LP3971 Power Management Unit for Advanced Application Processors
January 2006
LP3971
Power Management Unit for Advanced Application
Processors
General Description
The LP3971 is a multi-function, programmable Power Man-
agement Unit, designed especially for advanced application
processors. The LP3971 is optimized for low power hand-
held applications and provides 6 low dropout, low noise
linear regulators, three DC/DC magnetic buck regulators, a
back-up battery charger and two GPIO’s. A high speed serial
interface is included to program individual regulator output
voltages as well as on/off control.
Features
n
Compatible with advanced applications processors
requiring DVM (Dynamic Voltage Management)
n
Three buck regulators for powering high current
processor functions or I/O’s
n
6 LDO’s for powering RTC, peripherals, and I/O’s
n
Backup battery charger with automatic switch for
lithium-manganese coin cell batteries and Super
capacitors
n
I
2
C compatible high speed serial interface
n
Software control of regulator functions and settings
n
Precision internal reference
n
Thermal overload protection
n
Current overload protection
n
Tiny 40-pin 5x5 mm LLP package
Key Specifications
Buck Regulators
n
Programmable V
OUT
from 0.8 to 3.3V
n
Up to 95% efficiency
n
Up to 1.6A output current
n
±
3% output voltage accuracy
LDO’s
n
Programmable V
OUT
of 1.0V–3.3V
n
±
3% output voltage accuracy
n
150/300/370 mA output currents
— LDO RTC 30 mA
— LDO 1 300 mA
— LDO 2 150 mA
— LDO 3 150 mA
— LDO 4 150 mA
— LDO 5 370 mA
n
100 mV (typ) dropout
Applications
n
n
n
n
n
PDA phones
Smart phones
Personal Media Players
Digital cameras
Application processors
— Intel Xscale
— Freescale
— Samsung
© 2006 National Semiconductor Corporation
DS201807
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
