8 x LDO

Control

Serial

Interface

I/O

Interface

of

Baseband

Processor

Li - Ion Charger

AC Adapter/

USB

Ichg

Monitor

-

+

BB Processor

Power Domains

Memory

RF

Peripheral

Devices

Buck

LP3923

www.ti.com

SNVS567B – APRIL 2010 – REVISED MAY 2013

LP3923 Cellular Phone Power Management Unit

Check for Samples: LP3923

1

FEATURES

KEY SPECIFICATIONS

2

•

Integrated Li-Ion Battery Charger with Power

•

50 mA to 1200 mA Charging Current

FET, Thermal Regulation and 28V OVP

•

3.0V to 5.5V Input Voltage Range

•

Six Low-Noise LDOs, Two LILO LDOs

•

135 mV typ. Dropout Voltage @ 300 mA LDOs

–

3 x 300 mA

•

2% (typ.) Output Voltage accuracy on LDOs

–

4 x 150 mA

•

700 mA (typ.) Buck Regulator

–

1 x 80 mA

DESCRIPTION

•

One High Efficiency Synchronous Magnetic

The LP3923 is a fully Integrated Power Management

Unit (PMU) designed for CDMA cellular phones.

–

The LP3923 PMU contains a fully integrated Li-Ion

–

Auto Mode PFM/PWM Switch

battery charger with power FET and over-voltage-

–

Low Inductance 2.2 µH @ 2 MHz Clock

protection (OVP), one Buck regulator, 8 low-noise

•

low-dropout (LDO) voltage regulators, and a high-

Outputs and Charger Operation

speed serial interface to program on/off conditions

and output voltages of individual regulators, and to

•

Thermal Shutdown with Early Warning Alarm

read status information of the PMU. Two LILO (low-

•

Under-Voltage Lockout

input, low-output) type LDOs with separate power

•

30-bump 3.0 x 2.5 mm DSBGA Package

input provide an application option for pre-regulated

high efficient power management for longer battery

APPLICATIONS

life.

•

Cellular Handsets

System Diagram

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2010–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.