Datasheet > LT3430

LT3430

更新时间： 2024-11-22 22:46:51

品牌	Logo	应用领域
凌特 - Linear		稳压器开关
页数	文件大小	规格书
28页	302K
描述
High Voltage, 3A, 200kHz Step-Down Switching Regulator

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LT3430 数据手册

Final Electrical Specifications

LT3430

High Voltage, 3A,

200kHz Step-Down

Switching Regulator

August 2002

FEATURES

DESCRIPTIO

Wide Input Range: 5.5V to 60V

TheLT^®3430isa200kHzmonolithicbuckswitchingregu-

latorthatacceptsinputvoltagesupto60V.Ahighefficiency

3A,0.1Ωswitchisincludedonthediealongwithallthenec-

essaryoscillator,controlandlogiccircuitry.Acurrentmode

architectureprovidesfasttransientresponseandexcellent

loop stability.

■

3A Peak Switch Current

■

Small Thermally Enhanced 16-Pin TSSOP Package

■

Constant 200kHz Switching Frequency

■

Saturating Switch Design: 0.1Ω

■

Peak Switch Current Maintained Over

Full Duty Cycle Range

Special design techniques and a new high voltage process

achieve high efficiency over a wide input range. Efficiency

ismaintainedoverawideoutputcurrentrangebyusingthe

output to bias the circuitry and by utilizing a supply boost

capacitor to saturate the power switch. Patented circuitry

maintainspeakswitchcurrentoverthefulldutycyclerange.

Ashutdownpinreducessupplycurrentto30µAandaSYNC

pincanbeexternallysynchronizedfrom228kHzto700kHz

with a logic level input.

■

Effective Supply Current: 2.5mA

■

Shutdown Current: 30µA

■

1.2V Feedback Reference Voltage

■

Easily Synchronizable

■

Cycle-by-Cycle Current Limiting

APPLICATIO S

■

Industrial and Automotive Power Supplies

■

The LT3430 is available in a thermally enhanced 16-pin

TSSOP package.

Portable Computers

■

Battery Chargers

Distributed Power Systems

■

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

TYPICAL APPLICATIO

5V, 2A Buck Converter

MMSD914TI

0.68µF

Efficiency vs Load Current

BOOST

22µH

OUT

3, 4

2, 5

5.5V*

100

TO 60V

= 5V

OUT

30BQ060

4.7µF 100V

LT3430

L = 27µH

CERAMIC^†

= 12V

= 42V

100µF 10V

SOLID

TANTALUM

OFF ON

SHDN

BIAS

15.4k

SYNC

GND

4.99k

1, 8, 9, 16

220pF

3.3k

0.022µF

0.5

1.0

1.5

2.0

2.5

LOAD CURRENT (A)

*FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY

^†UNITED CHEMI-CON

3430 TA02

3430 TA01

sn3430 3430is

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

12 3 4 5 6 7...28

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与LT3430相关器件

型号	品牌	获取价格	描述	数据表
LT3430_15	Linear	获取价格	High Voltage, 3A, 200kHz/100kHz Step-Down Switching Regulators
LT3430-1	Linear	获取价格	High Voltage, 3A,200kHz/100kHz Step-Down Switching Regulators
LT3430-1_15	Linear	获取价格	High Voltage, 3A, 200kHz/100kHz Step-Down Switching Regulators
LT3430EFE	Linear	获取价格	High Voltage, 3A, 200kHz Step-Down Switching Regulator
LT3430EFE#TR	Linear	获取价格	LT3430 - High Voltage, 3A, 200kHz Step-Down Switching Regulator; Package: TSSOP; Pins: 16;
LT3430EFE-1	Linear	获取价格	High Voltage, 3A,200kHz/100kHz Step-Down Switching Regulators
LT3430EFE-1#PBF	Linear	获取价格	LT3430 - High Voltage, 3A, 200kHz Step-Down Switching Regulator; Package: TSSOP; Pins: 16;
LT3430EFE-1#TR	Linear	获取价格	IC 6.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO16, 4.40 MM, PLASTIC, TSSOP-
LT3430IFE	Linear	获取价格	High Voltage, 3A, 200kHz Step-Down Switching Regulator
LT3430IFE#TRMPBF	Linear	获取价格	Switching Regulator

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