WM8351CGEBSLASHV datasheet(2/330 Pages) WOLFSON

2 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

TYPICAL APPLICATIONS

Peripherals

WM8351

CPU

Power Management

Control

Logic

MCLK

DC-DCs

RTC

CODEC

LED

Drive

Battery

Charger

Digital

Interfaces

LDOs

Power Buses

Bus

Switching

USB

5V Line /

Charger

XTAL

The WM8351 is a complete audio and power management solution for portable media devices. The

device incorporates three programmable step-down switching regulators, a step-up switching

regulator, a full-featured battery charger, four Low Drop-Out (LDO) voltage regulators which can also

serve as hot-swap outputs, a backup supply regulator, a programmable white LED driver, a Real-

Time Clock (RTC) alongside a 32.768kHz (32kHz) oscillator capable of operating from a backup

battery, a 12-bit auxiliary ADC for precise measurements, a ROM-programmable power management

state machine and numerous protection features all in a single 7x7mm BGA package. When only

battery power is available, a battery switch provides power to all switching regulators (and some other

internal modules). When external power is applied (eg. from USB or Wall adapter), the WM8351

seamlessly transitions from battery power (a single-cell Lithium battery) to the applicable external

supply. The battery charger is then activated, all internal power for the device is drawn from the

appropriate external power source and the battery is disconnected from the load. Maximum battery

charge current and charge time are programmable. The USB power manager provides accurate

current limiting for the USB pin under all conditions. The hot-swap outputs (LDOs in current-limited

‘Switch Mode’ operation) are ideal for powering memory cards and other devices that can be inserted

while the system is fully powered.

The integrated Hi-Fi stereo CODEC incorporates preamps and a low-noise bias voltage for differential

microphones, and flexible pseudo-differential drivers for headphone and differential/single-ended line

outputs. External component requirements are reduced as no separate microphone or headphone

amplifiers are required. Digital filter options are available in the ADC and DAC paths, to cater for

application filtering. The WM8351 is capable of operating without any external clock, as it can derive

all required clocks from its internal crystal oscillator, RC clock, and Frequency Locked Loop. An

external low jitter clock may be required in some applications for high performance audio.

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