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WM8352 Datasheet(PDF) 327 Page - Wolfson Microelectronics plc

Part # WM8352
Description  Wolfson AudioPlus™ Stereo CODEC with Power Management
PDF  336 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8352 Datasheet(HTML) 327 Page - Wolfson Microelectronics plc

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Production Data
WM8352
w
PD, February 2011, Rev 4.4
327
When selecting a suitable output inductor, the inductance value and the saturation current must be
compatible with the operating conditions of the converter.
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 Converters 1 and 6.
Note that the choice of output capacitor should be determined as described above.
COMPONENT
VALUE
PART NUMBER
SIZE
L
2.2
μH
Coilcraft LPS3010-222ML (1.4A)
COUT
10
μF
Murata GRM219R60J106KE19B
0805
22
μF
Murata GRM21BR60J226M
0805
47
μF
Murata GRM31CR60J476M
1206
100
μF
Murata GRM31CR60J107M
1206
CIN
4.7
μF
Murata GRM188R60J475KE19D
0603
Table 157 Recommended External Components - DC-DC1 and DC-DC6
Wolfson recommends the following external components for use with DC-DC Converters 3 and 4.
COMPONENT
VALUE
PART NUMBER
SIZE
L
2.2
μH
Murata LQM31PN2R2M00 (0.9A)
1206
COUT
10
μF
Murata GRM219R60J106KE19B
0805
CIN
4.7
μF
Murata GRM188R60J475KE19D
0603
Table 158 Recommended External Components - DC-DC3 and DC-DC4



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