Datasheet > LT1436

LT1436

更新时间： 2024-01-05 22:30:19

品牌	Logo	应用领域
凌特 - Linear		稳压器开关
页数	文件大小	规格书
24页	420K
描述
4.5A, 500kHz Step-Down Switching Regulator

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LT1436 数据手册

LT1506

4.5A, 500kHz Step-Down

Switching Regulator

DESCRIPTION

FEATURES

TheLT^®1506isa500kHzmonolithicbuckmodeswitching

regulatorfunctionallyidenticaltotheLT1374butoptimized

for lower input voltage applications. It will operate over a

4V to 15V input range compared with 5.5V to 25V for the

LT1374. A 4.5A switch is included on the die along with all

the necessary oscillator, control and logic circuitry. High

switchingfrequencyallowsaconsiderablereductioninthe

sizeofexternalcomponents.Thetopologyiscurrentmode

for fast transient response and good loop stability. Both

fixed output voltage and adjustable parts are available.

■

Constant 500kHz Switching Frequency

■

Easily Synchronizable

■

Operates with Input as Low as 4V

■

Uses All Surface Mount Components

■

Inductor Size Reduced to 1.8µH

■

Saturating Switch Design: 0.07Ω

Shutdown Current: 20µA

Cycle-by-Cycle Current Limiting

APPLICATIONS

Aspecialhighspeedbipolarprocessandnewdesigntech-

niquesachievehighefficiencyathighswitchingfrequency.

Efficiency is maintained over a wide output current range

by keeping quiescent supply current to 4mA and by utiliz-

ing a supply boost capacitor to saturate the power switch.

■

Portable Computers

■

Battery-Powered Systems

■

Battery Charger

Distributed Power

■

The LT1506 fits into standard 7-pin DD and fused lead

SO-8packages.Fullcycle-by-cycleshort-circuitprotection

and thermal shutdown are provided. Standard surface

mount external parts are used, including the inductor and

capacitors. There is the optional function of shutdown or

synchronization.Ashutdownsignalreducessupplycurrent

to20µA.Synchronizationallowsanexternallogiclevelsig-

naltoincreasetheinternaloscillatorfrom580kHzto1MHz.

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

TYPICAL APPLICATION

Efficiency vs Load Current

= 3.3V

5V to 3.3V Down Converter

OUT

= 5V

L = 10µH

1N914

0.68µF

5µH

OUTPUT

3.3V

BOOST

INPUT

OPEN

HIGH

= ON

LT1506-3.3

10µF TO

50µF

CERAMIC

SHDN

GND

SENSE

100µF, 10V

SOLID

TANTALUM

MBRS330T3

1.5nF

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

LOAD CURRENT (A)

1506 TA01

1506 TA02

12 3 4 5 6 7...24

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