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STW41414/T Datasheet(PDF) 21 Page - STMicroelectronics

Part # STW41414/T
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

STW41414/T Datasheet(HTML) 21 Page - STMicroelectronics

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Application information
STw4141
20/30
4.2
Automatic PWM/PFM mode
This user mode is designed to allow STw4141 to switch automatically between PWM and
PFM modes. This feature improves the application efficiency because STw4141 enters in
PFM mode according to application processor current consumption.
Figure 12.
Automatic PWM/PFM switch schematic example
4.3
User selected PWM/PFM mode
STw4141 PWM/PFM mode can also be controlled by the application processor. This feature
is accessible through MODE/SYNC pin state. It is useful to users who want to use STw4141
with the modem digital processor. Therefore, MODE/SYNC pin is connected to SLEEP
mobile phone signal.
Figure 13.
PWM/PFM forced mode schematic example
V
IN=2.7V to 5.5V
VOUT1
FB1
C
OUT1
22 µF
6.3 V
VOUT2
FB2
C
OUT2
22 µF
6.3 V
PVDD
C
IN
10 µF
6.3 V
PGND
VDD
EN
VLX1
VLX2
GND
MODE/SYNC
T_MODE
L 4.7 µH
STw4141
VSEL
STATE
B1
D3
D4
C2
C3
C1
A4
D1
B4
D2
B2
A2
A3
A1
B3
C4
APE I/O
APE CORE
GND
APPLICATION
PROCESSOR
MODE_INFO
SLEEP
AUTO
C
1
100 nF
C
2
100 nF
V
IN=2.7V to 5.5V
VOUT1
FB1
C
OUT1
22 µF
6.3 V
VOUT2
FB2
C
OUT2
22 µF
6.3 V
PVDD
C
IN
10 µF
6.3 V
PGND
VDD
EN
VLX1
VLX2
GND
MODE/SYNC
T_MODE
L 4.7 µH
STw4141
VSEL
STATE
B1
D3
D4
C2
C3
C1
A4
D1
B4
D2
B2
A2
A3
A1
B3
C4
APE I/O
APE CORE
GND
APPLICATION
PROCESSOR
MODE_INFO
SLEEP
AUTO
C
1
100 nF
C
2
100 nF
V
IN=2.7V to 5.5V
VOUT1
FB1
C
OUT1
22 µF
6.3 V
VOUT2
FB2
C
OUT2
22 µF
6.3 V
PVDD
C
IN
10 µF
6.3 V
PGND
VDD
EN
VLX1
VLX2
GND
MODE/SYNC
T_MODE
L 4.7 µH
STw4141
VSEL
STATE
B1
D3
D4
C2
C3
C1
A4
D1
B4
D2
B2
A2
A3
A1
B3
C4
APE I/O
APE CORE
GND
APPLICATION
PROCESSOR
MODE_INFO
SLEEP
AUTO
PWR_EN
C
1
100 nF
C
2
100 nF
V
IN=2.7V to 5.5V
VOUT1
FB1
C
OUT1
22 µF
6.3 V
VOUT2
FB2
C
OUT2
22 µF
6.3 V
PVDD
C
IN
10 µF
6.3 V
PGND
VDD
EN
VLX1
VLX2
GND
MODE/SYNC
T_MODE
L 4.7 µH
STw4141
VSEL
STATE
B1
D3
D4
C2
C3
C1
A4
D1
B4
D2
B2
A2
A3
A1
B3
C4
APE I/O
APE CORE
GND
APPLICATION
PROCESSOR
MODE_INFO
SLEEP
AUTO
PWR_EN
C
1
100 nF
C
2
100 nF



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