WM8311 datasheet(3/302 Pages) WOLFSON

3 / 302 page

Pre-Production

WM8311

PP, May 2012, Rev 3.1

TYPICAL APPLICATIONS

The WM8311 is designed as a system PMIC device that manages multiple power supply paths (wall

adapter, USB, battery) and generates configurable DC supplies to power processors and associated

peripherals within a system. The WM8311 provides three DC-DC synchronous buck (step-down)

converters and one DC-DC boost (step-up) converter. Seven LDO regulators provide a high degree of

flexibility to provide power to multiple devices, with the capability to power-up and power-down

different circuits independently.

Two of the DC-DC buck converters incorporate Wolfson’s BuckWise™ technology specifically

designed to handle rapid changes in load current; programmable slew rate DVS is also provided, as

required by modern application processors. Selectable operating modes on all of the DC-DC

converters allow each converter to be optimally configured for light, heavy or transient load

conditions. Flexible operating configurations allow the converters to be tailored for minimum PCB

area, maximum performance, or for maximum efficiency. The analogue LDOs provide low-noise

outputs suitable for powering sensitive circuits such as RF / Wi-Fi / bluetooth radio applications.

The WM8311 powers up the converters and LDOs according to a programmable sequence. A

configurable ‘SLEEP’ state is also available, providing support for an alternate configuration, typically

for low-power / standby operation. The power control sequences and many other parameters can be

stored in an integrated user-configurable OTP (One-Time Programmable) memory or may be loaded

from an external memory. The WM8311 supports the programming and verification of the integrated

OTP memory.

The WM8311 provides power path management which seamlessly switches between wall adapter,

USB and battery power sources according to the prevailing conditions. A backup power source is also

supported in order to maintain the Real Time Clock (RTC) in the absence of any other supplies. The

WM8311 provides a configurable battery charger for the main battery, powered from either the wall

adapter or USB supplies. The backup power source is maintained using a constant-voltage output

from the WM8311.

Programmable GPIO pins may be configured as hardware inputs for general use or for selecting

different power management configurations. As outputs, the GPIOs can provide indications of the

device status, or may be used as control signals for other power management circuits. The WM8311

also provides two LED drivers, which can be controlled manually or configured as status indicators for

the OTP memory programmer, operating power state or battery charger.

WM8311 Datasheet(PDF) 3 Page - Wolfson Microelectronics plc