occur between the inductance of the power source leads
and CIN.
Inductor Value IMAX(LOAD) EQ. 2
ILIM(PK)
∆VOUT EQ. 5
Transient Response
Increase
Increase
Decrease
Decrease
Degraded
Decrease
Decrease
Increase
Increase
Improved
Table 1. Effects of changes in inductor value (from 1µH recommended value) on regulator performance
© 2007 Fairchild Semiconductor Corporation
FAN5350 Rev. 1.0.0
7
www.fairchildsemi.com
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부품번호 | 상세설명 및 기능 | 제조사 |
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