LP3971 Datasheet, PDF (1/42 Pages) National Semiconductor (TI) – 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.
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
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 I²C 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
Applications
n PDA phones
n Smart phones
n Personal Media Players
n Digital cameras
n Application processors
— Intel Xscale
— Freescale
— Samsung
© 2006 National Semiconductor Corporation DS201807
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