WM8351CGEB/RV WOLFSON [Wolfson Microelectronics plc], WM8351CGEB/RV Datasheet - Page 321

• Manufacturer Part Number: WM8351CGEB/RV
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Production Data
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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.
Table 157 Recommended External Components - DC-DC1
Wolfson recommends the following external components for use with DC-DC Converters 3 and 4.
Table 158 Recommended External Components - DC-DC3 and DC-DC4
COMPONENT
COMPONENT
C
C
C
C
L
OUT
L
OUT
IN
IN
VALUE
VALUE
100F
2.2H
2.2H
4.7F
4.7F
10F
22F
47F
10F
Murata LQM31PN2R2M00 (0.9A)
Murata GRM188R60J475KE19D
Murata GRM188R60J475KE19D
Coilcraft LPS3010-222ML (1.4A)
Murata GRM219R60J106KE19B
Murata GRM219R60J106KE19B
Murata GRM31CR60J476M
Murata GRM31CR60J107M
Murata GRM21BR60J226M
PART NUMBER
PART NUMBER
PD, April 2012, Rev 4.5
WM8351
SIZE
SIZE
0805
0805
1206
1206
0603
1206
0805
0603
321