Datasheet > LM3880_08

LM3880_08

更新时间： 2024-02-13 10:28:00

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
12页	283K
描述
Power Sequencer

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LM3880_08 数据手册

May 1, 2008

LM3880/LM3880Q

Power Sequencer

General Description

The LM3880 Power Sequencer offers the easiest method to

control power up and power down of multiple power supplies

(switchers 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.

Available in a SOT23-6 package, the Power Sequencer con-

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

Upon enabling the LM3880 the three output flags will sequen-

tially release, after individual time delays, permitting the con-

nected power supplies to startup. The output flags will follow

a reverse sequence during power down to avoid latch condi-

tions.

Features

Easiest method to sequence rails

■

Power up and power down control

Input voltage range of 2.7V to 5.5V

Small footprint SOT23-6

Low quiescent current of 25 µA

Standard timing options available

Customization of timing and sequence available through

factory programmability

LM3880Q is AEC-Q100 Grade 1 qualified and is

manufactured on an Automotive Grade Flow

■

EPROM capability allows every delay and sequence to be

fully adjustable. Contact National Semiconductor if a non-

standard configuration is required.

Applications

Multiple supply sequencing

■

Microprocessor / Microcontroller sequencing

FPGA sequencing

Automotive

■

Typical Application Circuit

20192601

201926

www.national.com

12 3 4 5 6 7...12

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