WM8311GEB/V Wolfson Microelectronics, WM8311GEB/V Datasheet - Page 3

• Manufacturer Part Number: WM8311GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 121BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8311GEB/V

• Supply Voltage: 5.5V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 7
• Digital Ic Case Style: BGA
• No. Of Pins: 121
• No. Of Regulated Outputs: 9
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Pre-Production
TYPICAL APPLICATIONS
w
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 step-down DC-DC converters and one
step-up DC-DC 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 step-down converters are specifically designed to handle rapid changes in load
current, as required by modern application processors; selectable operating modes allow the
converters to be optimally configured for light, heavy or transient load conditions; they can also 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 / cellular
handset 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-programmable OTP 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 battery supply is
also supported in order to maintain the Real Time Clock (RTC) in the absence of any other supplies.
The WM8311 provides a battery charger for the main battery aswell as the backup battery; these can
be powered from either the wall adapter or USB supplies.
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.
PP, December 2009, Rev 3.0
WM8311
3