LP5551 Datasheet, PDF (1/32 Pages) National Semiconductor (TI) – PowerWise™ Technology Compliant Energy Management Unit

December 2006
LP5551
PowerWise™ Technology Compliant Energy Management
Unit
General Description
The LP5551 is a PWI 1.0 compliant Energy Management
System for reducing power consumption of stand-alone mo-
bile phone processors such as base-band or applications
processors.
The LP5551 contains two advanced, digitally controlled
switching regulators for supplying variable voltage to proces-
sor core and memory. Two regulators provide P- and N- well
biasing for threshold scaling applications. The device also in-
tegrates 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™ tech-
nology compatible processors to optimize supply voltages
adaptively over process and temperature variations or dy-
namically using frequency/voltage pre-characterized look-up
tables and provides P- and N-well biasing for threshold scal-
ing.
Features
■ ^{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}
System Diagram
FIGURE 1. System Diagram
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