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WM8325 Datasheet(PDF) 248 Page - Wolfson Microelectronics plc

Part # WM8325
Description  Processor Power Management Subsystem
PDF  254 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8325 Datasheet(HTML) 248 Page - Wolfson Microelectronics plc

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WM8325
Production Data
w
PD, February 2012, Rev 4.0
248
Wolfson recommends the following external components for use with DC-DC Converter 2.
The output inductor must be consistent with the DC2_FREQ register setting. The supported
configurations are listed in Table 86. Note that for output voltages greater than 1.4V, the 2MHz mode
must be used.
DC2_FREQ
SWITCHING
FREQUENCY
OUTPUT
INDUCTOR
COMMENTS
00
n/a
n/a
n/a
01
2MHz
2.2
H
Best efficiency
10
4MHz
1.0
H
Best transient performance
11
n/a
n/a
n/a
Table 86 Output Inductor Selection - DC-DC2
The output capacitor must be consistent with the DC2_CAP register setting. For best performance,
the 47
F component is recommended. For typical applications, the 22F is suitable; this is the
minimum recommended output capacitor value.
COMPONENT
VALUE
PART NUMBER
SIZE
L
1
H
Coilcraft XFL4020-102ME_
4 x 4 x 2.1mm
2.2
H
TDK VLC5045-2R2N
5 x 5 x 4.5mm
2.2
H
Coilcraft XAL4030-222ME_
4 x 4 x 3.1mm
COUT
47
F
MuRata GRM21BR60G476MEA1
0805
22
F
MuRata GRM21BR60J226ME39
0805
CIN
22
F
MuRata GRM21BR60J226ME39
0805
Table 87 Recommended External Components - DC-DC2
Wolfson recommends the following external components for use with DC-DC Converters 3 and 4.
Note that the switching frequency of DC-DC3 and DC-DC4 is fixed at 2MHz and the output inductor
must be 2.2
H in all cases.
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 88 Recommended External Components - DC-DC3, DC-DC4



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