LP5550 Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – PowerWise Technology Compliant Energy Management Unit

October 2005
LP5550
PowerWise^™ Technology Compliant Energy
Management Unit
General Description
The LP5550 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 LP5550 contains an advanced, digitally controlled
switching regulator for supplying variable voltage to proces-
sor core and memory. The device also incorporates 3 pro-
grammable LDO-regulators for powering I/O, PLLs and
maintaining memory retention in shutdown-mode.
The device is controlled via the PWI open-standard inter-
face. The LP5550 operates cooperatively with PowerWise
technology compatible processors to optimize supply volt-
ages adaptively over process and temperature variations or
dynamically using frequency/voltage pre-characterized
look-up tables.
Features
n Supports high-efficiency PowerWise Technology
Adaptive Voltage Scaling
n PWI open standard interface for system power
management
n Digitally controlled intelligent voltage scaling
n 1 MHz PWM switching frequency
n Auto or PWI controlled PFM mode transition
n Internal soft start/startup sequencing.
n 3 programmable LDOs for I/O, PLL, and memory
retention supply generation.
n Power OK output.
Applications
n GSM/GPRS/EDGE & UMTS cellular handsets
n Hand-held radios
n PDAs
n Battery powered devices
n Portable instruments
System Diagram
FIGURE 1. System Diagram
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