WM8311 datasheet(99/302 Pages) WOLFSON

99 / 302 page

Pre-Production

WM8311

PP, May 2012, Rev 3.1

Figure 21 DC-DC Boost Converter Connections

Note that the recommended output capacitor COUT varies according to the required output voltage.

The DC4_RANGE register field must be set according to the required output voltage.

See Section 30.4 for details of specific recommended external components.

15.16 LDO REGULATOR OPERATION

15.16.1 OVERVIEW

The WM8311 provides 7 LDO Regulators. One of these (LDO7) is a low-noise analogue LDO. One of

the LDO Regulators (LDO11) can be configured to be enabled even when the WM8311 is in the OFF

state. The principal characteristics of the LDO Regulators are shown below.

LDO1

LDO2, 3

LDO4, 5

LDO7

LDO11

Converter Type

General

Purpose

General

Purpose

General

Purpose

Analogue

General

Purpose

Input Voltage Range

1.5V to 5.5V (must be ≤ SYSVDD voltage)

1.71V to 5.5V

1.8V to 5.5V

Output Voltage Range

0.9V to 3.3V

1.0V to 3.5V

0.8V to 1.55V

Load Current Rating

Up to 300mA

Up to

200mA

Up to

100mA

Up to 200mA

Up to 25mA

Pass device

impedance @ 2.5V



n/a

Table 47 LDO Regulator Overview

15.16.2 LDO REGULATORS

The LDO Regulators are configurable circuits which generate accurate, low-noise supply voltages for

various system components. The LDO Regulators are dynamically programmable and can be re-

configured at any time. Two low power modes are provided for the general purpose LDOs 1-5; a

single low power mode is provided for the analogue LDO7; this enables the overall device power

consumption to be minimised at all times.

The LDOs (1-5, 7) 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.

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