LP5552 Datasheet, PDF (1/3 Pages) National Semiconductor (TI) – PWI 2.0 and PowerWise™ Technology Compliant Energy Management Unit

ADVANCE INFORMATION
September 2006
LP5552
PWI 2.0 and PowerWise^™ Technology Compliant Energy
Management Unit
General Description
The LP5552 is a PWI 2.0 compliant Energy Management
System for reducing power consumption of stand-alone mo-
bile phone processors such as base-band or applications
processors.
The LP5552 contains two advanced, digitally controlled
switching regulators for supplying variable voltage to proces-
sor core and memory. The device also incorporates 5 pro-
grammable LDO regulators for powering I/O, peripheral logic
blocks, maintaining memory retention (dual-domains) in
shutdown mode, and auxillary functions.
The device is controlled via the PWI 2.0 open-standard
interface. The LP5552 operates cooperatively with Power-
Wise technology compatible processors to optimize supply
voltages adaptively over process and temperature variations
(adaptive voltage scaling) or dynamically using frequency/
voltage pre-characterized look-up tables (dynamic voltage
scaling).
Features
n Two 800 mA buck regulators operate 180 degrees out of
phase for reduced EMI
n 3.6 MHz PWM switching frequency
n Five programmable LDOs ideal for I/O , PLL, and
memory retention supply generation.
n Supports high-efficiency PowerWise Technology
Adaptive Voltage Scaling
n PWI 2.0 open standard interface for system power
management
n Digitally controlled intelligent voltage scaling
n Auto or PWI controlled PFM mode transition
n Internal soft start/startup sequencing.
n Power OK output.
Applications
n Dual core processors
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
© 2006 National Semiconductor Corporation DS202103
20210301
www.national.com