LP5553 Datasheet, PDF (1/44 Pages) National Semiconductor (TI) – PowerWise® AVS Energy Management Unit with SPMI

LP5553
March 5, 2009
PowerWise^® AVS Energy Management Unit with SPMI
General Description
The LP5553 is a System Power Management Interface
(SPMI) compliant Energy Management Unit for reducing pow-
er consumption of low power hand held applications such as
dual-core processors and DSPs.
The LP5553 contains 2 advanced, digitally controlled step-
down DC/DC converters for supplying variable voltages to a
SoC. The device also incorporates 5 programmable low-
dropout, low noise linear regulators for powering I/O, periph-
eral logic blocks, auxiliary system functions, and maintaining
memory retention (dual-domain) in shutdown-mode.
The LP5553 implements 2 Non-Request Capable Slaves that
are controlled via the SPMI. The LP5553 operates coopera-
tively with PowerWise^® AVS technology compatible proces-
sors to optimize supply voltages adaptively (AVS - Adaptive
Voltage Scaling) over process and temperature variations. It
also supports dynamic voltage scaling (DVS) using frequen-
cy/voltage pairs from pre-characterized look-up tables.
Key Specifications
■ ^{2.7 to 4.8V Input Voltage Range}
■ ^{±2% (typical) Output Voltage Range}
Programmable DC/DC Buck Converters
■ ^{800 mA Output Current per DC/DC Converter}
■ ^{Up to 88% Efficiency}
■ ^{Digitally Programmable from 0.6 to 1.235V}
Programmable LDOs
■ ^{Five digitally programmable LDOs}
Features
■ ^{SPMI bus for system-level power management}
■ ^{High-efficiency PowerWise® Technology Adaptive}
Voltage Scaling for intelligent energy management in AVS
and DVS environments
■ ^{Two digitally programmable 3.6 MHz 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}
System Diagram
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