WM8310 datasheet(98/291 Pages) WOLFSON

98 / 291 page

WM8310

Pre-Production

PP, May 2012, Rev 3.1

The LDOs 1-10 can also operate as current-limited switches, with no voltage regulation; this is useful

for ‘Hot Swap’ outputs, i.e. supply rails for external devices that are plugged in when the system is

already powered up - the current-limiting function prevents the in-rush current into the external device

from disturbing other system power supplies.

The input voltage to these LDOs is provided on pin LDO1VDD through to LDO10VDD 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 WM8310. The

WM8310 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 through to LDO10.

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.

WM8310 데이터시트(PDF) 98 Page - Wolfson Microelectronics plc