LP5551 Datasheet, PDF (1/38 Pages) National Semiconductor (TI) – PowerWise™ Technology Compliant Energy Management Unit

LP5551
www.ti.com
SNVS417B – DECEMBER 2006 – REVISED APRIL 2013
LP5551 PowerWise™ Technology Compliant Energy Management Unit
Check for Samples: LP5551
FEATURES
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•23 2 300 mA Buck Regulators Operate 180
Degrees out of Phase for Reduced EMI
• 1 MHz PWM Switching Frequency
• 4 Programmable LDOs Ideal for I/O (Two of
These), PLL, and Memory Retention Supply
Generation
• Supports High-Efficiency PowerWise
Technology Adaptive Voltage Scaling
• PWI Open Standard Interface for System
Power Management
• Digitally Controlled Intelligent Voltage Scaling
• Auto or PWI Controlled PFM Mode Transition
• Internal Soft Start/Startup Sequencing
• Adjustable P- and N- Well Bias Supply for
Threshold Scaling
• Power OK Output
APPLICATIONS
• Dual Core Processors
• GSM/GPRS/EDGE & UMTS Cellular Handsets
• Hand-Held Radios
• PDAs
• Battery Powered Devices
• Portable Instruments
DESCRIPTION
The LP5551 is a PWI 1.0 compliant Energy
Management System for reducing power
consumption of stand-alone mobile phone processors
such as base-band or applications processors.
The LP5551 contains two advanced, digitally
controlled switching regulators for supplying variable
voltage to processor core and memory. Two
regulators provide P- and N- well biasing for
threshold scaling applications. The device also
integrates 4 programmable LDO-regulators for
powering I/O, PLLs and maintaining memory
retention in shutdown-mode.
The device is controlled via the PWI open-standard
interface. The LP5551 operates cooperatively with
PowerWise™ technology compatible processors to
optimize supply voltages adaptively over process and
temperature variations or dynamically using
frequency/voltage pre-characterized look-up tables
and provides P- and N-well biasing for threshold
scaling.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerWise is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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 © 2006–2013, Texas Instruments Incorporated