Datasheet > LM3881

LM3881

更新时间： 2024-09-09 04:44:19

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
14页	242K
描述
Power Sequencer

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LM3881 数据手册

February 6, 2008

LM3881

Power Sequencer

General Description

The LM3881 Power Sequencer offers the easiest method to

control power up and power down of multiple power supplies

(switching or linear regulators). By staggering the startup se-

quence, it is possible to avoid latch conditions or large in-rush

currents that can affect the reliability of the system.

Features

Easiest method to sequence rails

■

Power up and power down control

Input voltage range of 2.7V to 5.5V

Small footprint MSOP-8 package

Low quiescent current of 80 µA

Available in MSOP-8 package, the Power Sequencer con-

tains a precision enable pin and three open drain output flags.

Upon enabling the LM3881, the three output flags will se-

quentially release, after individual time delays, permitting the

connected power supplies to startup. The output flags will fol-

low a reverse sequence during power down to avoid latch

conditions. Time delays are defined using an external capac-

itor and the output flag states can be inverted by the user.

Output invert feature

Timing controlled by small value external capacitor

Applications

Multiple Supply Sequencing

■

Microprocessor / Microcontroller Sequencing

FPGA Sequencing

Typical Application Circuit

30048401

300484

www.national.com

12 3 4 5 6 7...14

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与LM3881相关器件

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LM3881MM/NOPB	TI	获取价格	LM3881 Simple Power Sequencer With Adjustable Timing
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LM3881MME/NOPB	TI	获取价格	暂无描述
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LM3881MMX	TI	获取价格	LM3881 Power Sequencer