NS LP5552 PWI 2.0低功耗手提设备电源方案

NS公司的LP5552 是PWI 2.0与PowerWise技术兼容的能;量管理单元(EMU),可降低成本低功耗手提设备的功耗. LP5552包括两个先进的数控开关稳压器,为SoC或处理器提供可变电源.器件还包括5个可编低压降低噪音线性稳压器,用来给I/O,外设逻辑区块,辅助系统功能供电,并维持关断模式下存储器的保持力(双域). LP5552输入电压从2.7V到4.8V,输出电压精度在±2%,输出电压0.6V — 1.235V可编程,输出电流达800mA,效率高达88%.主要应用在GSM/GPRS/EDGE 和UMTS 蜂窝手,手持无线电和PDA等.本文介绍了LP5552的主要特性,系统方框图, LP5552评估板电路图和材料清单(BOM).

LP5552: PWI 2.0 and PowerWise  Technology Compliant Energy Management Unit

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 switching 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, peripheral logic blocks, auxiliary system functions, and maintaining 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 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 lookup tables.

LP5552主要特性:
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
应用:
GSM/GPRS/EDGE & UMTS cellular handsets
Hand-held radios
PDAs
Battery-powered devices
Portable instruments



图1.LP5552系统框图
LP5552评估板
The LP5552 Evaluation Board can be operated standalone or from a mainboard such as the PowerWise Evaluation Kit (PEK) or USB2PWI interface board.
The evaluation board ships with the USB2PWI interface board and a graphical user interface (GUI) to easily control the features of the LP5552 from a PC.



图2.LP5552评估板电路图

LP5552评估板材料清单(BOM):