Datasheet > LQA48B

LQA48B

更新时间： 2024-09-24 03:52:15

品牌	Logo	应用领域
美国国家半导体 - NSC		蜂窝电话
页数	文件大小	规格书
32页	780K
描述
Cellular Phone Power Management Unit

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LQA48B 数据手册

May 2004

LP3941A

Cellular Phone Power Management Unit

n Three open drain drivers to control a RGB LED

General Description

n I²C compatible serial interface for maximum flexibility

LP3941A is a complete power management IC designed for

a cellular phone. It contains 11 low noise low dropout regu-

lators, a linear charger for Li-Ion battery, a backup battery

charger, real time clock supply regulator, three open drain

drivers, two comparators and high speed I²C compatible

serial interface to program individual regulator output volt-

ages as well as on/off control.

Applications

n GSM/EDGE cellular handsets

n Wideband CDMA cellular handsets

Key Specifications

n 3.0V to 5.5V Input Voltage Range

n 27 µV_RMSOutput noise

n 2% (typical) Output Voltage Accuracy

n 1% Charger Voltage Accuracy

LP3941 is available in a LLP48 package.

Features

n 11 low dropout, low noise LDOs.

n Dedicated low current LDO for real time clock supply.

n Back-up battery charger

n A constant current / constant voltage battery charger

controller with charge status indication via I²C

compatible interface.

Typical Application

20094501

DS200945

www.national.com

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