LP3972_08 Datasheet, PDF (1/60 Pages) National Semiconductor (TI) – Power Management Unit for Advanced Application Processors

January 11, 2008
LP3972
Power Management Unit for Advanced Application
Processors
General Description
The LP3972 is a multi-function, programmable Power Man-
agement Unit, designed especially for advanced application
processors. The LP3972 is optimized for low power handheld
applications and provides 6 low dropout, low noise linear reg-
ulators, 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
■ ^{Programmable V}_OUT ^{from 0.725 to 3.3V}
■ ^{Up to 95% efficiency}
■ ^{Up to 1.6A output current}
■ ^{±3% output voltage accuracy}
LDO’s
■ ^{Programmable V}_OUT ^{of 1.0V–3.3V}
■ ^{±3% output voltage accuracy}
■ ^{150/300/400 mA output currents}
— LDO RTC 30 mA
— LDO 1 300 mA
— LDO 2 150 mA
— LDO 3 150 mA
— LDO 4 150 mA
— LDO 5 400 mA
■ ^{100 mV (typ) dropout}
Features
■ ^{Compatible with advanced applications processors}
requiring DVM (Dynamic Voltage Management)
■ ^{Three buck regulators for powering high current processor}
functions or I/O's
■ ^{6 LDO's for powering RTC, peripherals, and I/O's}
■ ^{Backup battery charger with automatic switch for lithium-}
manganese coin cell batteries and Super capacitors
■ ^{I2C compatible high speed serial interface}
■ ^{Software control of regulator functions and settings}
■ ^{Precision internal reference}
■ ^{Thermal overload protection}
■ ^{Current overload protection}
■ ^{Tiny 40-pin 5x5 mm LLP package}
Applications
■ ^{PDA phones}
■ ^{Smart phones}
■ ^{Personal Media Players}
■ ^{Digital cameras}
■ ^{Application processors}
— Marvell PXA
— Freescale
— Samsung
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