Datasheet > LP3905

LP3905

更新时间： 2024-11-14 04:19:55

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
15页	681K
描述
Power Management Unit For Low Power Handheld Applications

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LP3905 数据手册

August 2006

LP3905

Power Management Unit For Low Power Handheld

Applications

General Description

Key Specifications

Buck Regulators

LP3905 is

a multi-functional Power Management Unit,

optimized for low power handheld applications. This device

integrates two 600mA DC/DC buck regulators and two

150mA linear regulators. Fixed and adjustable buck output

versions are available. The LP3905 additionally features two

enable pins for the device output control and is offered in an

LLP package.

n Fixed and adjustable voltage options, range 1.0V to

3.3V *

n Up to 90% Efficiency

n Auto-switching PFM-PWM mode and fixed PWM mode

n 2MHz PWM fixed switching frequency (Typ)

n 600mA output current

4% output voltage accuracy over temp.

Features

n Internal softstart

n 2.2µH inductor, 10µF Input and 10µF output Caps

n Two buck regulators for powering high current processor

functions or peripheral devices

Linear Regulators

n Output options in the range 1.5V to 3.3V *

n 13.5µV_rmsoutput voltage noise

n Two linear regulators for powering internal processor

functions and I/Os

n One enable pin for Buck1 and Linear Regulators 1 & 2

n Separate enable pin for Buck2

n PSRR - 70dB 1kHz

3% output voltage accuracy over full line and load

regulation

n Thermal and current overload protection

n Small 14–Pin LLP package (4mm x 4mm x 0.8mm)

n 0mA to 150mA output current

n C_in= 1.0µF, C_out= 0.47µF for 100mA O/P

C_in= 1.0µF, C_out= 1.0µF for 150mA O/P

80mV Dropout voltage

Applications

n Baseband Processors

n Peripheral Processor (Video, Audio)

n I/O Power

* Fixed output voltage devices can be customized to fit

system requirements. Please contact National Semiconduc-

tor Sales Office.

n FPGA Power

Typical Application Circuit

20152901

FIGURE 1. Typical Application Circuit – 14 Pin LLP Package

DS201529

www.national.com

12 3 4 5 6 7...15

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