LP3971 Datasheet, PDF (1/57 Pages) National Semiconductor (TI) – POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS

LP3971
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SNVS432U – JANUARY 2006 – REVISED OCTOBER 2008
LP3971 Power Management Unit for Advanced Application Processors
Check for Samples: LP3971
FEATURES
1
•2 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
DESCRIPTION
The LP3971 is a multi-function, programmable Power Management Unit, designed especially for advanced
application processors. The LP3971 is optimized for low power handheld 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
Regulators
Programmable V_OUT from 0.725 to 3.3V
Up to 95% efficiency
Up to 1.6A output current
±3% output voltage accuracy
LDOs
Programmable V_OUT of 1.0V–3.3V
±3% output voltage accuracy
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
100 mV (typ) dropout
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2008, Texas Instruments Incorporated