WM8311 Datasheet, PDF (100/302 Pages) Wolfson Microelectronics plc – Processor Power Management Subsystem

WM8311
Pre-Production
The input voltage to these LDOs is provided on pin LDOnVDD for each of LDO1-5, 7 respectively.
The LDO input supply pins are typically connected to the SYSVDD voltage node, or else can be
connected to the output pin of one of the DC-DC buck converters. Note that the internal supply pins
PVDD1 and PVDD2 should also be connected to SYSVDD.
LDO11 is a configurable LDO intended for ‘always-on’ functions external to the WM8311. The
WM8311 contains a further two non-configurable LDOs which support internal functions only.
The connections to LDO Regulator 1 are illustrated in Figure 22. The equivalent circuit applies to
LDO2, LDO3, LDO4, LDO5 and LDO7.
Figure 22 LDO Regulator Connections
An input and output capacitor are recommended for each LDO Regulator, as illustrated above.
See Section 30.5 for details of specific recommended external components.
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PP, May 2012, Rev 3.1
100