Production Data
WM8321
2.7V – 5.5V
DC3VDD
DC3FB
CIN
L
DC3LX
VO
COUT
DC3GND
WM8321
DC4VDD
DC4FB
DC4_SLV = 1
CIN
L
DC4LX
VO
Load
COUT
DC4GND
Figure 21 DC-DC3 / DC-DC4 Dual Mode Converter Connections
The recommended output capacitor COUT varies according to the required transient response. Note
that the DCm_CAP register field must be set according to the output capacitance on each DC-DC
Converter in order to achieve best performance.
See Section 30.3 for details of specific recommended external components.
15.15 LDO REGULATOR OPERATION
15.15.1 OVERVIEW
The WM8321 provides 11 LDO Regulators. Four of these are low-noise analogue LDOs. One of the
LDO Regulators (LDO11) can be configured to be enabled even when the WM8321 is in the OFF
state. The principal characteristics of the LDO Regulators are shown below.
LDO1
LDO2, 3
LDO4, 5, 6
LDO7, 8
LDO9, 10
LDO11
Converter Type
General
Purpose
General
Purpose
General
Purpose
Analogue
Analogue
General
Purpose
Input Voltage Range
Output Voltage Range
Load Current Rating
1.5V to 5.5V
0.9V to 3.3V
Up to 300mA
1.5V to 5.5V
0.9V to 3.3V
1.5V to 5.5V
0.9V to 3.3V
1.71V to 5.5V
1.0V to 3.5V
Up to 200mA
1.71V to 5.5V
1.0V to 3.5V
Up to 150mA
1.8V to 5.5V
0.8V to 1.55V
Up to 25mA
Up to
Up to
200mA
100mA
Pass device
1
1
2
1
2
n/a
impedance @ 2.5V
Table 43 LDO Regulator Overview
PD, February 2012, Rev 4.0
93
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
