LP3970 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鈥檚. A high speed
serial interface is included to program individual regulator
output voltages as well on/off control.
Features
n
Compatible with advanced applications processors
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Additional buck regulator for powering high current
peripheral devices
n
11 LDOs for powering Internal processor functions and
I/O鈥檚
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
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Software Programmable Low Noise LDO鈥檚
Key Specifications
Buck regulators
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Programmable V
OUT
from 0.8 to 3.5 V
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Up to 95% Efficiency
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600 mA output current
n
+3% output voltage accuracy
LDO鈥檚
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
Applications
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n
n
n
PDA phones
Smart phones
Personal Media Players
Digital Cameras
Simplified Application Circuit
20137101
漏 2005 National Semiconductor Corporation
DS201371
www.national.com
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