FAN5353 Fairchild Semiconductor, FAN5353 Datasheet - Page 2

• Manufacturer Part Number: FAN5353
• Description: The FAN5353 is a step-down switching voltage regulator that delivers an adjustable output from an input voltage supply of 2
• Manufacturer: Fairchild Semiconductor

© 2009 Fairchild Semiconductor Corporation
FAN5353 • Rev. 1.0.2
Table 1. Recommended External Components for 3A Maximum Load Current
Note:
1.
Pin Configuration
Pin Definitions
Note:
2.
Component
Pin #
3, 4
5, 6
7, 8
P1
10
11
12
1
2
9
R3 is optional and improves IC power supply noise rejection. See Layout recommendations for more information.
P1 is the bottom heat-sink pad. Ground plane should flow through pins 3, 4, 12, and P1 and can be extended through pin
11 if PGOOD’s function is not required to improve IC cooling.
C
C
R3
C
C
L1
OUT
VCC
IN1
IN
(1)
Name
PGOOD
PGND
VOUT
PVIN
GND
VCC
SW
EN
NC
FB
4.7μF, 6.3V, X5R, 0603
10μF, 6.3V, X5R, 0805
10μF, 6.3V, X5R, 0805
10nF, 25V, X7R, 0402
Resistor: 1Ω 0402
470nH nominal
Description
FB. Connect to resistor divider. The IC regulates this pin to 0.8V.
VOUT. Sense pin for VOUT. Connect to COUT.
Power Ground. Low-side MOSFET is referenced to this pin. CIN and COUT should be returned with a
minimal path to these pins.
Switching Node. Connect to inductor.
Ground. All signals are referenced to this pin.
Power Input Voltage. Connect to input power source. Connect to CIN with minimal path.
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.
Enable. The device is in shutdown mode when this pin is LOW. Do not leave this pin floating.
Power Good. This open-drain pin pulls LOW if the output falls out of regulation or is in soft-start.
This pin has no function and should be tied to GND.
Description
2 pieces
Figure 2. 12-Pin, 3x3.5mm MLP (Top View)
PGND
PGND
VOUT
Vishay
SW
SW
FB
MURATA LQH55PNR47NT0
GRM21BR60J106M (Murata)
GRM155R71E103K (Murata)
GRM188R60J475K (Murata)
TDK
C2012X5R0J106M (TDK)
C1005X7R1E103K (TDK)
C1608X5R0J475K (TDK)
Coiltronics SD12-R47-R
1
2
3
4
5
6
IHLP1616ABER47M01
(GND)
Vendor
VLC5020T-R47N
P1
2
any
12
11
10
9
8
7
NC
PGOOD
EN
VCC
PVIN
PVIN
Parameter
DCR
C
C
C
R
L
Typ.
0.47
10.0
4.7
20
10
1
www.fairchildsemi.com
Units
mΩ
μH
μF
nF
μF
Ω