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FAN5354MPX 데이터시트(PDF) 2 Page - Fairchild Semiconductor

부품명 FAN5354MPX
상세설명  3MHz, 3A Synchronous Buck Regulator
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5354 • Rev. 1.0.4
2
Table 1. Recommended External Components for 3A Maximum Load Current
Component
Description
Vendor
Parameter
Typ.
Units
L1
470nH Nominal
IHLP1616ABER47M01 (Vishay)
SD12-R47-R (Coiltronics)
VLC5020T-R47N (TDK)
(TDK)
LQH55PNR47NT0 (Murata)
L
0.47
μH
DCR
20
m
Ω
COUT
2 Pieces
10
μF, 6.3V, X5R, 0805
GRM21BR60J106M (Murata)
C2012X5R0J106M (TDK)
C
10.0
μF
CIN
10
μF, 6.3V, X5R, 0805
CIN1
10nF, 25V, X7R, 0402
GRM155R71E103K (Murata)
C1005X7R1E103K (TDK)
C
10
nF
CVCC
4.7
μF, 6.3V, X5R, 0603
GRM188R60J475K (Murata)
C1608X5R0J475K (TDK)
C
4.7
μF
R3
(1)
Resistor: 1
Ω 0402
Any
R
1
Ω
Note:
1.
R3 is optional and improves IC power supply noise rejection. See Layout recommendations for more information.
Pin Configuration
FB
VOUT
PGND
PGND
SW
SW
MODE
PGOOD
EN
VCC
PVIN
PVIN
6
5
4
3
2
1
7
8
9
10
11
12
P1
(GND)
Figure 2. 12-Pin, 3x3.5mm MLP (Top View)
Pin Definitions
Pin #
Name
Description
1
FB
FB. Connect to resistor divider. The IC regulates this pin to 0.8V.
2
VOUT
VOUT. Sense pin for VOUT. Connect to COUT.
3, 4
PGND
Power Ground. Low-side MOSFET is referenced to this pin. CIN and COUT should be returned with a
minimal path to these pins.
5, 6
SW
Switching Node. Connect to inductor.
P1
GND
Ground. All signals are referenced to this pin.
7, 8
PVIN
Power Input Voltage. Connect to input power source. Connect to CIN with minimal path.
9
VCC
IC Bias Supply. Connect to input power source. Use a separate bypass capacitor CVCC from this pin
to the P1 GND terminal between pins 1 and 12.
10
EN
Enable. The device is in shutdown mode when this pin is LOW. Do not leave this pin floating.
11
PGOOD
Power Good. This open-drain pin pulls LOW if the output falls out of regulation or is in soft-start.
12
MODE
MODE / Sync. A logic 0 allows the IC to automatically switch to PFM during light loads. When held
HIGH, the IC to stays in PWM mode. The regulator also synchronizes its switching frequency to the
frequency provided on this pin. Do not leave this pin floating.
Note:
2.
P1 is the bottom heat-sink pad. Ground plane should flow through pins 3, 4, and P1 and can be extended through pin 11 if
PGOOD’s function is not required, and through pin 12 if MODE is to be grounded, to improve IC cooling.


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