LP5553 Datasheet | National Semiconductor Corporation

- Power Wise® AVS Energy Management Unit with SPMI .. March 5, 2009 Power Wise® AVS Energy Management Unit with SPMI General Description The LP5553 is a System Power Management Interface (SPMI) pliant Energy Management Unit for reducing power consumption of low power hand held applications such as dual-core processors and DSPs. The LP5553 contains 2 advanced, digitally controlled stepdown DC/DC converters for supplying variable voltages to a So C. The device also incorporates 5 programmable lowdropout, low noise linear regulators for powering I/O, peripheral 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 cooperatively with Power Wise® AVS technology patible processors to optimize supply voltages adaptively (AVS - Adaptive Voltage Scaling) over process and temperature variations. It also supports dynamic voltage scaling (DVS) using frequency/voltage pairs from pre-characterized look-up tables. Features - SPMI bus for system-level power management - High-efficiency Power Wise® 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 Key Specifications - 2.7 to 4.8V Input Voltage Range - ±2% (typical) Output Voltage Range Programmable DC/DC Buck Converters - 800 m A Output Current per DC/DC Converter - Up to 88% Efficiency - Digitally Programmable from 0.6 to 1.235V Programmable LDOs - Five digitally programmable LDOs System Diagram © 2009...