LM3350

更新时间： 2024-11-08 22:51:55

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器开关
页数	文件大小	规格书
8页	247K
描述
Switched Capacitor Voltage Converter

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数据手册

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LM3350 数据手册

December 1999

LM3350

Switched Capacitor Voltage Converter

n 4.2Ω typical step-up output impedance

n 1.8Ω typical step-down output impedance

n 90% typical power conversion efficiency at 50 mA

n 250 nA typical shutdown current

General Description

The LM3350 is a CMOS charge-pump voltage converter

which efficiently provides a 3.3V to 5V step-up, or 5V to 3.3V

step-down. The LM3350 uses four small, low cost capacitors

to provide the voltage conversion. It eliminates the cost, size

and radiated EMI related to inductor based circuits, or the

power loss of a linear regulator. Operating power conversion

efficiency greater than 90% provides ideal performance for

battery powered portable systems.

Features

n Conversion of 3.3V to 5V, or 5V to 3.3V

n Small Mini SO-8 package

n No inductor required

The architecture provides a fixed voltage conversion ratio of

3/2 or 2/3. Thus it can be used for other DC-DC conversions

as well.

Applications

n Any mixed 5V and 3.3V system

n Laptop computers and PDAs

n Handheld instrumentation

n PCMCIA cards

Key Specifications

n 800 kHz switch frequency allows use of very small,

inexpensive capacitors.

Ordering Information

NSC Package

Package

Order Number

Package Type

Supplied As

Marking

Drawing

MUA08A

LM3350MMX

LM3350MM

Mini SO-8

S00A

3500k Units on Tape and Reel

1000 Units on Tape and Reel

Basic Operating Circuits

Step-Up Converter

Step-Down Converter

DS100002-1

DS100002-2

Connection Diagram

Mini SO8 Package

DS100002-3

Top View

DS100002

www.national.com

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