LP3917RL-QL

更新时间： 2024-11-15 04:08:07

品牌	Logo	应用领域
美国国家半导体 - NSC		手机
页数	文件大小	规格书
6页	181K
描述
CDMA Cellular Phone Power Management Unit

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中文翻译

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数据手册

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LP3917RL-QL 数据手册

December 2006

LP3917

CDMA Cellular Phone Power Management Unit

General Description

Features

LP3917 is a complete Power Management Unit designed for

CDMA cellular phones. LP3917 PMU contains 9 low noise low

dropout voltage regulators, 2 buck regulators, an USB

Transceiver, two comparators and a high speed serial inter-

face to program on/off conditions and output voltages of

individual regulators, and to read status information of the

PMU.

Two high efficiency Synchronous Magnetic Buck

Regulators, I_OUT800 mA and 600 mA

High efficiency PFM mode @ low I_OUT

Auto Mode PFM/PWM switch

■

Low inductance 2.2 uH @ 2 MHz clock

■

9 Low Noise LDO's

3 x 300 mA

Buck regulators have an automatic switch to PFM mode at

low load conditions allowing very good efficiency also at low

output currents.

5 x 150 mA

1 x 80 mA

SW controllable LDO outputs

■

LDO regulators provide very low noise, 35 uV typ, ideally suit-

ed for supplying voltage to RF section.

USB 2.0 compatible Transceiver (12 Mbps)

Thermal Shutdown with Early Warning Alarm

Very low Sleep mode current

Two comparators can be used for detecting external acces-

sories like ear plug etc.

Battery Voltage Monitor output

LP3917 can use interrupt for alerting BB processor of status

changes instead of using inefficient status polling.

Interrupt Request for reducing SW polling

Ultra small 3.5x3.5 mm Micro SMDxt 49 bump package

Key Specifications

Applications

3.0V to 5.5V Input Voltage Range

■

CDMA Handsets

170 mV typ Dropout Voltage on LDO's @ 300 mA

2% (typ) Output Voltage accuracy on LDO's

35 µV noise on LDO's

■

Please contact NSC Sales for a full datasheet for the device.

800/600 mA Buck regulators with 3% (typ)

Accuracy and up to 90% efficiency

System Diagram

20176201

201762

www.national.com

12 3 4 5 6

中文翻译

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