LP5552_08 Datasheet, PDF (1/36 Pages) National Semiconductor (TI) – PWI 2.0 and PowerWise Technology Compliant Energy Management Unit

May 20, 2008
LP5552
PWI 2.0 and PowerWise^® Technology Compliant Energy
Management Unit
General Description
The LP5552 is a PWI™ 2.0 compliant Energy Management
Unit (EMU) for reducing power consumption in low-power,
portable applications.
The LP5552 contains 2 advanced, digitally controlled switch-
ing regulators for supplying variable voltages to a SoC or
processor. The device also incorporates 5 programmable
low-dropout, low-noise linear regulators for powering I/O, pe-
ripheral logic blocks, auxiliary system functions, and main-
taining memory retention (dual-domains) in shutdown-mode.
The device is controlled via the high-speed serial PWI 2.0
open-standard interface. The LP5552 operates cooperatively
with PowerWise^® technology-compatible processors to opti-
mize supply voltages adaptively (AVS - Adaptive Voltage
Scaling) over process and temperature variations. It also sup-
ports dynamic voltage scaling (DVS) using frequency/voltage
pairs from pre-characterized lookup tables.
Key Specifications
• 2.7V to 4.8V Input Voltage Range
• ±2% (typical) Output Voltage Accuracy
Programmable DC/DC Buck Converters
• 800mA Output Current per Switcher
• Up to 88% Switcher Efficiency
• Digitally programmable from 0.6V — 1.235V
Programmable LDOs
• Five digitally programmable LDOs
Features
■ ^{High-efficiency PowerWise Technology Adaptive Voltage}
Scaling for intelligent energy management in AVS and
DVS environments
■ ^{PWI 2.0 open standard interface for system-level power}
management
■ ^{Two digitally programmable 3.6MHz buck regulators to}
power dual-voltage domains
■ ^{Five programmable LDOs for system functions such as:}
— PLL/Clock Generation
— I/O
— Memory Retention
■ ^{Internal soft start}
■ ^{Variable regulator power up sequencing}
Applications
■ ^{GSM/GPRS/EDGE & UMTS cellular handsets}
■ ^{Hand-held radios}
■ ^PDAs
■ ^{Battery-powered devices}
■ ^{Portable instruments}
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