Datasheet > 3745SN

3745SN

更新时间： 2024-09-26 02:58:47

品牌	Logo	应用领域
凌特 - Linear		稳压器开关
页数	文件大小	规格书
32页	297K
描述
4.5A, 500kHz Step-Down Switching Regulator

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中文翻译

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数据手册

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3745SN 数据手册

LT1374

4.5A, 500kHz Step-Down

Switching Regulator

FEATURES

DESCRIPTIO

■

Constant 500kHz Switching Frequency

TheLT^®1374isa500kHzmonolithicbuckmodeswitching

regulator. A 4.5A switch is included on the die along with

allthenecessaryoscillator,controlandlogiccircuitry.High

switchingfrequencyallowsaconsiderablereductioninthe

sizeofexternalcomponents.Thetopologyiscurrentmode

for fast transient response and good loop stability. Both

fixed output voltage and adjustable parts are available.

■

High Power 16-Pin TSSOP Package Available

■

Uses All Surface Mount Components

Inductor Size Reduced to 1.8µH

■

Saturating Switch Design: 0.07Ω

Effective Supply Current: 2.5mA

Shutdown Current: 20µA

Cycle-by-Cycle Current Limiting

Easily Synchronizable

Aspecialhighspeedbipolarprocessandnewdesigntech-

niquesachievehighefficiencyathighswitchingfrequency.

Efficiency is maintained over a wide output current range

by using the output to bias the circuitry and by utilizing a

supply boost capacitor to saturate the power switch.

APPLICATIO S

■

Portable Computers

TheLT1374isavailableinstandard7-pinDD,TO-220,fused

lead SO-8 and 16-pin exposed pad TSSOP packages. Full

cycle-by-cycle short-circuit protection and thermal shut-

downareprovided.Standardsurfacemountexternalparts

may be used, including the inductor and capacitors. There

is the optional function of shutdown or synchronization. A

shutdownsignalreducessupplycurrentto20µA.Synchro-

nizationallowsanexternallogiclevelsignaltoincreasethe

■

Battery-Powered Systems

■

Battery Chargers

Distributed Power

■

internal oscillator from 580kHz to 1MHz.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

5V Buck Converter

Efficiency vs Load Current

100

CMDSH3 OR FMMD914

= 5V

OUT

= 10V

L = 10µH

0.27µF

L1**

5µH

BOOST

OUTPUT**

5V, 4.25A

INPUT

6V TO 25V

C3*

LT1374-5 BIAS

10µF TO

50µF

DEFAULT

= ON

SHDN

SENSE

GND

100µF, 10V

SOLID

MBRS330T3

1.5nF

TANTALUM

* RIPPLE CURRENT RATING ≥ I /2

OUT

1374 TA01

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

LOAD CURRENT (A)

** INCREASE L1 TO 10µH FOR LOAD CURRENTS ABOVE 3.5A AND TO 20µH ABOVE 4A

SEE APPLICATIONS INFORMATION

1374 TA02

1374fb

12 3 4 5 6 7...32

中文翻译

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