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STW41412 Datasheet(PDF) 24 Page - STMicroelectronics

Part # STW41412
Description  Single-coil dual-output step-down DC/DC converter for digital base band and multimedia processor supply
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STW41412 Datasheet(HTML) 24 Page - STMicroelectronics

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STw4141
Application information
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4.7
PCB layout considerations
The Printed Circuit Board layout must include the following consideration:
Current paths carrying high currents (bold lines in
Figure 15) must be wide and short to
minimize impedance in order to reduce looses and EMI.
Small currents flow through voltage paths. No specific care is requested about voltage paths
but it is recommended to follow the general rules for PCB routing to reduce influence of
external and internal interferences.
Figure 15.
Board layout track length and width
VOUT1
FB1
V
OUT1=1.8V
C
OUT1
22 µF
6.3 V
VOUT2
FB2
V
OUT2=1.0V/1.2V
C
OUT2
22 µF
6.3 V
PVDD
V
IN=2.7V to 5.5V
C
IN
10 µF
6.3 V
PGND
VDD
EN
VLX1
VLX2
GND
MODE/SYNC
T_MODE
AUTO
L 4.7 µH
STw4141
VSEL
STATE
B1
D3
D4
C2
C3
C1
A4
D1
B4
D2
B2
A2
A3
A1
B3
C4
HIGH CURRENT PATH
VOUT1
FB1
V
OUT1=1.8V
C
OUT1
22 µF
6.3 V
VOUT2
FB2
V
OUT2=1.0V/1.2V
C
OUT2
22 µF
6.3 V
PVDD
V
IN=2.7V to 5.5V
C
IN
10 µF
6.3 V
PGND
VDD
EN
VLX1
VLX2
GND
MODE/SYNC
T_MODE
AUTO
L 4.7 µH
STw4141
VSEL
STATE
B1
D3
D4
C2
C3
C1
A4
D1
B4
D2
B2
A2
A3
A1
B3
C4
HIGH CURRENT PATH



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