WM8352 datasheet(2/336 Pages) WOLFSON

2 / 336 page

WM8352

Production Data

PD, February 2011, Rev 4.4

TYPICAL APPLICATIONS

The WM8352 is a complete audio and power management solution for portable media devices. The

device incorporates four programmable step-down switching regulators, two step-up switching

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

also serve as hot-swap outputs, a backup supply regulator, two programmable white LED drivers, 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

WM8352 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 WM8352 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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