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WM8321 датащи(PDF) 248 Page - Wolfson Microelectronics plc

номер детали WM8321
подробное описание детали  Processor Power Management Subsystem
PDF  253 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8321 датащи(HTML) 248 Page - Wolfson Microelectronics plc

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WM8321
Production Data
w
PD, February 2012, Rev 4.0
248
30.3.1 DC-DC3 / DC-DC4 DUAL MODE
When DC-DC3 and DC-DC4 are operating in dual mode, the external component configuration for
each converter is the same as previously noted for single converters. The output load connection
points (Vo) are simply connected together as shown in Figure 30.
WM8321
DC4_SLV = 1
DC3LX
DC3GND
DC3FB
VO
DC4VDD
2.7V – 5.5V
L
COUT
CIN
DC4LX
DC4FB
VO
L
COUT
DC3VDD
CIN
DC4GND
Load
Figure 30 DC-DC3 / DC-DC4 Dual Mode Converter Connections
Wolfson recommends the following external components for use with DC-DC Converters 3 and 4
when operating in Dual Mode.
The output capacitor must be consistent with the DCm_CAP register setting. For best performance,
the 47
F component is recommended. For typical applications, the 22F is suitable. The alternative
values may be used for size or cost reasons if preferred.
COMPONENT
VALUE
PART NUMBER
SIZE
L
2.2
H
Coilcraft LPS3015-222ML_
3 x 3 x 1.5mm
COUT
47
F
MuRata GRM21BR60G476MEA1
0805
22
F
MuRata GRM21BR60J226ME39
0805
10
F
MuRata GRM188R60J106ME84
0603
CIN
4.7
F
MuRata GRM188R60J475ME84
0603
Table 87 Recommended External Components - DC-DC3 / DC-DC4 Dual Mode



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