LP3970

Power Management Unit for Advanced Application

Processors

General Description

The LP3970 is a multi-function, programmable Power Man-

agement Unit, designed especially for advanced application

processors. The LP3970 has been optimized for low power

handheld applications PMU provides 11 low dropout, low

noise linear regulators, two DC/DC magnetic buck regula-

tors, a back-up battery charger and 4 GPO’s. A high speed

serial interface is included to program individual regulator

output voltages as well on/off control.

Key Specifications

Buck regulators

n

Programmable V

n

Up to 95% Efficiency

n

600 mA output current

n

+3% output voltage accuracy

LDO’s

n

Programmable V

n

+3% output voltage accuracy

n

100/150/300 mA output current

n

100 mV (typ) Dropout

Features

n

Compatible with advanced applications processors

n

Additional buck regulator for powering high current

peripheral devices

n

11 LDOs for powering Internal processor functions and

I/O’s

n

Backup battery charger for Lithium and

Lithium-Manganese coin cell batteries

n

Automatic switching to backup battery

n

High speed serial interface for independent control of

device functions and settings

n

Precision internal reference

n

Thermal overload protection

n

Current overload protection

n

48-lead 7x7x0.8 mm LLP package

n

Software Programmable Low Noise LDO’s

Applications

n

PDA phones

n

Smart phones

n

Personal Media Players

n

Digital Cameras

Simplified Application Circuit

20137101

ADVANCE INFORMATION

January 2005

© 2005 National Semiconductor Corporation

DS201371

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