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STW41414 Datasheet(PDF) 22 Page - STMicroelectronics

Part # STW41414
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 Datasheet(HTML) 22 Page - STMicroelectronics

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STw4141
Application information
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4.4
External clock synchronization
Figure 14.
Application using external clock synchronization
4.5
Checking transient response versus external components
The regulator loop response can be checked by looking at the load transient response.
Switching regulators take several cycles to respond to a step in load current. When a load
step occurs, VOUT is immediately shifted by an amount equal to ILOAD x ESR, where ESR is
the equivalent series resistance of COUT. ILOAD also begins to charge or discharge COUT
generating a feedback error signal used by the regulator to return VOUT to its steady-state
value. In order to improve the transient response, it is better to use two 10
µF ceramic
capacitors on each output to reduce ESR.
4.6
Bill of Material
4.6.1
Inductor selection
The choice of which inductor to use depends on the price and size versus performance
required with the STw4141 application.
Table 7 shows some typical surface mount inductors
that work well in STw4141 applications.
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
C
1
100 nF
C
2
100 nF
MODE_INFO
CLK
SLEEP
AUTO
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
C
1
100 nF
C
2
100 nF
MODE_INFO
CLK
SLEEP
AUTO
Table 8.
Bill of material: inductor selection
Part number
Supplier
Value
(µH)
RDC
(
Ω)
Max DC
current
(mA)
Size (mm)
W x L x H
VFL4012A-4R7M1R1
TDK
4.7
0.14
1100
3.5 x 3.7 x 1.2
VFL3012A-4R7MR74
TDK
4.7
0.16
740
2.6 x 2.8 x 1.2
744031004
WUERTH
4.7
0.085
900
3.8 x 3.8 x 1.8



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