LP3970 Datasheet, PDF (1/2 Pages) National Semiconductor (TI) – Power Management Unit for Advanced Application Processors

ADVANCE INFORMATION
January 2005
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_OUT from 0.8 to 3.5 V
n Up to 95% Efficiency
n 600 mA output current
n +3% output voltage accuracy
LDO’s
n Programmable V_OUT of 1.5-3.3 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
© 2005 National Semiconductor Corporation DS201371
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