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WM8351 Datasheet(PDF) 321 Page - Wolfson Microelectronics plc

Part # WM8351
Description  Wolfson AudioPlus??Stereo CODEC with Power Management
PDF  330 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8351 Datasheet(HTML) 321 Page - Wolfson Microelectronics plc

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Production Data
WM8351
w
PD, April 2012, Rev 4.5
321
The magnitude of the inductor current ripple is dependant on the inductor value and can be
determined by the following equation:
As a minimum requirement, the DC current rating should be equal to the maximum load current plus
one half of the inductor current ripple:
To be suitable for the application, the chosen inductor must have a saturation current that is higher
than the peak inductor current given by the above equation. To maximise the converter efficiency, the
inductor should also have a low DC Resistance (DCR), resulting in minimum conduction losses. Care
should also be taken to ensure that the inductor is effective at the applicable operating temperature.
Wolfson recommends the following external components for use with DC-DC Converter 1. Note that
the choice of output capacitor should be determined as described above.
COMPONENT
VALUE
PART NUMBER
SIZE
L
2.2
H
Coilcraft LPS3010-222ML (1.4A)
COUT
10
F
Murata GRM219R60J106KE19B
0805
22
F
Murata GRM21BR60J226M
0805
47
F
Murata GRM31CR60J476M
1206
100
F
Murata GRM31CR60J107M
1206
CIN
4.7
F
Murata GRM188R60J475KE19D
0603
Table 157 Recommended External Components - DC-DC1
Wolfson recommends the following external components for use with DC-DC Converters 3 and 4.
COMPONENT
VALUE
PART NUMBER
SIZE
L
2.2
H
Murata LQM31PN2R2M00 (0.9A)
1206
COUT
10
F
Murata GRM219R60J106KE19B
0805
CIN
4.7
F
Murata GRM188R60J475KE19D
0603
Table 158 Recommended External Components - DC-DC3 and DC-DC4



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