STW4141 STMicroelectronics, STW4141 Datasheet - Page 23

• Manufacturer Part Number: STW4141
• Description: Single Coil Dual Output Step Down Dc/dc Converter For Digital Base Band And Multimedia Processor Supply
• Manufacturer: STMicroelectronics

STw4141
4.7
PCB layout considerations
The Printed Circuit Board layout must include the following consideration:
Current paths carrying high currents (bold lines in
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
V
V
IN
IN
=2.7V to 5.5V
=2.7V to 5.5V
HIGH CURRENT PATH
HIGH CURRENT PATH
C
C
10 µF
10 µF
6.3 V
6.3 V
IN
IN
MODE/SYNC
MODE/SYNC
PVDD
PVDD
VDD
VDD
EN
EN
VSEL
VSEL
AUTO
AUTO
B1
B1
D3
D3
D4
D4
C2
C2
C3
C3
C1
C1
A2
A2
A1
A1
VLX1
VLX1
PGND
PGND
STw4141
STw4141
L 4.7 µH
L 4.7 µH
C4
C4
GND
GND
B3
B3
A3
A3
Figure 15
T_MODE
T_MODE
VLX2
VLX2
D1
D1
D2
D2
A4
A4
B4
B4
B2
B2
STATE
STATE
VOUT1
VOUT1
FB1
FB1
VOUT2
VOUT2
FB2
FB2
) must be wide and short to
Application information
C
C
22 µF
22 µF
6.3 V
6.3 V
C
C
22 µF
22 µF
6.3 V
6.3 V
OUT1
OUT1
OUT2
OUT2
V
V
V
V
OUT1
OUT1
OUT2
OUT2
=1.8V
=1.8V
=1.0V/1.2V
=1.0V/1.2V
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