WM8311GEB/V Wolfson Microelectronics, WM8311GEB/V Datasheet - Page 282

• Manufacturer Part Number: WM8311GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 121BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8311GEB/V

• Supply Voltage: 5.5V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 7
• Digital Ic Case Style: BGA
• No. Of Pins: 121
• No. Of Regulated Outputs: 9
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

WM8311
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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 component’s inductance is valid at the applicable
operating temperature.
Wolfson recommends the following external components for use with DC-DC Converters 1 and 2.
The output inductor must be consistent with the DCm_FREQ register settings. For 4MHz (best
transient performance) operation, the inductor must be 0.5μH. For 2MHz (best efficiency), the
inductor must be 2.2μH. Note that for output voltages greater than 1.4V, the 2MHz mode must be
used.
The output capacitor must be consistent with the DCm_CAP register settings. For best performance,
the 47μF component is recommended. For typical applications, the 22μF is suitable. The alternative
values may be used for size or cost reasons if preferred.
Table 115 Recommended External Components - DC-DC1, DC-DC2
Wolfson recommends the following external components for use with DC-DC Converter 3.
Note that the switching frequency of DC-DC3 is fixed at 2MHz and the output inductor must be 2.2μH
in all cases.
The output capacitor must be consistent with the DC3_CAP register setting. For best performance,
the 47μF component is recommended. For typical applications, the 22μF is suitable. The alternative
values may be used for size or cost reasons if preferred.
Table 116 Recommended External Components - DC-DC3
COMPONENT
COMPONENT
C
C
C
C
OUT
OUT
L
L
IN
IN
VALUE
VALUE
0.5μH
2.2μH
2.2μH
4.7μF
4.7μF
47μF
22μF
10μF
10μF
47μF
22μF
10μF
MuRata GRM21CR60J476ME15
MuRata GRM21CR60J476ME15
MuRata GRM21AR60J226UE80
MuRata GRM188R60J106ME84
MuRata GRM188R60J475ME84
MuRata GRM188R60J106ME84
MuRata GRM21AR60J226UE80
MuRata GRM188R60J106ME84
MuRata GRM188R60J475ME84
TDK VLS252012T-2R2M1R3
TDK VLS252012T-2R2M1R3
Coilcraft XPL2010-501MLB
Coilcraft LPS3010-222ML
Coilcraft LPS3010-222ML
PART NUMBER
PART NUMBER
PP, December 2009, Rev 3.0
2 x 1.25 x 1.2mm
2 x 1.25 x 1.2mm
2 x 2.5 x 1mm
3 x 3 x 1mm
3 x 3 x 1mm
SIZE
0805
0805
0603
0603
0603
SIZE
0805
0805
0603
0603
Pre-Production
282