Datasheet > LP5550SQ

LP5550SQ

更新时间： 2024-11-20 21:53:55

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
25页	1051K
描述
PowerWise Technology Compliant Energy Management Unit

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LP5550SQ 数据手册

October 2005

LP5550

™

PowerWise Technology Compliant Energy

Management Unit

General Description

Features

n Supports high-efficiency PowerWise Technology

Adaptive Voltage Scaling

The LP5550 is a PWI 1.0 compliant Energy Management

System for reducing power consumption of stand-alone mo-

bile phone processors such as base-band or applications

processors.

n PWI open standard interface for system power

management

n Digitally controlled intelligent voltage scaling

n 1 MHz PWM switching frequency

n Auto or PWI controlled PFM mode transition

n Internal soft start/startup sequencing.

n 3 programmable LDOs for I/O, PLL, and memory

retention supply generation.

The LP5550 contains an advanced, digitally controlled

switching regulator for supplying variable voltage to proces-

sor core and memory. The device also incorporates 3 pro-

grammable LDO-regulators for powering I/O, PLLs and

maintaining memory retention in shutdown-mode.

The device is controlled via the PWI open-standard inter-

face. The LP5550 operates cooperatively with PowerWise

technology compatible processors to optimize supply volt-

ages adaptively over process and temperature variations or

dynamically using frequency/voltage pre-characterized

look-up tables.

n Power OK output.

Applications

n GSM/GPRS/EDGE & UMTS cellular handsets

n Hand-held radios

n PDAs

n Battery powered devices

n Portable instruments

System Diagram

20154563

FIGURE 1. System Diagram

DS201545

www.national.com

12 3 4 5 6 7...25

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