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1FEATURES

2? USB Multiplexing Switches

– High-Speed USB on USB and UART Inputs

– Negative Voltage Rail on Audio Inputs

– Internal LDO for ID Detection and MIC Bias

– Compatible with USB Charging

Specification Rev. 1.1

– DSS Input for Default Switch Connection

– Low-Power MIC Standby Mode single?

Linear Charge with Single Input

– 28 OVP on VBUS Input

– High-Current Mode for Production Test

– Thermal Regulation

? Over-Voltage Protected LDO for USB

Transceivers and PMU Wakeup

? UVLO (Undervoltage Lock Out)

? Interrupt Request to Reduce SW Polling

– USB / ID Detection

– SEND / END Button Detection

– Mic Removal

– OVLO / UVLO on VBUS

– Charger Status

? Thermal Shutdown Protection

? I2C-compatible Serial Interface

? 25-Bump 0.4 mm Pitch Thin DSBGA Package

APPLICATIONS

? GSM, GPRS, EDGE, CDMA & WCDMA

handsets

? Portable Media Players / MP3 Players

DESCRIPTION

The LP8727 is designed to provide automatic multiplexing switches between Micro/Mini USB

connector and USB, UART and Audio paths in

cellular phone applications. It also contains a single?

input Li-Ion battery charger and an overvoltageprotected

LDO. Programming is handled via an I2C-

compatible Serial Interface allowing control of

charger, multiplexing switches, and reading status

information of the device.

The multiplexing switches on USB and UART support

high-speed USB, and Audio inputs can be driven to

negative voltage rail. The LP8727 is compatible with

USB charging specifications rev 1.1 from USB IF.

The Li-Ion charger requires few external components

and integrates the power FET. Charging is thermally

regulated to obtain the most efficient charging rate for

a given ambient temperature. It has Overvoltage

Protection (OVP) circuit at the charger input protects

the PMU from input voltages up to +28V, eliminating

the need for any external protection circuitry.

An overvoltage-protected LDO which can supply up

to 50 mA is designed for powering up a low-voltage

USB transceiver or waking up a PMU (Power

Management Unit) when an external power source

(either USB VBUS or wall adapter) is connected to

the USB connector.

The LP8727 PMU is available in 25-bump 0.4 mm

pitch thin DSBGA package (2.015 mm x 2.015 mm).