Production Data
WM8321
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 2.2H in all cases.
The output capacitor must be consistent with the DCm_CAP register setting. For best performance,
the 47F component is recommended. For typical applications, the 22F is suitable. The alternative
values may be used for size or cost reasons if preferred.
COMPONENT
VALUE
2.2H
47F
PART NUMBER
SIZE
3 x 3 x 1.5mm
0805
L
Coilcraft LPS3015-222ML_
COUT
MuRata GRM21BR60G476MEA1
MuRata GRM21BR60J226ME39
MuRata GRM188R60J106ME84
MuRata GRM188R60J475ME84
22F
0805
10F
0603
CIN
4.7F
0603
Table 86 Recommended External Components - DC-DC3, DC-DC4
PD, February 2012, Rev 4.0
247
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
